Use of Imidacloprid- Treated Row Mixtures for Colorado Potato Beetle (Coleoptera: Chrysomelidae) Management
Authors: DIVELY, G. P.; FOLLETT, P. A.; LINDUSKA, J. J.; RODERICK, G. K.
Source: Journal of Economic Entomology, Volume 91, Number 2, April 1998 , pp. 376-387(12)
Publisher: Entomological Society of America
Abstract:The "high dose" strategy of applying imidacloprid as an "at-planting" soil treatment uniformly throughout a potato field may result in rapid pest adaptation, as it has for other systemic insecticides. Alternatively, treated and untreated plants in a field provide a refuge to pests so that some portion of the population is not subjected to selection. In 1993- and 1994-field experiments involving potato cultivars with contrasting maturity periods, plots of mixtures of imidacloprid-treated and untreated rows were compared with plots of untreated and 100%treated rows to determine their effects on the Colorado potato beetle, Leptinotarsa decemlineata (Say). First-generation populations and feeding injury were significantly reduced by mixtures of imidacloprid treated rows, when post-diapause adults were released along the edge of plots to simulate a typical colonization pattern. Densities of life stages and percentage defoliation decreased as the proportion of imidacloprid-treated rows increased. The effectiveness of imidacloprid was greater than the additive effect based on the proportional contribution of the treated rows. Beetle populations decreased as the distance increased inward from the outer rows, because invading beetles were increasingly suppressed as they encountered rows of imidacloprid-treated plants. This suggests that the treated rows at the edge of the field in a row mixture acted as a toxic barrier to colonizing beetles. Even when colonizing adults were introduced uniformly in row mixture plots, the treated rows trapped many dispersing adults and suppressed feeding injury on adjacent untreated rows. Mixtures of treated and untreated rows deployed alone or in combination with a perimeter treatment are discussed as ways to reduce the amount and cost of insecticide used, create refuges to minimize resistance development, and reduce environmental risks.
Document Type: Research Article
Publication date: April 1998
- 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.
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