Abstract
Pupae (1, 2 and 3 days old) of three stored grain beetles, Trogoderma granarium, Tribolium castaneum and Callosobruchus chinensis, were subjected to temperatures of 30, 40 and 45°C with an exposure period of 24, 48 and 72 h for each age-group. Observations of adult emergence and their progeny revealed that though all the temperatures were effective in causing sterility, exposure to 45°C was particularly effective in suppressing adult formation. With T. castaneum and C. chinensis, adult emergence was totally prevented by 48 and 72 h exposures to 45°C. With T. granarium, the inhibitory effect was greater with male pupae and the resultant adults were completely sterile.
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