Effectiveness of Plant Extracts in the Control of Bemisia tabaci Gennadius in Zucchini Squash

Resumen

Objective: To determine the effectiveness of plant extracts in the control of Bemisia tabaci in zucchini squash. Design/methodology/approach: An open-field experiment was established in zucchini squash using a randomized complete block design with plastic mulch. The incidence of Bemisia tabaci adults, nymphs, and eggs was determined through direct monitoring on the underside of leaves treated with different plant extracts at doses of 10 mL and 3 mL. In addition, the percentage efficacy of the extracts was calculated. The incidence of silverleaf symptoms and plants exhibiting viral symptoms was assessed using a visual scale. Finally, zucchini yield was determined by weighing the fruits obtained from each treatment. Results: Statistically significant differences were detected in the incidence of B. tabaci adults, nymphs, and eggs among treatments with plant extracts, with the Mixxert treatment standing out as the most effective in controlling the insect and also producing the highest fruit yield. No differences were observed among the evaluated treatments in the number of silvered leaves or plants with viral diseases. Limitations on study/implications: The use of some plant extracts affects beneficial fauna in zucchini cultivation. Findings/conclusions: The Mixxert extract was the most effective for the control of adults, nymphs, and eggs, recording the lowest incidence of B. tabaci in zucchini plants, with efficacy values of 54%, 96%, and 95%, respectively.