الفهرس 
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Abstract
Rice, Oryza sativa (L.), is subjected to some insects in Egypt , specially the rice stem borer Chilo Agamemnon Bles. which is considered the most important insect pest . To minimize the borer infestation under the economic level, some experiments were conducted in the Farm of the Faculty of Agriculture at Kefr El-Sheikh to study the effect of some rice varieties and some agricultural operations on the borer infestation. The following are the obtained results:
1- Philippini varieties. IR 579 and IR 1561 were found relatively resistant to the borer attack, while Giza 171 and Giza 159 were the most susceptible varieties. Giza 170, Giza 172 and Nahdn were infested by moderate infestation • This result may be attributed to the differences in the morphological characters of the tested rice varieties
2-The late cultivation suffered from the heavy borer attack than the early ones • The highest borer infestation were recorded for rice plants sown on the first of June.