Developmental Stages and Life Table Parameters of the Two Spotted Spider Mite,Tetranychus Urticae Koch (Acari: Tetranycidae) On Different Eggplant Genotypes.

Document Type : Original Article


Plant Protection Research Institute, Agriculture Research Center, Doki, Giza, Egypt


The two-spotted spider mite, Tetranychus urticae Koch. (Acari: Tetranychidae) is considered one of the most serious pests all over the world and attacked about 1200 species of plants. It causes damage to vegetables, beans, peas, hops, grapes, deciduous fruit trees and many other fruit and flowers. Also, it prefers some genotypes of a plant to other genotypes of the same plant. This study is concerned mainly with evaluating the less favorite eggplant genotype to T. urticae  and the best type for agriculture and find out the possible reason behind this preference.  The longest life cycle was recorded for Rima F1 that was11.20 days and the shortest was 8.93 days for Rondona F1. Also, Rima F1 had the longest generation of 12.37 days and Rondona F1 had the shortest generation 10.37 days. The fecundity of females feed on leaves of Rondona F1 was the highest at 101.14 eggs/ female. So the results proved that Rima F1 was less affected by T. urticae. The possible reason for this preference is that Rima F1 had the highest percentage of potassium in their leaves that provides a mechanical resistance against piercing-sucking pests including T. urticae.