Mayhaw Propagation and Management

Total Page:16

File Type:pdf, Size:1020Kb

Mayhaw Propagation and Management Fire Blight is a bacterial infection that is easily spread Purchasing locally adapted cultivars developed from by bees. There is no cure for it once it is established. wild Mayhaws such as ‘Maxine’ are recommended The bacteria that causes it, propagates around freshly over making wild collections. These cultivars have a cut limbs and injuries. Treat with copper fungicides or known level of performance and reduce issues of dis- Streptomycin to prevent spread of bacteria. Strepto- ease and frost damage. They are uniform in growth mycin can be found in products such as Agri-Mycin and and will create a much more productive nursery. May- Bonide Fire Blight Spray. Copper fungicides include Tri haw seeds hold true to the tree that it came from, so -Basic Copper Sulfate and Kocide. There are also re- expansion of the orchard is possible through collected sistant cultivars such as Hope 13 and Maxine. seed and cuttings from purchased material. Quince Rust is a fungal infection that creates powdery rust like lesions on leaves and fruit. Trees should be treated with a broad-spectrum fungicide when in Find a location for the orchard with suitable soils bloom to prevent fungal infections and fruit loss. that is near a water source and electricity, if possible, Products such as Rally and Immunox Multipurpose in Spring of 2020. Fungicide will control this disease. It is harbored in Lay out orchard and plant purchased trees. Fertilize eastern red cedars and may be prevalent where these at planting with slow release fertilizer and water trees are near Mayhaws. trees in to seal off the roots, May-June 2020. Deer and rabbits will browse and destroy young trees. Irrigate as needed through the summer to maintain Containerized plants should be fenced to protect them growth, Summer 2020. Species Information Soils from browse damage. Common insect pests include Make cutting from purchased trees in the following plum curculio, aphids, flat-headed apple borer, white spring after they have started to put on leaves and Western mayhaw, crataegus opaca, is Mayhaws will tolerate wet and very flies, and foliage feeders. Plum curculio, if present, root them in growth media, Spring 2021. a small deciduous tree that grows in acidic soils. Wild mayhaws are typi- may require an insecticide application program to Move the rooted material to the High Tunnel House the forests of the southeastern United cally found in low flooded areas and prevent extensive damage to the crop. to promote rapid growth, April-March 2021. States. Reaching 30 feet in height along creek banks, but flooding is not Transplant to the field when root bound in contain- with trunks approximately 8 inches in required to cultivate trees and produce ers, May-June 2021. diameter, they are typically found in fruit. Continue process until orchard reaches desired size. low areas that receive periodic flood- Mayhaws ripen from mid-April to early May depending ing or partial shading. They are mem- For optimal growth Mayhaws require on the tree. In pond or swampy areas, Mayhaws may USDA Natural Resources Conservation Service bers of the Hawthorne family and full sun with moist, well drained soils be scooped off the water with fine meshed nets. with a pH of 6-6.5. Soil testing is re- Ponded areas are not required for production and a 101 S. Main Street come with or without thorns. White blooms appear in late February or ear- quired to determine soil pH and nutri- bed sheet or tarp spread under the tree works well for Temple, Texas 76501 collecting fruit that falls from the trees either naturally ly March and produce small, red to or- ent levels. 254-742-9800 or by vibration. Fruit is subject to sun scalding and be- ange, crabapple like fruits toward the gins to rot quickly when in contact with the ground or _________________________________________ end of April and the beginning of May. For soil testing requests, please impermeable membranes, such as plastic tarps. Some East Texas Plant Materials Center The fruit is used to make tart jellies, contact Pittman Labs at 936-645-3276 or Steven F. Austin State trees will hold fruit longer than others, and ripe berries 6598 FM 2782 syrups, and juices that are highly may be picked straight from the tree. University Soils Lab at 936 468-4500. Nacogdoches, Texas 75964 prized. 