Enhanced the activity of insecticides of Mospilan and Sivantoby Zinc Oxide Nanoparticles to control Phenacoccus solenopsis(Hemiptera: Pseudococcidae)

Abstract

      The mealybug, Phenacoccus solenopsis is one of the extreme agricultural pests. In this study a series of field and laboratory experiments were conducted to evaluate the efficacy of zinc oxide nanoparticles and chemical pesticides Mospilan, Sivanto and Ovitex oil and their combinations against adults of Phenacoccus solenopsis, cotton mealybug. Laboratory study results showed that the corrected percentage of adult mortality of P. solenopsis when using zinc oxide nanoparticles (ZnO-NPs) at concentrations of 25, 50 and 75 ppm was 34, 40 and 48%. The results also confirmed that loading ZnO-NPs at 25, 50 and 75 ppm with Mospilan at the recommended concentration (0.5g/L) caused 50, 62 and 75% mortality, respectively. The use of ZnO-NPs at 25, 50, and 75ppm with Sivanto at the recommended concentration (1ml/L) affected the adults by 54, 67.5, and 73.3%, respectively, after 72 hours of treatment. The results of field evaluation of control treatments ZnO-NPs, Mospilan, Sivanto, ZnO -Mospilan, ZnO - Sivanto, Ovitex, Ovitex + Sivanto, Ovitex + Mospilan, in the spring season 2023 showed that decrease on the numerical density of adults the mealybug, Phenacoccus solenopsis in the field of okra. Tthe average number density of adults reached 1.733, 1.686, 1.752, 1.200, 1.543, 1.633, 1.576, 1.471 adult / leaf, respectively. These results suggest that applying ZnO-NPs, ZnO - ZnO -Mospilan and ZnO – Sivanto can be used as an eco-friendly controlling strategy for P. solenopsis.