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Insecticide resistance in Colorado potato beetle, Leptinotarsa decemlineata (Say), in Michigan was first reported in 1984 but caused severe economic problems beginning in 1991. Surveys conducted by the Michigan Potato Industry Commission and Potato Growers of Michigan from 1991 through 1994 document the increased Colorado potato beetle control costs and yield losses resulting from insecticide resistance. In 1991 and after, statewide mean control costs were as high as $306/ ha; costs for districts most seriously affected were as high as $412/ha. This is in contrast to $35-74/ha in the upper peninsula of Michigan, where resistance is not a problem. Yield losses were as high as 12.2% statewide and as high as 20.5% in seriously affected districts. Costs plus losses to the industry were $13.3 million in 1994 (13.7% of crop value). In response to these losses, nearly 100% of the crop was under some type of integrated pest management program. Scouting (96% of crop area) and crop rotation (78% of crop area) were the most common integrated pest management practices. The introduction of new insecticides may reduce or eliminate yield losses. However, costs of resistance will continue to accrue because relatively inexpensive insecticides are no longer effective and newly developed products are up to 5 times more costly. Long-term increased cost to the Michigan industry caused by insecticide resistance in Colorado potato beetle is estimated at $0.9 to $1.4 million/yr ($44 to $69/ha; $18 to 28/acre).
Document Type: Research Article
Publication date: October 1, 1997
More about this publication?
Journal of Economic Entomology is published bimonthly in February, April, June, August, October, and December. The journal publishes articles on the economic significance of insects and is divided into the following sections: apiculture & social insects; arthropods in relation to plant disease; forum; insecticide resistance and resistance management; ecotoxicology; biological and microbial control; ecology and behavior; sampling and biostatistics; household and structural insects; medical entomology; molecular entomology; veterinary entomology; forest entomology; horticultural entomology; field and forage crops, and small grains; stored-product; commodity treatment and quarantine entomology; and plant resistance. In addition to research papers, Journal of Economic Entomology publishes Letters to the Editor, interpretive articles in a Forum section, Short Communications, Rapid Communications, and Book Reviews.