Use of cold suceptibility of eggs and larvae of the rice moth Corycra cephalonica (Stainton) (Lep., Pyralidae) for their control
1989
Etman, A.A.M. (Cairo Univ. (Egypt). El-Fayoum Faculty of Agriculture. Dept. of Plant Protection)
Experiments were conducted to evaluate the effect of storing wheat flour for various length of time at minu 10 degrees, 0 degree, and 5 degrees C, on the mortality of the egg and larval stages of Corcyra cephalonica (Stainton). Treating eggs with minus 10 degrees C for 10 h, 0 degree C for 10 and more days, or 5 degrees C for 15 days, stopped all embryonic development, and hence 100 per cent mortality of eggs was obtained. Also, 100 per cent mortality was observed when first-instar larvae were treated with minus 10 degrees C for 2 h and more, or 0 degree C or 5 degrees C for 5, 10 or 15 days. Storing wheat flour infested with different stages at 0 degree C for 5 days and more, or at 5 degrees C for 15 days prevented the development of immature stages and thus no adults emerged. It can be concluded that storing small quantities of flour at 5 degrees C for 15 days, or at 0 degree C for 10 or 15 days would be effective in controlling C. cephalonica, if no pupae are present at the time of treatment
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