Author
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Naranjo, Steven |
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ELLSWORTH, PETER - UOFA, MAC, MARICOPA, AZ |
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Submitted to: Bemisia International Workshop Proceedings
Publication Type: Abstract Only Publication Acceptance Date: 12/4/2006 Publication Date: N/A Citation: N/A Interpretive Summary: Technical Abstract: Selective insecticides promote the critical role of biological control in the successful management of Bemisia tabaci in the Arizona Cotton IPM program. A number of putatively selective insecticides have been introduced in recent years, but their potential role in replacement or alternative IPM strategies are unknown. Field studies were undertaken to quantify the selectivity of several new compounds for management of whitefly and another key cotton pest Lygus hesperus. Acetamiprid for whitefly control was only moderately selective compared with broad-spectrum materials and known selective insect growth regulators (IGRs). Spiromesifen was shown to be equally selective to the IGRs but that selectivity may be dosage dependent. Several new insecticides (flonicamid and metaflumizone) for Lygus control also appear selective and will reduced insecticide side effects in the overall IPM system. Results have led to revision of recommended chemistry within the cotton IPM program. Low to moderate doses of spiromesifen are suggested as an alternative to the IGRs in Stage I of the plan where selectivity is of critical importance. Acetamiprid is suggested for use in Stage II of the IPM plan which promotes the rotation of chemistry across the season, provides for the usage of insecticides with low to moderate levels of selectivity, and eliminates the usage of broad-spectrum materials such as pyrethroids until late in the growing season. Use of selective materials for Lygus will enhance the whitefly IPM program. |
