Abstract
Farag, A.A., A.H. El Kenawy and E.A. Refaei. 2023. Field Evaluation of a Commercial Biopesticide in Comparison with a Conventional Insecticide Against Spodoptera littoralis (Boisduval) and Scrobipalpa ocellatella (Boyd) Sugar Beet Insect Pests and their Effect on the Associated Predators. Arab Journal of Plant Protection, 41(3): 266-271. https://doi.org/10.22268/AJPP-041.3.266271 In this study, the insecticidal activities of one commercially available biopesticide, Biotect of B. thuringeinsis var. kurstaki, (9.4% WP, 32000 I.U./mg), and the conventional insecticide, Andros 5.7% WDG (Emamectin benzoate), against Spodoptera littoralis (Boisd.) and Scrobipalba ocellatella (Boyd) larvae and three natural enemies; Chrysoperla carnea (Steph.), Coccinella undecimpunctata L. and Scymnus interruptus (Goeze) were evaluated during 2020 and 2021 seasons in sugar beet fields at Kafr El-Sheikh Governorate, Egypt. Andros was the most effective against S. littoralis and S. ocellatella populations with reduction of 83.3% and 91% in 2020 and 82.60% and 88.96% in 2021, respectively. Whereas, Biotect had the least effect with 67.2% and 60% reduction in 2020, and 70.12% and 56.4% reduction in 2021 for S. littoralis and S. ocellatella, respectively. On the other hand, treatments had a mediocre effect during the two seasons on the predators. Andros showed the highest effect on S. interruptus larvae with a reduction of (91.0% and 98.5% reduction), on C. undecimpunctata (81.66% and 83.22% reduction) and on C. carnea (78.12% and 86.19% reduction) in 2020 and 2021 growing seasons, respectively. Andros induced the highest decline in insect numbers. From this study, it can be proposed that Biotect is a promising B. thuringeinsis product for the biocontrol of cotton leaf worm and beet moth under field conditions. Keywords: Sugar Beet, Spodotera littoralis, Scrobipalba ocellatella, Biopesticides, Predators, Field evaluation.
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