Departments & Units / Based on these numbers, it seems there are a few niche opportunities for PLH-resistant alfalfa varieties. This damage is due to a toxic effect of the insect's saliva. Control may be warranted if potato leafhopper numbers reach or exceed the following levels: If control is necessary, contact your state Cooperative Extension Service or click here for control materials and rates. There are probably three or four generations in the eastern Midwest each year. Purdue University is an equal access/equal opportunity university. Diseases and nutritional deficiencies also cause yellowing of alfalfa. Corn and Soybean Insecticide Evaluations 2008. An average of 6 or more leafhoppers per plant at flowering, or 13 or more at mid-pod development, are thought to be needed to cause significant problems. Lexington, KY 40546-0091 Also, plants under moisture stress appear to be more vulnerable to damage. Reference to commercial products or trade names does not imply endorsement by MSU Extension or bias against those not mentioned. They run when disturbed, moving quickly to the opposite side of the leaf or stem like a squirrel running around a tree trunk. Both adults and nymphs are very active. 859-257-4772, Students / If this is the case, you should not spray. Also, by selecting one plant in each sampling location, determine the average number of trifoliolate leaves per plant. Early harvests often can be used to control potato leafhoppers. Intense leafhopper feeding may reduce plant height, protein and vitamin A content of the hay. The potato leafhopper uses its piercing-sucking mouth parts to remove plant juices. The threebanded leafhopper adult is brown and black with some orange flecks on the wings. Attacks apple as well as many agronomic crops. Jeffrey W. Dwyer, Director, MSU Extension, East Lansing, MI 48824. If your standard practice is using an insecticide for managing potato leafhopper, your best genetic choice will be an elite, adapted alfalfa variety without resistance to PLH. Mid-Atlantic Orchard Monitoring Guide A. Often, leafhopper infestations with high enough numbers to justify treatment are confined to the first 50 to 100 feet of the field margin. Feeding is concentrated on young tissues near the shoot tips. Immediately after completing the 20 sweeps, count the leafhoppers, both adults and nymphs, from the top to the bottom of the bag. Leafhoppers are small multi-colored, wedge-shaped pests that plague backyard gardeners and large-scale agriculture operations worldwide. The immature forms, or nymphs, are pale green and wingless. Adults and nymphs inject a toxic saliva while feeding, which damages the leaf tissue and causes a characteristic yellowing or chlorosis called hopperburn, followed by cupping of young terminal leaves (B). S123 Ag Science – North If potato leafhoppers are "kicked-up" as foliage is disturbed and some leaf discoloration/crinkling is noticed, sampling should be initiated. ENT-17, Insecticide Recommendations for Alfalfa, Clover, and Pastures contains specific control recommendations. Digital Media Library, Photos courtesy Lee Townsend & Ric Bessin, University of Kentucky Entomology, College of Agriculture, Food and Environment. Spring seedings of alfalfa are not cut until late June or early July and they often build up damaging leafhopper populations. This information is for educational purposes only. Of course, ALWAYS READ AND FOLLOW LABEL DIRECTIONS FOR SAFE USE OF ANY PESTICIDE! Please check with your local county agent or regulatory official before using any pesticide mentioned in this publication. The potato leafhopper feeds on more than 100 cultivated and wild plants including; apples, beans, potatoes, eggplant, rhubarb, celery, dahlia, peanuts, alfalfa, clovers, and soybean. Distribution: Widespread in most fruit-growing states and provinces in eastern North America. The pale green to yellow nymphs, are wingless, smaller than the adults, and very quick. New seedings of alfalfa should be sampled beginning in mid-May. Both adults and nymphs are very ac… The nymphs, which cannot fly, walk sideways at a rapid pace when disturbed, while adults will either fly or jump. ENTFACT-115: Potato Leafhoppers | Download PDF. Damage is most likely to occur on late planted soybean. Sweeping alfalfa when it is wet from dew or rain is difficult and the samples are almost impossible to count. If the alfalfa is at 30% bud or more you should plan on cutting within 7-10 days. Management with insecticides – Insecticides are used to control potato leafhopper in … They … Record only the small yellow-green leafhoppers and not the various brown leafhoppers also commonly found. Potato leafhopper. This insect is typically a minor pest in labrusca grapes. The adult potato leafhopper is winged, pale green, wedge-shaped insect about 1/8-inch long. Extension / Soon after cutting you should resample the field to determine the need for control. Hopperburn, the yellow, wedge-shaped area at the tips of alfalfa leaves, is the plant's distinctive response to leafhopper feeding. The adult potato leafhopper is a tiny, yellowish-green, wedge-shaped insect, about 1/8 inch (3 mm) long. If your leafhopper counts exceed the critical values on the table, control measures should be implemented. Michigan State University Extension programs and materials are open to all without regard to race, color, national origin, gender, gender identity, religion, age, height, weight, disability, political beliefs, sexual orientation, marital status, family status or veteran status. Both stages feed on the undersides of leaves. Nymphs are similar to the adults, but are yellow to cream colored (with a faint tinge of green), smaller, and have no wings.
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