Abstract
Computer analysis of population data for mites, predominantly Tetranychus turkestani Ugarov & Nikolski, in 8 soybean fields during a 7-year period showed a significant correlation with both rainfall and maximum temperature. Rainfall accounted for 51.3% and average maximum temperature for 25.3% of the population variation. Climatological conditions during August appeared to be the most important. Correlation of rainfall totals with mite population for each of the months June through September indicated that August rainfall was most influential. Moreover, of the monthly average maximum temperatures, only those of August were significantly related to peaks of mite abundance. Measurement of soybean leaf temperatures for 2 weeks with electrical monitoring equipment showed that T. turkestani lives under temperature conditions that can fluctuate widely within short periods.
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