The Q&A Archives: Grasshoppers

Question: I noticed small black grasshoppers on my yellow lillys. I also noticed that the many buds I have, are now gone due to being eaten by these grasshoppers. What should I use to keep them off of what is left of my lillys? Thank You !

Answer: Grasshoppers are difficult to deter because they come in from neighboring fields and yard. A biological control disease organism, the protozoan Nosema locustae might work. Nosema locustae is most effective on young grasshoppers. This biological control will reduce grasshopper numbers over a few days or weeks, but, generally, it is a slow-acting disease that takes at least a year to affect grasshopper populations. N. locustae is available at many garden shops and nurseries and is sold under various trade names. Use this product strictly according to label instructions. Because adult grasshoppers are older and tougher than the nymphs, they are more difficult to control. Deter them from your garden by keeping other areas of your property well-watered to provide a lush alternative to your lilies.

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