936-564-4873 *Pictured above are the Mayhaw trees ready for harvest at LSU AgCenter. Natural Resources USDA is an equal opportunity provider, 936-552-7924 (Fax) Conservation employer, and lender. Service shaking. It is very Fire Blight resistant and is considered the best tree taken from the wild There are many commercial cultivars of trees by many producers. Plant cuttings in a small container with well Trees should be pruned to resemble an upside- available with many different attributes. Some are drained potting mix. down umbrella with cutting being done in winter heavy fruit producers, some hold fruit longer, Double G: A cross of Texas Star and Royal Star, Cover the containers with a plastic bag or and early spring before blooming. Some cultivars some are more disease resistant, and some pro- the fruit is dark red with red pulp. This variety some other covering that will allow transfer such as Maxine and Double G require little to no duce exceptionally large fruit. An internet search requires no manual shaping via pruning. It of light and maintain high humidity. There pruning to achieve desired growth forms. Cut out can reveal a lot of information on cultivars availa- produces fruit at an earlier age than other cul- are many commercially available trays for limbs that cross over one another and also cut tivars. It blooms around March 10th. It holds ble from various nurseries. When selecting culti- this process available. out any limbs that are lower than about 4 feet fruit well but has some susceptibility to fire vars avoid early blooming varieties as they will en- Place potted cuttings in indirect lighting as from the ground. blight. direct sunlight will scorch plants in the plas- counter freeze damage and crop loss in East Tex- tic containers. A greenhouse heating pad as. Red Champ: A hybrid of Maxine and Double G, under the pots will expedite rooting. Many cultivars have been produced from cuttings it has good fire blight resistance. It is a heavy Check frequently for rooting and transplant Annual application of 5-10-10 at a rate of one or seed from superior wild trees in East Texas and producing cultivar with large, dark red fruit. It to larger containers once root growth has pound per inch of trunk should be applied to ma- western Louisiana. These would make excellent blooms around March 15th and will release ture trees in February or early March. Another established. Containers may then be nursery stock and some of the top choices include: about 95% of its fruit with a single shaking. application can be made in August through Sep- moved to a greenhouse, shade house, or tember if trees are not growing vigorously. Make other protected area until ready to plant in Maxine: Originated from a tree located in De- certain there is adequate water via rainfall or irri- an orchard. Ridder, LA. It is a very late bloomer which re- gation during the late summer application of fer- duces freeze damage crop losses. Blooming tilizer to prevent leaf scorching. One-year old Mayhaws cuttings may also be grafted to existing trees should receive a ½ pound of 5-10-10 in Feb- typically occurs around March 20th. It has an root stock or other hawthorne root stock. Parsley ruary and ¼ pound of 5-10-10 in March and May. excellent natural tree shape and requires little hawthorns accepts grafts from mayhaw readily. Fertilizer should be broadcast evenly under the pruning. It is a heavy producer that holds fruit There are many types of plant grafts, and the pro- drop zone of trees and do not apply fertilizer well and will release 95% of the fruit with one cess requires some specialized tools. Timing is within 8 inches of the trunk. Seedlings in contain- critical and should be done to root stock in spring ers will benefit from light applications of Osmo- as it starts to show new growth. An excellent cote every few months. planted in early spring. Ripe fruit may be planted write up and video on grafting fruit trees can be Mayhaws can be grown from seed, root and stem in containers and left outside to over winter and cuttings, or by grafting onto a rootstock. Trees stratify naturally but is less reliable. found at: https://www.mossyoak.com/our- bloom between February and March and set fruit obsession/blogs/how-to/step-by-step-guide-to- Mayhaws require moist soils and need irrigation. Soft wood cuttings may be rooted by taking in late April and early May. Ripe fruit can be har- grafting-fruit-trees Drought periods will stress trees and reduce their cuttings from new growth of existing trees. vested for seed. Seed viability varies greatly be- productivity. Young trees are susceptible to loss Cuttings should be about 6 inches in length and tween trees, but unlike many fruit trees, the seed- and damage from dry periods and require ade- lings hold true to the characteristics of the tree will included some of the following steps: quate moisture to develop strong, deep roots. they were produced from. Propagation by seed is Remove all but the top two leaves and cut Mayhaws are long lived and may reach 30 feet in Drip emitters placed at every tree are an excel- slow.
