2011 | Umass Extension Landscape Nursery & Urban Forestry
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UMass Extension Landscape Message #17 - 2011 | UMass Extension Landscape Nursery & Urban Forestry | UMass Amherst UMass Amherst UMass Amherst Center for UMass Extension Agriculture Home About Services Landscape Message Weed Herbarium Publications & Resources Education News & Events UMass Extension Landscape Message #17 - 2011 June 24, 2011 Quick Links Scouting Information by Region Scouting Information Regional Notes Regional Notes Cape Cod Cape Cod Region (Barnstable) – General Conditions: This reporting period enjoyed lovely early summer weather, with daytime highs in the upper 70s and overnight lows in the upper 50s to low 60s. Most days Southeast were very sunny, with occasional cloudy conditions moving in. There was no precipitation during this East reporting period. Roses are coming into bloom as Peonies go by. Fireflies are providing light shows at night. Metro West Pests/Problems: Cottony maple scale and Cottony Taxus scale are ovipositing. Many samples, particularly Central of Kousa dogwood, have come into the office loaded with the cottony egg masses. Asiatic garden beetles are Pioneer Valley emerging and feeding on tender foliage and flower parts at night. Green head flies are starting to appear Berkshire near the shore and salt marshes. Earwig populations are enormous this year and they are skeletonizing Environmental Data seedlings of annuals and vegetables. Wilted leaders on small white pine indicate the presence of white pine Phenology weevil larvae. Prune these out before they complete their development and emerge as new adults. Deer tick Woody Ornamentals nymphs are plentiful in the landscape. Do thorough tick checks several times during the day. Spittlebugs on pine and on herbaceous plants are very visible. Poison ivy is lush. Foliar disease such as anthracnose of Landscape Turf maple and sycamore continue, along with scab on crabapple and black spot of rose. Archived Messages Southeast Region (Hanson) – General Conditions: Hanson received 0.3 inches of rain this past week and soils are dry. However, rain is in the forecast. Let’s hope the forecast is on target. Southern Catalpa, Stewartia pseudocamellia (Japanese Stewartia), Stewartia rostrata, Cornus kousa, Spiraea sp., Itea virginica, Calycanthus, Indigofera sp., Rosa rugosa, Japanese tree lilac, Kalmia, Lonicera japonica (invasive), Wisteria frutescens (American wisteria), Hydrangea arborescens (Smooth Hydrangea), summer-flowering azaleas, Hypericum androsaemum ‘Mrs. Gladis Brabazon’, Oenothera sp., Clematis, Gazania, Gillenia trifoliata (Bowman’s Root), Foxgloves, Thalictrum flavum subsp. glaucum, Campanula, Alchemilla, Astrantia, Aruncus, Tradescantia, Allium, Nepeta sp., Salvia sp., Baptisia hybrids, Anemone canadensis, Amsonia sp., Valeriana officinalis (Garden Heliotrope), Geranium sp., Corydalis lutea, Asiatic garden lilies, Dianthus, Persicaria polymorpha, Stella d'Oro and other early daylilies, and Hosta are in full bloom. Styrax japonica is ending bloom. The European Smokebush (Cotinus coggyria) and the native, American Smoketree (Cotinus obovatus) are providing the landscape with colorful ‘smoke.’ Smoke bush produces small greenish flowers in June, and the subsequent ‘smoke’ is the result of plume-like hairs which form on the sterile flowers. Looks like it will be another banner year for Hydrangea macrophylla (Bigleaf Hydrangea) and lacecap Hydrangea are starting to bloom. Pests/Problems: White-spotted pine sawyer, Cottony Camellia Scale, Pieris or andromeda lace bug, Giant Leopard Moth, aphids, four-lined plantbug, slugs, snails, cutworms, lily leaf beetle and larvae, wasps and hornets, horse flies, deer flies, carpenter bees, bumble bees, mosquitoes, and ticks are all active. Along with plenty of mosquitoes and ticks, it is a thriving season for slugs and snails. Deer tick nymphs are active and there have been numerous reports of people finding deer ticks on them. The deer tick nymph is very tiny and it is this deer tick stage often associated with the transmission of Lyme disease. The following paragraph, written by Roberta Clark, is taken from the June 6, 2011, issue of Hort Notes and provides some good advice: “Prevention is the key! Thorough tick checks should be done after working in grassy or brushy areas. Toss clothing worn outdoors into a dryer and run it on high for ten minutes. Shower shortly after working in tick habitat. Insect repellents are one of the first lines of defense against ticks and the diseases they can transmit. The most common products contain DEET and are applied to skin. An alternative strategy is to apply repellent or toxicant products (usually permethrin) to clothing or other fabrics rather than directly on the skin. This method has many positive