WSU Tree Fruit Research & Extension Center

Organic & Integrated Tree Fruit Production

Tuesday, September 25, 2018

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6525. Brown, P.L.. 1965. Legumes and grasses in dryland cropping systems in the Northern and Central Great Plains.. USDA-ARS Misc. Publ. No. 952.

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.

4817. Nelson, A.L.. 1933. Grasses, alfalfa, and sweetclover at the Archer Field Station.. WY Agr. Expt. Sta. Bulletin 195.
Alfalfa was not successful as a legume in rotation with cereals over 16 years. Oat yields following 2 years alfalfa were 14.7 bu/ac compared to 21.5 following corn. Alfalfa greatly depleted soil moisture.

9143. Birch, T.L. and R.L. Lang.. 1961. Dryland grass seed production as affected by three rates of nitrogen fertilization.. WY Agr. Expt. Sta. Bull. 382.

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