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Saturday, July 21, 2018

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385. Anon.. Sept. 1989. A plague of pesticides?. Harrowsmith, p. 118..
Intensive applications of broad-spectrum insecticides in Wyoming have probably benefitted grasshoppers more than ranchers. Researchers compared pesticide use and grasshopper infestations in two bordering counties. Infestations were more frequent and longer lasting in one county even though the other county did more spraying. Apparently, the spraying was more damaging to predators and parasites of grasshoppers than to the grasshoppers.

3145. Lockwood, J, W. Kemp, and J. Onsager. 1988. Long-term, large-scale effects of insecticidal control on rangeland grasshopper populations.. J. Economic Entomology 81:1259-1264.
Intensive application of broad spectrum insecticides to control economically damaging populations of rangeland grasshoppers in Wyoming appears to have increased the probability, duration, and stability of grasshopper outbreaks. The study compares about 30 years of data on grasshopper infestations and pesticide management between bordering counties. The county with greater insecticide treatment had longer, more stable, and more frequent infestations that were economically damaging. This was attributed to the reduction of parasites and predators of grasshoppers.

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