Control Grasshoppers When They Are Young

Young nymphs of the eastern lubber grasshopper, Romalea microptera (Beauvois), clustered on a citrus reset (young citrus tree). Photograph by John Capinera, University of Florida.

Young nymphs of the eastern lubber grasshopper, Romalea microptera (Beauvois), clustered on a citrus reset (young citrus tree). Photograph by John Capinera, University of Florida.

The Eastern Lubber Grasshopper, also known colloquially as the “Georgia Thumper,” can be highly destructive to a variety of vegetable crops. This May many growers and vegetable gardeners have reported unusually high numbers of nymphs, the juvenile form of the grasshopper.

This observation is consistent with the usual increase of nymphs in vegetable gardens during the spring months. The old adage of “an ounce of prevention is worth a pound or cure” applies here. Now is the time to exert control over the nymphs before they mature. Adults do the greatest crop damage in July and August.

Additionally, adult females lay their eggs in the summer, with hatching the following April. Reducing the numbers this year will reduce the numbers in the following years.

The first step to control of the Eastern Lubber Grasshopper is prevention. They like to feed on weedy vegetation, so reducing weed cover in and around crops will reduce the incidence of Eastern Lubber damage. Short vegetation does not usually provide enough forage for grasshoppers, so mowing vegetation around fields is an excellent preventative strategy.

Although most home gardeners can control Eastern Lubber Grasshoppers by mechanical means (hand picking) this is usually not a feasible option for large gardens or small farm plantings. Fortunately, there are several products on the market for commercial producers to use.

Keep in mind, grasshoppers are much easier to control while they are in the young nymph stage, so early action is paramount when nymphs are observed. Several effective insecticides include carbaryl, bifenthrin, cyhalothrin, permethrin, and esfenvalerate. Look at the label to find these active ingredients, since they are sold under various brand names.

For more information about the Eastern Lubber Grasshopper or for specific crop recommendations, please visit this UF/IFAS publication on Grasshoppers and the UF/IFAS Featured Creatures Entomology Page.

 

2 Comments on “Control Grasshoppers When They Are Young

  1. Dear Matthew,
    The young lubbers have a habit of collectively gathering on vertical plant leaves such as iris. I find multiple groups of them in the early morning. I used to pick them off individually, but found that I could get rid of them easier with my shop vac. I once had hundreds of lubbers gathered on the stucco wall outside my potting shed. I vacuumed them all in minutes. After this, I filled the vacuum with water, waited a couple of hours and then emptied and cleaned the canister. Safe, easy and effective.
    Judy

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