Potato leafhopper is an occasional soybean pest and is most often noticed in early-vegetative fields (Fig. This discoloration is caused by a toxin the leafhopper injects into the alfalfa plant as it sucks out plant juices. 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 … 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 … Other green leafhoppers may be present in alfalfa, such as the threecornered alfalfa hopper, but they are much larger in size. Younger alfalfa is more susceptible to damage at lower leafhopper numbers. As it feeds, it injects a toxin, resulting in a decrease in the plant nutritional quality. Damage is most severe in new seedings and young regrowth. Damaging numbers must be determined before symptoms appear. Potato leafhopper uses its piercing-sucking mouthparts to remove plant juices. 7). Damage. The potato leafhopper is an important insect pest of alfalfa, fruits, and vegetables. In alfalfa, sample using a sweep net and treat based on a combination of potato leafhopper number per sweep and average plant height. Damage symptoms first appear as wedge … A third option for control is planting PLH-resistant alfalfa. Potato leafhopper (PLH) is the most damaging alfalfa insect pest in Ontario. Both potato leafhopper adults and nymphs feed on alfalfa, but the most serious damage is caused by the nymphs. 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. Leafhoppers turn alfalfa yellow and stunt growth, and they especially hurt new seedlings. The amount of damage that potato leafhoppers cause is related to the size of insect population and height of alfalfa. Many farmers are unaware of t 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. The threshold values are: Severe infestations are often associated with fields located near alfalfa fields. EmpoascafabaeHarris. Also, first-year alfalfa fields should be monitored closely, as they tend to be more susceptible to potato leafhopper injury. … The period since the storm passed through has had hot, dry weather. An early symptom of leafhopper damage is a triangular or V-shaped yellow or purple area at the tip of alfalfa leaves. Research has shown that potato leafhopper resistant alfalfa is consistently higher in quality than susceptible alfalfa varieties with or without potato leafhopper … It does not normally impact the first cutting of established alfalfa stands. While the damage created is not as dramatic as an alfalfa weevil outbreak, leafhopper damage is more chronic and widespread. The tips of leaves will turn bright yellow in a characteristic “v” shaped pattern. Very often, infestations go unnoticed until hopper burn is observed. There are numerous reports of alfalfa fields with … 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. Infestations in later cuttings can stunt growth … Obviously, it is a little late for this season’s crop but something to consider for future seedings. As the crop grows, it can handle a greater number of leafhoppers. 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