Recommended publications
  • May Hawthorn Plant Fact Sheet
    Plant Fact Sheet white flowers, attractive foliage and ability to adapt to a MAY HAWTHORN variety of sites. Crataegus aestivalis Walt. Plant Symbol = CRAE Status Please consult the PLANTS Web site and your State Department of Natural Resources for this plant’s current status (e.g., threatened or endangered species, state noxious status, and wetland indicator values). Description and Adaptation Description: A member of the Rosaceae family, the May Hawthorn is a deciduous, small, round- topped tree growing to 30 feet in height. Leaves are dark green, simple, and are alternately arranged.. Flowers are white and produced either singly or in clusters of 2 or 3.The fruit is a fleshy, red pome borne in May, contributing to the common name “Mayhaw”. Twigs are brown to gray Contributed by: East Texas Plant Materials Center and spiny. Alternative Names Eastern May Hawthorn, Apple May Hawthorn, Summer Haw and Mayhaw Uses Food: The fruit is frequently used for preserves and jellies and can also be dried for later use. Erosion control: Can be used in shelter belts and stream- bank stabilization. Wildlife: Provides nesting sites and cover for small birds. Birds and small mammals eat the fruit. Whitetail deer browse the leaves and young stems. May Hawthorn distribution from USDA-NRCS PLANTS Database. Timber: Adaptation: While preferring full sun, Eastern May The wood is heavy and strong but is too small for Hawthorn will tolerate partial shade. Once established it commercial use. Eastern May Hawthorn wood is used will also tolerate wet soils and drought conditions. It will locally for tool handles and mallets.
    [Show full text]
  • Diseases of Trees in the Great Plains
    United States Department of Agriculture Diseases of Trees in the Great Plains Forest Rocky Mountain General Technical Service Research Station Report RMRS-GTR-335 November 2016 Bergdahl, Aaron D.; Hill, Alison, tech. coords. 2016. Diseases of trees in the Great Plains. Gen. Tech. Rep. RMRS-GTR-335. Fort Collins, CO: U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station. 229 p. Abstract Hosts, distribution, symptoms and signs, disease cycle, and management strategies are described for 84 hardwood and 32 conifer diseases in 56 chapters. Color illustrations are provided to aid in accurate diagnosis. A glossary of technical terms and indexes to hosts and pathogens also are included. Keywords: Tree diseases, forest pathology, Great Plains, forest and tree health, windbreaks. Cover photos by: James A. Walla (top left), Laurie J. Stepanek (top right), David Leatherman (middle left), Aaron D. Bergdahl (middle right), James T. Blodgett (bottom left) and Laurie J. Stepanek (bottom right). To learn more about RMRS publications or search our online titles: www.fs.fed.us/rm/publications www.treesearch.fs.fed.us/ Background This technical report provides a guide to assist arborists, landowners, woody plant pest management specialists, foresters, and plant pathologists in the diagnosis and control of tree diseases encountered in the Great Plains. It contains 56 chapters on tree diseases prepared by 27 authors, and emphasizes disease situations as observed in the 10 states of the Great Plains: Colorado, Kansas, Montana, Nebraska, New Mexico, North Dakota, Oklahoma, South Dakota, Texas, and Wyoming. The need for an updated tree disease guide for the Great Plains has been recog- nized for some time and an account of the history of this publication is provided here.
