Effects of foliar application of dried yeast solution on population density of broad mite, Polyphagotarsonemus latus (Banks) on potato

Abstract

This study were conducted at the fields of College of Agriculture in Abu-Ghraib, to investigate the effects of foliar application with different concentrations of dried bread yeast on the population density of the broad mite, P. latus on potato plants, cultivar (Desari) during the fall seasons of 2006-2007. potato plants were treated at the age of 4-5 true leaves then the application was repeated twice intervals of ten days. Results indicated that the numbers of eggs, larva and adult were significantly different in treated plants. The number of broad mite in 4th week of plant age was 3.66, 6.00, 7.33 eggs, larva, adult / leaf respectively moreover, the density was significantly increased with the other yeast treatment. The higher density for eggs and adults was in the 10th week of plant egg however, in the 8th week the higher density was 17.33 larva / leaf in the concentration 8 g/L. In the 14th week the density was reduced as the