Preliminary field observations on the preference of stem borers to different graminous host plants.
Preliminary field observations on the food-plant preferences of the cereal borers Sesamia cretica, Chilo agamemnon and Ostrinia nubilalis in the El-Serw region of Egypt were carried out from the end of August to the end of October 1979 on 11 species of grasses and cereal crops. Panicum repens, followed by maize, proved to be the most suitable food-plant for S. cretica, and removal of P. repens during the winter may reduce infestation during the following spring and summer. Rice was the most favourable food-plant for C. agamemnon, followed by Echinochloa crus-galli and Agropyron repens [Elymus repens], and sugarcane was not infested by this species if the 3 plants mentioned were present. Maize was the most favourable food-plant for O. nubilalis, while Echinochloa crus-galli and Elymus repens were seldom infested by it and the other test plants not at all.