Abstract
The impact of Bacillus thuringiensis and native Trichogramma turkistanica on the infestation rates of two lepidopterous pests, Virachola livia and Ectomyelois ceratoniae, was assessed in field experiments conducted in four pomegranate farms distributed in the Taif region of Saudi Arabia. Pomegranate trees were sprayed with B. thuringiensis spores, and indigenous T. turkistanica was inundatively released during the pomegranate fruiting season from April to September of 2014. The highest infestation rates with E. ceratoniae and V. livia in control and treated trees gradually increased until the end of the season, reaching 79, 54 and 22 % for E. ceratoniae, and 22, 16 and 7 % for V. livia in control, Bacillus-treated trees, and Trichogramma-treated trees, respectively. The mean percentages of fruits infested with E. ceratoniae or V. livia were significantly different between the untreated trees and both the trees treated with Trichogramma and those treated with Bacillus. Moreover, the trees treated with Tric...
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