Effects of Carbofuran and Water Stress on Growth of Soybean Plants and Twospotted Spider Mite (Acari: Tetranychidae) Populations Under Greenhouse Conditions

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Abstract
Growth of soybean plants and spider mite populations was examined as a function of carbofuran application rate (to the soil) and soil moisture status under greenhouse conditions. Water stress was the single most significant factor reducing both plant and mite population growth and mite intensity (mites per gram of leaf blade). At all rates, carbofuran tended to produce taller plants with significantly more nodes. At high rates, which made plants toxic to Mexican bean beetle adults (Coleoptera: Coccinellidae), carbofuran significantly reduced mite population growth relative to untreated plants. However, at low rates, which had little toxicity to Mexican bean beetle adults, carbofuran significantly increased spider mite population growth and led to higher intensities than were attained on untreated plants. Thus, as carbofuran titer in the field decreases after carbofuran application at planting for control of Mexican bean beetles, soybean plants may become more suitable for spider mite population growth and subsequent damage. High temperatures and water stress appeared to result in lower carbofuran titers in soybean plants.

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