features, including that chemicals are not applied to skin, potentially reducing chemical exposure as well as increasing the duration of efficacy, which can last through multiple launderings. Be sure to treat shoes as well. There are commercial lines of clothing available that come pretreated with permethrin. If you find an attached tick that is obviously engorged, it can be sent to the UMass Tick Assessment Lab to see if it carries the Lyme disease bacterium. Go to http://www.umass.edu/tick for information on submitting a specimen. Mosquitoes continue to be numerous. Plymouth County Extension does not spray for mosquitoes. The number for residents of Plymouth County to call is 781-585-5450. Beneficial insects, like hover flies and ladybugs (and their colorful larvae) are active. Foliar leaf spots continue to show up on a wide variety of plant material: Powdery mildew, anthracnose, http://extension.umass.edu/landscape/message/lm-172011[5/23/2012 11:25:46 AM] UMass Extension Landscape Message #17 - 2011 | UMass Extension Landscape Nursery & Urban Forestry | UMass Amherst black spot on rose and apple scab are all prevalent. White clover, fleabane, nightshade, yellow toadflax and multiflora rose are in full bloom and clearweed is everywhere. Deer, voles, rabbits and chipmunks remain active. During dry weather, continue to remind clients to water trees damaged by winter moth caterpillars and also to water newly planted trees, shrubs and perennials. East Region (Boston) – General Conditions: We gained 146.5 GDDs this week, but we still trail 2010 by 187.5 days. We had moderate temperatures averaging 80° C and only 0.1 inches of rain. Many plants continue to enjoy these growing conditions. Daphne tangutica has begun its second round of flowering, the white softly fragrant flowers causing the red berries to stand out amongst its dark green leaves. Just beginning to flower are the bush honeysuckles (Diervilla rivularis and Diervilla sessilifolia), Hydrangea [H. arborescens (smooth hydrangea) and H. quercifolia (oakleaf hydrangea)], Spiraea [S. japonica (Japanese spirea) and S. virginiana (Virginia spirea)], Symphoricarpos ‘Kordes’ (coralberry) and Tripterygium wilfordii. Magnolia virginiana (sweetbay magnolia) continues to bloom sporadically, while Stewartia [S. pseudocamellia (Japanese stewartia) and S. sinensis (Chinese stewartia)] and Tilia sp. (linden) have started to bloom. The highly fragrant Actinidia [A. kolomikta (Kolomikta kiwi) and A. polygama (silvervine)] have started to flower while Clematis cultivars continue to put on a colourful display as does Ceanothus x pallidus var. roseus, Lonicera periclymenum (woodbine honeysuckle), Schizophragma hydrangeoides (Japanese climbing hydrangea) and the ground clematis (C. hexapetala and C. recta ‘Purpurea’). The native Silphium perfoliatum (cup plant) is just beginning to show some colour. The ericaceous Zenobia pulverulenta (dusty zenobia) is quite the sight, its white and pale pink flowers continue to flower along meadow road. Pests/Problems: Hummingbird Clearwing Moth (Hemaris sp.) and Giant Leopard Moth (Hypercompe scribonia) have been spotted. Humulus japonicus (Japanese hop) is quickly growing and was weeded out to reduce its further spread. Currently in seed are Alliaria petiolata (garlic mustard), Chelidonium majus (greater celandine), Cynanchum nigrum (black swallowwort) and Lepidium virginicum (Virginia pepperweed). Cichorium intybus (common chicory) is starting to flower as Galium mollugo (false baby's breath), Lapsana communis (nipplewort) and Oxalis stricta (yellow woodsorrel) continue to flower. Cuscuta sp. (Dodder) is beginning to take hold of Impatiens capensis (jewelweed). Metro West (Acton) – General Conditions: Summer is officially here! The Metro West area gained 126.5 growing degree days this past week and received 0.1” of rain. Soils are moist with the frequent rain that the area has been receiving over the past two weeks. The rainfall total for this month so far has been 2.25”. Average rainfall for the month of June is 3.61”. Woody plants in bloom are: Campsis radicans (Trumpet vine), Catalpa speciosa (Northern Catalpa), Clematis ‘Betty Corning’, Cornus x rutgersensis ‘Ruth Ellen’ (Rutgers Hybrid Dogwood), Ilex glabra (Inkberry), Kalmia latifolia (Mountain Laurel), Leucothoe axillaris (Coast Leucothoe), Liriodendron tulipfera (Tulip Tree), Magnolia virginiana (Sweetbay Magnolia), Physocarpus opulifolius (Common Ninebark), Rhododendron spp., Rosa spp.(Rose), Sambucus canadensis (Elderberry), Spirea japonica ‘Alpina’ (Daphne Spirea), Stephanadra incisa (Cutleaf Stephanadra), Stewartia pseudocamellia (Japanese Stewartia), Styrax japonica (Japanese Snowbell) and Viburnum dentatum (Arrowwood Viburnum). Herbaceous plants in bloom this week are: Achillea filipendula (Yarrow), Alchemilla mollis (Lady’s mantle),