The most common damage symptom is a yellow, wedge-shaped area at the tip of the leaf … Figure 6. There are numerous reports of alfalfa fields with … In alfalfa, sample using a sweep net and treat based on a combination of potato leafhopper number per sweep and average plant height. The tips of leaves will turn bright yellow in a characteristic “v” shaped pattern. Very often, infestations go unnoticed until hopper burn is observed. Potato leafhopper, a small bright green insect which migrates annually from the gulf coast to Kentucky on wind currents (Figure 1), can cause significant injury to alfalfa if left unmanaged. Younger alfalfa is more susceptible to damage at lower leafhopper numbers. Potato leafhopper uses its piercing-sucking mouthparts to remove plant juices. The treatment threshold for potato leafhoppers is variable as the economics of hay production is so dynamic depending upon the end use of the hay. While the damage created is not as dramatic as an alfalfa weevil outbreak, leafhopper damage is more chronic and widespread. Damaging numbers must be determined before symptoms appear. The storms also brought potato leafhoppers along with the rain. Research has shown that potato leafhopper resistant alfalfa is consistently higher in quality than susceptible alfalfa varieties with or without potato leafhopper … Also, first-year alfalfa fields should be monitored closely, as they tend to be more susceptible to potato leafhopper injury. The threshold values are: 7). Damage symptoms first appear as wedge … An early symptom of leafhopper damage is a triangular or V-shaped yellow or purple area at the tip of alfalfa leaves. Both potato leafhopper adults and nymphs feed on alfalfa, but the most serious damage is caused by the nymphs. As the crop grows, it can handle a greater number of leafhoppers. Damage. Potato leafhopper (PLH) is the most damaging alfalfa insect pest in Ontario. The amount of damage that potato leafhoppers cause is related to the size of insect population and height of alfalfa. Leafhoppers turn alfalfa yellow and stunt growth, and they especially hurt new seedlings. It does not normally impact the first cutting of established alfalfa stands. Potato leafhopper is an occasional soybean pest and is most often noticed in early-vegetative fields (Fig. Potato Leafhopper. As it feeds, it injects a toxin, resulting in a decrease in the plant nutritional quality. The potato leafhopper is an important insect pest of alfalfa, fruits, and vegetables. Other green leafhoppers may be present in alfalfa, such as the threecornered alfalfa hopper, but they are much larger in size. This is the ideal type of weather pattern that favors high potato leafhoppers feeding and damage in both alfalfa and dry beans. Severe infestations are often associated with fields located near alfalfa fields. Potato leafhopper is more sporadic in our peanut fields than threecornered alfalfa hopper, but the “hopper burn” that is caused by its feeding can be dramatic. EmpoascafabaeHarris. Regrowth (plants under 3 inches) is particularly vulnerable to potato leafhopper damage. Established fields should be sampled after first cutting, while new fields (fall- or spring-seeded) should be sampled beginning about May 25. Hot, dry weather is high risk. However, potato leafhoppers can stress alfalfa in 2 ways–removing plant fluids due to their feeding with the simultaneous injection of a toxin (see fig 2 of “hopper … Though its host range extends to over 100 plants including alfalfa, soybean, beans, apples, potatoes, and grapes, the potato leafhopper causes the most significant amount of injury to alfalfa and … A third option for control is planting PLH-resistant alfalfa. Damage is most severe in new seedings and young regrowth. Infestations in later cuttings can stunt growth … … The period since the storm passed through has had hot, dry weather. Obviously, it is a little late for this season’s crop but something to consider for future seedings. This discoloration is caused by a toxin the leafhopper injects into the alfalfa plant as it sucks out plant juices. Many farmers are unaware of t If alfalfa is more than seven days from a cut and plants are under normal stress, a good rule of thumb for a treatment threshold is: when the number of leafhoppers in a 10-sweep set is equal to or greater than the height of the alfalfa. Other small leafhoppers found in alfalfa are brown or gray in color and do no apparent damage. As dramatic as an alfalfa weevil outbreak, leafhopper damage is most often noticed early-vegetative. Alfalfa fields … Both potato leafhopper is an occasional soybean pest and is often. An alfalfa weevil outbreak, leafhopper damage is caused by the nymphs hurt new seedlings often! 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