Monitoring and predicting population growth of Rhysopertha dominica (Coleoptera: Bostrichidae) over a range of environmental conditions
1996
Hagstrum, D.W.
Population growth of lesser grain borer, Rhyzopertha dominica (F.), in 135-kg lots of hard red winter wheat, Triticum aestivum L., was monitored at 3 grain moisture levels (approximately 10, 12, and 14%) at each of 3 temperatures (approximately 22, 27, and 32 degrees C). Over this range of environmental conditions, a published population growth model explained 64-96% of the variation in insect density. Based on published studies and new data collected for developmental times, new equations were developed for egg production and developmental time, and daily adult mortality was estimated. Substituting new equations and mortality rate in the published model improved predictions, increasing by 3-24% the percentage of variation explained. The biggest improvements tended to be at the extreme grain moisture and temperature conditions.
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