Field Efficacy of Selected Insecticides against Spodoptera littoralis, Aphid Species and Bemisia tabaci on Stevia Plants

Abstract

The field efficiency of some insecticides were evaluated against major insect species of stevia plants. The obtained results demonstrated that all of the insecticide treatments significantly reduced densities of tested insects compared to the untreated check. Average mean of reductions in S. littoralis larvae were 58.96, 69.28, 71.70 and 83.59% for leufenuron, indoxacarb, emamectin benzoate and methoxyfenozide respectively in 2021 season. As, 62.71, 75.24, 78.16 and 86.51% for the previous insecticides, respectively in 2022 season. Statistical analysis proved that significant differences among these insecticides during the two seasons. Regarding B. tabaci, overall mean of reductions were 68.42, 81.11, 81.42 and 81.14% to abamectin, Malathion, dinotefuran and lambada-cyhalothrin, respectively in 2021 season. While, the means were 67.03, 81.96, 83.80 and 82.43% for the later insecticides during 2022 season. In such concern, the means were 64.30, 81.22, 82.63 and 82.88% for abamectin, Malathion, dinotefuran and lambada-cyhalothrin, respectively in 2021 season. Whereas in 2022 season, the means were 66.12, 81.97, 83.11 and 81.89% for these previous insecticides against aphid species populations.