Efficacy of Esfenvalerate for Control of Insects Harmful to Seed Production in Disease-Resistant Western White Pines

Abstract

The Canadian Entomologist 126: 1075-1092 (1994) Rangeland grasshopper species richness was monitored at 10 sites in Montana, U.S.A., during 1986 through 1992, which included an extreme drought year (1988). We observed significant post-1988 drought reductions in rangeland grasshopper species richness in the eastern and south-central region of Montana where drought intensity has been increasing during the past 20 years. In the north-central region, which also experienced the 1988 drought but showed no long-term drought trend, we did not observe a postdrought reduction in overall rangeland grasshopper species richness. Thus, in terms of rangeland grasshopper species richness, the potential impact of a severe drought in a given year may depend on the timing of such an event within longer-term climatic cycles. Our findings suggest that as regional drought intensity increases temporally, there may be an increased likelihood that a single extreme drought year will not only have a profound impact on abundance but may also result in significant long-term reduction of grasshopper species richness. Our results support the hypothesis that resource limitation is a very important factor in structuring rangeland grasshopper communities in space and time. Kemp, W.P., et M.M. Cigliano. 1994. La skcheresse et la diversite des criquets dans les zones de p2turage. The Canadian Entomologist 126: 1075-1092.

Pine Pitch Canker and Insects: Regional Risks, Environmental Regulation, and Practical Management Options

“…Yet, the most well-known control methods of P. validirostris are chemical treatments [41]. So far, no specific chemical control methods are known for L. occidentalis but insecticides such as dimethoate, carbaryl, synthetic pyrethroid, and permethrin used to control other insects can provide protection for pine cones [263][264][265][266]. In addition, the same authors suggest that visual traps (which emit light at visible wavelengths and inflected wavelengths) would be effective for mass capture of adults.…”