Journal article
Interactions between Population Density of the Colorado Potato Beetle, Leptinotarsa decemlineata, and Herbicide Rate for Suppression of Solanaceous Weeds
Journal of insect science (Tucson, Ariz.), Vol.8(38), pp.1-10
2008
Handle:
https://hdl.handle.net/2376/106069
PMCID: PMC3127376
PMID: 20298117
Abstract
The presence of volunteer potato
Solanum tuberosum
L., cutleaf nightshade,
S. triflorum
N., and hairy nightshade,
S. physalifolium
Rusby (Solanales: Solanaceae), throughout potato crop rotations can diminish the effectiveness of crop rotations designed to control disease and pest problems associated with growing potatoes. In greenhouse bioassays, larvae of the Colorado potato beetle,
Leptinotarsa decemlineata
Say (Coleoptera: Chrysomelidae) were placed in population densities of 0, 5, 10, and 40 per potato (cv. Russet Burbank) plant and 0, 5, 10, and 15 per cutleaf nightshade and hairy nightshade plant. Plants were treated with different rates of herbicides including fluroxypyr, prometryn, and mesotrione rates, and the physiological response on the potato plants was assessed by weighing shoot biomass 14 days after treatment. Consistently, across all bioassays, rate response functions were shifted as
L. decemlineata
density increased, such that less herbicide was required to achieve control. For instance, the herbicide rate needed to achieve 90% reduction in potato biomass was reduced from 62 to 0 g fluroxypyr per hectare and 711 to 0 g prometryn per hectare as
L. decemlineata
density was increased to 40 larvae per plant. Herbivory at higher
L. decemlineata
population densities and herbicides above certain rates resulted in large reductions in cutleaf and hairy nightshade biomass. Differences in rate response functions among
L. decemlineata
population densities indicated that
L. decemlineata
contributed to weed suppression in combination with herbicides. These data suggest that integrated weed management systems targeting volunteer potato, cutleaf nightshade, and hairy nightshade can be more effective when herbicide applications are combined with herbivory by naturally occurring Colorado potato beetles.
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Details
- Title
- Interactions between Population Density of the Colorado Potato Beetle, Leptinotarsa decemlineata, and Herbicide Rate for Suppression of Solanaceous Weeds
- Creators
- Chase Metzger - Washington State University Long Beach Research and Extension Unit, 2907 Pioneer Rd, Long Beach, WA 98631Rick Boydston - USDA-ARS, Irrigated Agriculture Research and Extension Center, 24106 North Bunn Road, Prosser, WA 99350Holly Ferguson - Washington State University, Irrigated Agriculture Research and Extension Center, 24106 North Bunn Road, Prosser, WA, 99350Martin M Williams - USDA-ARS, 1102 S. Goodwin Avenue, University of Illinois, Urbana, IL 61801Richard Zack - Department of Entomology, Washington State University, Pullman, WA 99164Doug Walsh - Washington State University, Irrigated Agriculture Research and Extension Center, 24106 North Bunn Road, Prosser, WA, 99350
- Publication Details
- Journal of insect science (Tucson, Ariz.), Vol.8(38), pp.1-10
- Academic Unit
- WSU Prosser IAREC; Entomology, Department of
- Publisher
- University of Wisconsin Library
- Identifiers
- 99900546840501842
- Language
- English
- Resource Type
- Journal article