    [Show full text]
  • Managing Fire Blight by Choosing Decreased Host Susceptibility Levels and Rootstock Traits , 2020 , January 15 January
    Managing Fire Blight by Choosing Decreased Host Susceptibility Levels and Rootstock Traits , 2020 , January 15 January Awais Khan Plant Pathology and Plant-microbe Biology, SIPS, Cornell University, Geneva, NY F ire blight bacterial infection of apple cells Khan et al. 2013 Host resistance and fire blight management in apple orchards Host resistance is considered most sustainable option for disease management due to Easy to deploy/implement in the orchards Low input and cost-effective Environment friendly No choice to the growers--most of the new and old cultivars are highly susceptible Apple breeding to develop resistant cultivars Domestication history of the cultivated apple 45-50 Malus species-----Malus sieversii—Gene flow Malus baccata Diameter: 1 cm Malus sieversii Malus baccata Diameter: up to 8 cm Malus orientalis Diameter: 2-4 cm Malus sylvestris Diameter: 1-3 cm Duan et al. 2017 Known sources of major/moderate resistance to fire blight to breed resistant cultivars Source Resistance level Malus Robusta 5 80% Malus Fusca 66% Malus Arnoldiana, Evereste, Malus floribunda 821 35-55% Fiesta, Enterprise 34-46% • Fruit quality is the main driver for success of an apple cultivar • Due to long juvenility of apples, it can take 20-25 years to breed resistance from wild crab apples Genetic disease resistance in world’s largest collection of apples Evaluation of fire blight resistance of accessions from US national apple collection o Grafted 5 replications: acquired bud-wood and rootstocks o Inoculated with Ea273 Erwinia amylovora strain
    [Show full text]
  • Tree Diseases
    Tree Diseases In North Texas home owners cherish their trees for their beauty and for their shade protection from summer’s sun. Unfortunately, trees can experience problems that affect their attractive appearance and may even lead to death. Trees are vulnerable to environmental stress, infectious diseases, insects and human-caused damage. Correctly diagnosing the cause of a tree’s problem is the most important step in successful treatment. To determine if your tree has a disease, examine the whole tree not just the area showing symptoms suggests Iowa State University Extension Service (Diagnosing Tree Problems). Check leaves for holes or ragged edges, discoloration or deformities Look at the tree’s trunk for damage to the bark such as cracks or splits Consider previous activity that may have impacted the tree’s root system such as planting shrubs nearby or construction of a sidewalk or adding hardscape like a deck or patio The following diseases occur in Denton County. This is not all-inclusive, but Master Gardeners have seen all of these (with the exception of oak wilt). If you need help diagnosing a tree problem, send a picture of the entire tree and close-ups of the problem area(s) to the help desk at [email protected]. If it is a new tree, include a picture of the bottom of the trunk where it meets the soil. Include such information as: Age of the tree When the problem was noticed Sudden or gradual onset Presence of insects Anything else you believe is relevant Anthracnose This fungus is usually on lower branches, following a cool, wet, spring.
    [Show full text]
  • Fire Blight of Apple and Pear
    WASHINGTON STATE UNIVERSITY EXTENSION Fire Blight of Apple and Pear Updated by Tianna DuPont, WSU Extension, February 2019. Original publication by Tim Smith, Washington State University Tree Fruit Extension Specialist Emeritus; David Granatstein, Washington State University; Ken Johnson, Professor of Plant Pathology Oregon State University. Overview Fire blight is an important disease affecting pear and apple. Infections commonly occur during bloom or on late blooms during the three weeks following petal fall. Increased acreage of highly susceptible apple varieties on highly susceptible rootstocks has increased the danger that infected blocks will suffer significant damage. In Washington there have been minor outbreaks annually since 1991 and serious damage in about 5-10 percent of orchards in 1993, 1997, 1998, 2005, Figure 2 Bloom symptoms 12 days after infection. Photo T. DuPont, WSU. 2009, 2012, 2015, 2016, 2017 and 2018. Shoot symptoms. Tips of shoots may wilt rapidly to form a Casual Organism “shepherd’s crook.” Leaves on diseased shoots often show blackening along the midrib and veins before becoming fully Fire blight is caused by Erwinia amylovora, a gram-negative, necrotic, and cling firmly to the host after death (a key rod-shaped bacterium. The bacterium grows by splitting its diagnostic feature.) Numerous diseased shoots give a tree a cells and this rate of division is regulated by temperature. Cell burnt, blighted appearance, hence the disease name. division is minimal below 50 F, and relatively slow at air temperatures between 50 to 70 F. At air temperatures above 70 F, the rate of cell division increases rapidly and is fastest at 80 F.
