EVALUATION OF SOME SOYBEAN VARIETIES TO NATURAL INFESTATION WITH WHITEFLY BEMISIA TABAC1(GENN.) AND SPIDER MITE TETRANYCHUS URTICAE (KOCH.) IN UPPER EGYPT

Document Type : Original Article

Authors

Plant Protection Research Institute, Agricultural Research Centre, Dokki, Giza, Egypt.

Abstract

Six soybean varieties namely, Giza111, Giza35, Giza21, Giza82, Clark and Crawford were tested for infestation with cotton whitefly Be­roisia tabaci (Genn.) and spider mite Tetranychus urticae (Koch.) in Shandweel Research Station, Sohag Governorate during two successive seasons, 1999 and 2000. The seasonal abundance of the whitefly was moderately low during July, then reached its peak during August and the population decreased to the lowest level in September in the two suc­cessive seasons. The same trend was noticed for the spider mite. Statis­tical analysis showed that there were significant differences between the soybean varieties and the infestation with the two pests. Soybean varieties can be arranged for their susceptibility to infes­tation with whiteflies as follows; Giza35 and Crawford as susceptible ones, while 6.111, G.21, G.82 and Clark were tow resistant. In case of the spider mite, however, Giza 21 and Crawford were susceptible, while G.111, G.35, G.82 and Clark were low resistant

Files

Share

How to cite

Statistics