Efficacy of Abamectin against adult spider mite on tomato in Botswana

The efficacy of abamectin against the carmine spider mite (CSM) on tomato was studied in the laboratory at Botswana University of Agriculture and Natural Resources, Gaborone, Botswana. The acaricide was applied at five dosages, including the recommended label rate.

Each treatment was replicated three times. The results were analyzed using probit analysis where LD50 and LD90 values found with the acaricide were estimated at different assessment periods (24, 48, 72, and 96 hours) following application and used to determine the effectiveness of the acaricide. When the treatments were assessed at 24, 48, 72, and 96 h, LD90 values against spider mites were 0.82, 0.71, 0.69, and 0.64. This indicated that abamectin was highly effective against spider mites.

The slopes of the probit lines assessed at 24, 48, 72, and 96 h after application were 6.68, 6.97, 6.62, and 4.46. This indicates a rapid change in mortality with an increase in acaricide dosage. The study shows that abamectin can be a valuable component of integrated spider mite control programs under Botswana conditions. Further research and field testing are necessary to confirm these laboratory findings.

Read the complete research at www.researchgate.net.

Legwaila, Mitch & Obopile, Motshwari & Tiroesele, Bamphitlhi. (2022). Efficacy of Abamectin against adult spider mite, Tetranychus cinnabarinus (Acari: Tetranychidae) on tomato in Botswana. JOURNAL OF ENTOMOLOGY AND ZOOLOGY STUDIES. 10. 39-43. 10.22271/j.ento.2022.v10.i5a.9052. 

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