    [Show full text]
  • PG-Native Mayhaw
    Plant Guide buildings. It is excellent for environmental plantings, MAY HAWTHORN including small specimen tree and shrub borders. Crataegus aestivalis Walt. Status Plant Symbol = CRAE Please consult the PLANTS Web site and your State Department of Natural Resources for this plant’s Contributed By: USDA NRCS National Plant Data current status, such as, state noxious status and Center wetland indicator values. Description General: It is a spiny tree that grows to forty feet high and fifteen inches DBH. Leaves are narrow, broadest above or near the middle, dark green and shiny, serrated, seldom lobed and smooth. Flowers are white, produced singly or in two or three flowered clusters. Fruits are broadest above the middle or rounded, and red in color. Distribution: May hawthorn grows on the outer coastal plain from North Carolina to Mississippi. For current distribution, please consult the plant profile page for this species on the PLANTS Web site. Adaptation Although it will succeed in partial shade and different soil types, it grows best in full sunlight, well-drained loamy soils. May hawthorn will tolerate wet soils becoming drought tolerant once established. It is wind tolerant making it a good tree species in shelterbelt planting. It is also tolerant of atmospheric pollution and performs well in urban settings. It is R. Mohlenbrock commonly found in river swamps, pond areas, and USDA, NRCS, Wetland Sciences Institute stream banks. @ PLANTS Uses Establishment Erosion Control: Because it tolerates a wide variety Propagation from Seed or Grafting: May hawthorn of sites, it can be planted to stabilize banks, for can be propagated by either seeds or grafting.
    [Show full text]
  • Cherry Fire Blight
    ALABAMA A&M AND AUBURN UNIVERSITIES Fire Blight on Fruit Trees and Woody Ornamentals ANR-542 ire blight, caused by the bac- Fterium Erwinia amylovora, is a common and destructive dis- ease of pear, apple, quince, hawthorn, firethorn, cotoneaster, and mountain ash. Many other members of the rose plant family as well as several stone fruits are also susceptible to this disease (Table 1). The host range of the Spur blight on crabapple fire blight pathogen includes cv ‘Mary Potter’. nearly 130 plant species in 40 genera. Badly diseased trees and symptoms are often referred to shrubs are usually disfigured and as blossom blight. The blossom may even be killed by fire blight phase of fire blight affects blight. different host plants to different degrees. Fruit may be infected Symptoms by the bacterium directly through the skin or through the The term fire blight describes stem. Immature fruit are initially Severe fire blight on crabapple the blackened, burned appear- water-soaked, turning brownish- cv ‘Red Jade’. ance of damaged flowers, twigs, black and becoming mummified and foliage. Symptoms appear in as the disease progresses. These Shortly after the blossoms early spring. Blossoms first be- mummies often cling to the trees die, leaves on the same spur or come water-soaked, then wilt, for several months. shoot turn brown on apple and and finally turn brown. These most other hosts or black on Table 1. Plant Genera That Include Fire Blight Susceptible Cultivars. Common Name Scientific Name Common Name Scientific Name Apple, Crabapple Malus Jetbead Rhodotypos
    [Show full text]
  • Comparative Efficacy and Quality Characterizatin of Mayhaw (Crataegus Opaca) Juice Extraction
    Louisiana State University LSU Digital Commons LSU Historical Dissertations and Theses Graduate School 2000 Comparative Efficacy and Quality Characterizatin of Mayhaw (Crataegus Opaca) Juice Extraction. Alfred Francois Trappey II Louisiana State University and Agricultural & Mechanical College Follow this and additional works at: https://digitalcommons.lsu.edu/gradschool_disstheses Recommended Citation Trappey, Alfred Francois II, "Comparative Efficacy and Quality Characterizatin of Mayhaw (Crataegus Opaca) Juice Extraction." (2000). LSU Historical Dissertations and Theses. 