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Problems and Pests of Agave, Aloe, Cactus and Yucca

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Problems and Pests of Agave, Aloe, Cactus and Yucca ARIZONA COOPERATIVE E TENSION College of Agriculture and Life Sciences Problems and Pests of Agave, Aloe, Cactus and Yucca AZ 1399 July 2006 Problems and Pests of Agave, Aloe, Cactus and Yucca Jack Kelly Commercial Horticulture Agent Pima County Cooperative Extension Mary Olsen Extension Plant Pathology Department of Plant Sciences This information has been reviewed by university faculty. cals.arizona.edu/pubs/garden/az1399.pdf AZ1399 July 2006 Cooperative Extension College of Agriculture and Life Sciences The University of Arizona Tucson, Arizona 85721 Issued in furtherance of Cooperative Extension work, acts of May 8 and June 30, 1914, in cooperation with the U.S. Department of Agriculture, James A. Christenson, Director, Cooperative Extension, College of Agriculture & Life Sciences, The University of Arizona. The University of Arizona is an equal opportunity, affirmative action institution. The University does not discriminate on the basis of race, color, religion, sex, national origin, age, disability, veteran status, or sexual orientation in its programs and activities. Table of Contents Abiotic (non-living) problems ......................................................................................3 Selecting the correct plant and planting ........................................................................................3 Freeze Damage .............................................................................................................................3 Sunburn .........................................................................................................................................3 Planting depth ...............................................................................................................................4 Poorly drained soils .......................................................................................................................4 Irrigation ........................................................................................................................................4 Hail damage ..................................................................................................................................4 Diseases ........................................................................................................................4 Fungal lesions ...............................................................................................................................4 Bacterial necrosis of saguaro ........................................................................................................5 Fungal crown rot of Echinocereus .................................................................................................5 Phyllosticta pad spot .....................................................................................................................6 Pythium rot of barrel cacti ..............................................................................................................6 Root and crown rot of agaves .......................................................................................................6 Sammon’s virus of Opuntia ...........................................................................................................6 Insects ...........................................................................................................................6 Agave Snout Weevil ......................................................................................................................6 Cactus longhorn beetle (Moneilema gigas) ...................................................................................7 Cochineal scale (Dactylopius coccus) ...........................................................................................7 Plant bugs ......................................................................................................................................7 Aloe mites ......................................................................................................................................8 Animals ..........................................................................................................................8 4 The University of Arizona Cooperative Extension Agaves, aloes, cacti and yuccas are classified as succu- crisp. Freeze damage lents — plants that have highly specialized anatomical fea- cannot be repaired, but tures such as thick waxy cuticles, fleshy or minimal leaves, unless the freeze is of modified leaves (spines), and roots with extra storage capa- particularly long duration bilities for food and water. These modifications allow them or exceptionably cold, to survive and thrive in harsh desert environments. They the damage may be only survive long periods of drought in areas of sparse rainfall cosmetic and the plant and intense heat. During stressful periods many succulents will grow out of it. When cease to grow. They drop unnecessary leaves, dehydrate exposed to a severe freeze, and become dormant until conditions for growth return. portions of columnar Despite their adaptations, succulents suffer from diseases, cacti will yellow, and insect pests and horticultural problems. Some of the more Figure 2. Severe freeze damage on Cereus then die completely (Fig. common problems that occur in agave, aloes, cacti and yuc- peruvianus 2). In freeze-damaged cas in Arizona are discussed in this bulletin. barrel-type cactus, the margins of ribs become straw yellow. If temperatures are not substantially below freezing (a “hard freeze”) and the Abiotic (non-living) problems freeze lasts for only a few hours or less, only the epidermis may be damaged and the plant will outgrow the damage in Abiotic problems are not caused by living organisms. several years. They include poorly drained soils, sun exposure, and weather events such as cold and high temperatures, exces- Freeze damage can be prevented. It is important to become sive rainfall, over watering, planting too deeply and hail acquainted with temperature requirements of the particular damage. In transplanted agaves, aloes, cacti and yuccas, species. Protective measures often can be taken to ensure abiotic problems are probably the most common problems survival. Cold-sensitive plants should be grown in areas that growers and homeowners encounter. that receive radiated heat at night from a patio or wall or in hilly areas where air temperatures are slightly warmer. Selecting the correct plant and planting location Covering the plant with a cotton sheet will help on nights Careful selection of species that are suited to your local that are just at or slightly below freezing. Another strategy conditions is necessary and will eliminate or diminish seri- is to place a 60-watt light bulb under the cotton sheet, tak- ous problems. Choose species that are found in your neigh- ing care that the light bulb does not touch the plant or the borhood or area. Visit specialty cactus and succulent nurs- cotton sheet. Do not cover the plant with plastic sheeting. eries and discuss cold hardiness, heat and cold tolerance, Plastic is a poor insulator and will transfer the cold directly mature size of the plant, growth rate and known problems to the plant wherever it touches the plant. Containerized of a specific plant with the nursery personnel. Contact your plants can be moved indoors until freezing weather has local Cooperative Extension office for expert advice. Visit passed. If kept dry and placed in a brightly lighted area, local arboreta that have extensive succulent collections. they will survive without damage. Choosing the right plant for the right place is the first step Extremely low temperatures may cause a loss of turgor in in successfully growing these unique plants. saguaros. This causes sagging of branches (arms) or death Most succulent species originate in areas of diverse habi- of the apical meristem (growing tip) that results in saguaros tats. For example, many agaves grow in pine and oak for- with many stems or ‘heads’. ests, open grasslands and even in barren open areas. By researching a little about your plants and their special re- Sunburn quirements, they can be planted in areas of your yard that Sunburn is a fulfill most of their requirements. common problem in Freeze Damage greenhouse or shade house grown plants. Many of the more showy It is also problematic and exotic succulents when plants grown in originated in frost-free open beds or filtered climates. As a result, when sunlight in nurseries are temperatures remain below transplanted into open freezing for several hours, landscapes. Those parts they suffer freeze damage. of the plant that have not The damage originally Figure 3. Sunburn on golden barrel cactus. been acclimated to direct manifests itself as blackening sun will burn easily. of the exposed parts of the Sunburned plants turn yellow. As the damage progresses, plant (Fig. 1). After a few the epidermis turns straw yellow, then tan and dies (Fig. 3). Figure 1. Freeze damage on Agave. weeks, the blackened area The plant often will recover but is permanently scarred. will dry out and become The University of Arizona Cooperative Extension 5 Sunburn can be minimized in nursery-grown plants by plant health and growth during summer. On heavier soils placing the plant in the same direction as it had been previ- such as clay soils the watering interval may be decreased. ously growing. Many nurseries will mark one side of the On sandy or very rapidly draining soils the frequency will
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