Abstract
Temperature, relative humidity, grain sample, and insect strain all produced small but significant effects on the number of wheat grains damaged by individual larvae of Tribolium castaneum during their development. Only germs of grains were consumed in most cases. The range of variation in mean number of germs consumed attributable to the physical factors (3.3–4.1) was similar to variation among insect strains (3.5–4.2) but was less than variation among grain samples (3.1–4.3). Because some of the major causes of variation cannot be readily measured, and variation is relatively limited, a fixed value of 4.1 for the number of germs attacked by larvae is proposed as a useful approximation in relationships between numbers of T. castaneum larvae and amount of damage to wheat grain.
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