Efficiency of insect predator Chrysoperla carnea against Bemisia tabaci on eggplant crop under greenhouse conditions

الملخص EN

The study was aimed to measure the effectiveness of predator Chrysoperla carnea in reducing the population of whiteflies Bemisia tabaci on eggplant crop in greenhouses.

In 2013, the lacewings predators were released on eggplant crop in greenhouse at rate of 20, 40, 80, 100, 150 and 200 eggs / 2m distance; 25, 50 and 75 larvae / 2m distance; and 5 larvae / plant in comparison with the insecticide Esters as well as the control treatment.

Results were measured after seven days.

The highest efficiency was achieved by releasing 50 larvae /2 m (58%) without significant differences from the efficacy of insecticide - Aster (62%) and both were did not differ significantly from the effect of 75 larvae / 2m , 100, 150 , 200 eggs /2 m and 5 larvae / plant.

Weakest results were by releasing 20 eggs / 2m, but it did not differ significantly from 40 and 80 eggs / 2m.

Generally the efficiency of the predator increased with increasing of nymphs’ population density at a decreasing rate with the increasing of population density during the season.

At t3The following season (3T2014) 3Tthe release of 253T first instar larvae of predators (C.

carnea) 3T/ plant achieve 34% reduction in the pest nymphs (3TB.

tabaci)3T and 38% reduction in the pest eggs (3TB.

tabaci); 3Tat the release of 50 larvae /plant the reduction in the nymphs was 693T% while it was 70% 3Tfor the eggs, releasing of 200 larvae has 89% and 823T% 3Treduction in the nymphs and eggs3T, respectively.

3TThe population density rate of adult predator reached at the end of the season to 40 adult/ plant3T, which 3Tachieve %38 reduction in the population density of whiteflies adult.