7304. https://digitalcommons.lsu.edu/gradschool_disstheses/7304 This Dissertation is brought to you for free and open access by the Graduate School at LSU Digital Commons. It has been accepted for inclusion in LSU Historical Dissertations and Theses by an authorized administrator of LSU Digital Commons. For more information, please contact [email protected]. INFORMATION TO USERS This manuscript has baen reproduced from the microfilm master. UMI films the text directly from the original or copy submitted. Thus, some thesis and dissertation copies are in typewriter face, while others may be from any type of computer printer. The quality of this reproduction is dependent upon the quality of the copy submitted. Broken or indistinct print, colored or poor quality illustrations and photographs, print bleedthrough, substandard margins, and improper alignment can adversely affect reproduction. In the unlikely event that the author did not send UMI a complete manuscript and there are missing pages, these will be noted. Also, if unauthorized copyright material had to be removed, a note will indicate the deletion. Oversize materials (e.g., maps, drawings, charts) are reproduced by sectioning the original, beginning at the upper left-hand comer and continuing from left to right in equal sections with small overlaps.
    [Show full text]
  • Fireblight–An Emerging Problem for Blackberry Growers in the Mid-South
    North American Bramble Growers Research Foundation 2016 Report Fire Blight: An Emerging Problem for Blackberry Growers in the Mid-South Principal Investigator: Burt Bluhm University of Arkansas Department of Plant Pathology 206 Rosen Center Voice: (479) 575-2677 Fax: (479) 575-7601 Julia Stover University of Arkansas Department of Plant Pathology 211 Rosen Center A poster with many of these initial findings was presented at the North American Berry Conference in Grand Rapids, MI in December 2016 Background and Initial Rationale: Fire blight, caused by the bacterial pathogen Erwinia amylovora, infects all members of the family Rosaceae and is considered to be the single most devastating bacterial disease of apple. Erwinia amylovora was first isolated from blighted blackberry plants in Illinois in 1976, from both mummified fruit and blighted canes (Ries and Otterbacher, 1977). These symptoms had been sporadically reported previously in both blackberry and raspberry, but the causal agent had never been identified. Since this first report, the disease has been found throughout the blackberry growing regions of the United States, but is generally not considered to be a pathogen of major concern (Smith, 2014; Clark, personal communication). However, with the advent of primocane fruiting plants, a significant increase in disease incidence has been witnessed in Arkansas (Garcia, personal communication) and fruit loss of up to 65% has been reported in Illinois (Schilder, 2007). Fire blight is a disease that is very environmentally dependent, and warm, wet weather at flowering is most conducive to serious disease development. The Arkansas growing conditions are ideal for disease development, and the shift in production season with primocane fruiting moves flowering time to a time of year with temperatures cool enough for bacterial growth (Smith, 2014).
    [Show full text]
  • Home Orchards Disease and Insect Control Recommendations
    INTEGRATED PEST MANAGEMENT Home Orchards Disease and Insect Control Recommendations Apple and Pear Apple and pear trees are subject to serious damage from pests. As a result, a preventive spray program is needed. The following practices will improve the effectiveness of the pesticides and may lessen the need for sprays. ■ Plant disease-resistant varieties. This method of disease control is especially important for fire blight, where chemical control options are limited. Varieties resistant to cedar-apple rust, scab, and powdery mildew also are available and will potentially reduce the need for sprays. ■ Rake and destroy leaves in the fall if apple scab or pear leaf spot are problems. The fungi that cause these diseases can survive through the winter in ■ Prune out and destroy all dead or diseased shoots infected leaves. and limbs during the dormant season. This helps to reduce fire blight, fruit rots, and certain leaf spots, ■ Remove diseased galls from cedar trees. Spores as the organisms that cause these diseases can from these cedars can infect apples, causing cedar- survive through the winter in the wood. Removing apple rust. Elimination of the source of spores (cedar mummified (dark, shriveled, dry) fruit helps to prevent trees) is effective but not always possible. Where the overwintering of the fruit rot organisms. cedars are part of an established landscape, remove and destroy all galls caused by the rust fungus on ■ Prune out fire blight–affected shoots and blossom cedars in the late fall. Inspect the cedars again in clusters during the growing season only as symptoms the early spring during or just after a rain when the appear.
