Efficacy of Cypermethrin, Neem Extract and Bacillus thuringiensis for Controlling Insect Pests of Vegetable Soybean

Authors

  • Md. Abdullah Department of Entomology, Faculty of Agriculture, Kasetsart University, Kamphaeng Saen Campus, Nakhon Pathom 73140, Thailand
  • Ouab Sarnthoy Department of Entomology, Faculty of Agriculture, Kasetsart University, Bangkok 10900, Thailand
  • Somchai Isichaikul Department of Entomology, Faculty of Agriculture, Kasetsart University, Kamphaeng Saen Campus, Nakhon Pathom 73140, Thailand
  • Siripan Tantakom Department of Entomology, Faculty of Agriculture, Kasetsart University, Kamphaeng Saen Campus, Nakhon Pathom 73140, Thailand

Keywords:

cypermethrin, neem extract, Bacillus thuringiensis, vegetable soybean, insect pests

Abstract

Field experiments were conducted during dry and wet seasons (1999-2000) at Kamphaeng Saen Campus of Kasetsart University, Nakhon Pathom, Thailand to evaluate the efficacy of cypermethrin 10 EC, neem extract (Azadirachtin 0.1%) and Bacillus thuringiensis var. kurstaki (53,000 SU/mg) in controlling the major insect pests of vegetable soybean. Melanagromyza sojae, Spodoptera litura, Spodoptera exigua, Helicoverpa armigera, Lamprosema indicata, Etiella zinckenella and Bemisia tabaci were the most abundant species in both seasons. Insecticides were sprayed at 10 days interval until harvest. Cypermethrin showed significantly better control among the treatments. Neem extract moderately suppressed the insect pests with statistically significant efficacy over the control. B. thuringiensis var. kurstaki showed less efficacy than neem extract but exhibited statistically significant efficacy over the control in most cases. Highest yield was recorded in cypermethrin treated plot (9.83 t/ha) followed by neem extract (8.39 t/h), B. thuringiensis var. kurstaki (7.98 t/ha) and control (6.22 t/ha) in dry season whereas yields were 5.83, 4.83, 4.0 and 2.83 t/ha for cypermethrin, neem extract, B. thuringiensis var. kurstaki and control in wet season, respectively. Additionally, Menochilus sexmaculatus and spider were found less in cypermethrin treated plots whereas in other treatments they were significantly higher in number.

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Published

2001-03-31

How to Cite

Abdullah, Md., Ouab Sarnthoy, Somchai Isichaikul, and Siripan Tantakom. 2001. “Efficacy of Cypermethrin, Neem Extract and Bacillus Thuringiensis for Controlling Insect Pests of Vegetable Soybean”. Agriculture and Natural Resources 35 (1). Bangkok, Thailand:14-22. https://li01.tci-thaijo.org/index.php/anres/article/view/240315.

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Section

Research Article