    [Show full text]
  • Fire Blight of Pears and Apples,” Utah Plant Disease Control No
    UtahUtah Pest Factsheet Published by Utah State University Extension and Utah Plant Pest Diagnostic Laboratory PLP-009 June 2008 Adapted from “Fire Blight of Pears and Apples,” Utah Plant Disease Control No. 27, Revised 2000. Fire Blight Kent Evans, Extension Plant Pathology Specialist been found in all pear and apple-producing areas Erin Frank, USU Plant Disease Diagnostician in the United States, as well as in New Zealand and Taun Beddes, Cache County Extension Agent Europe. Erwinia amylovora has the ability to infect many Mike Pace, Box Elder County Extension Agent ornamental plants of the rose family, but is particularly Maggie Shao, Salt Lake County Extension Agent important on pear and apple. It not only destroys the Alicia Moulton, Wasatch County Extension Agent current season’s crop, but may damage the structure of the tree and reduce subsequent production. Highly What You Should Know susceptible trees may be killed in a single season. Fire blight is a bacterial disease of rosaceous plants. Economically, it is most serious on pears and apples. Symptoms The bacterium that causes fire blight, Erwinia amylovora, can be spread by insects, contaminated pruning or graft- Fire blight symptoms are easily recognized by the ing tools, infected grafts, and any manner that carries scorched appearance of leaves, blossoms, and young the bacterial pathogen from an infected plant to one that terminal shoots. Initial infection causes wilt; infected tis- is not, including wind and rain-splash. Pear and apple sue and tissue outward of infections turns black on pear are most susceptible at flowering, but actively growing and brown on apple.
    [Show full text]
  • Crataegus (Hawthorn)
    nysipm.cornell.edu 2019 Search for this title at the NYSIPM Publications collection: ecommons.cornell.edu/handle/1813/41246 Disease and Insect Resistant Ornamental Plants Mary Thurn, Elizabeth Lamb, and Brian Eshenaur New York State Integrated Pest Management Program, Cornell University CRATAEGUS Hawthorn pixabay.com Crataegus is a large genus of shrubs and small trees in the rose family commonly known as hawthorn. This popular ornamental has showy pink or white flowers in spring and colorful berry-like fruit. Some species also have long thorns that provide protection for wildlife but may be a hazard in the landscape–thornless cultivars are available. Like other rosaceous plants, hawthorns are sus- ceptible to a number of diseases including fire blight, scab, leaf spot and several types of rust. Insect pests include lace bugs and leaf miners. DISEASES Cedar Rust diseases on hawthorn, which include hawthorn rust and quince rust, are caused by sev- eral fungi in the genus Gymnosporangium that spend part of their life cycle on Eastern red cedar (Juni- perus virginiana) and other susceptible junipers, and another part of their life cycle on plants in the rose family, especially Malus and Crataegus. Since two hosts are required for these fungi to complete their life cycle, one way to reduce disease problems is to avoid planting alternate hosts near each other. Hawthorn Rust, caused by Gymnosporangium globosum, is a significant concern for Crataegus spp. in the Northeast (7). Hawthorns are the main broadleaved host for this rust, and yellow-orange leaf spots are the most common symptom. (8). With severe infections, foliage may turn bright yellow and drop prematurely (15).
    [Show full text]