Entomologia Experimentalis et Applicata (2006) 120, 105-112

Yong-Lak Park and Jon J. Tollefson (2006)
Spatio-temporal dynamics of corn rootworm, Diabrotica spp., adults and their spatial association with environment
Entomologia Experimentalis et Applicata 120 (2), 105-112
Abstract: Multiyear and multilocation studies were conducted to investigate the within- and the between-year spatial dynamics of corn rootworms Diabrotica spp. (Coleoptera: Chrysomelidae), adults and their spatial associations with environmental factors in cornfields. Grid-based spatial sampling was conducted by trapping adults emerging from the soil (i.e., 'emergence-trap counts') and by counting the number of adults in the ear zone of corn plant (i.e., 'ear-zone count'). Spatial analysis with distance indices (SADIE) was used to determine spatial distribution patterns and to investigate spatial associations. Ear-zone counts and emergence-trap counts were spatially dynamic within a year and more frequently aggregated in the middle of growing seasons and random early and late in the season. However, during the peak population periods, spatial distribution of ear-zone counts and emergence-trap counts were significantly consistent between years, indicating predictability of future spatial distributions. Spatial distribution of emergence-trap counts and ear-zone counts were positively associated with soil moisture and presence of corn plants with silks, respectively. This study demonstrated that within-year spatial distribution patterns were dynamic and that there was between-year spatial consistency of corn rootworm adult distributions. Such information can be used to improve preventative management of corn rootworms.
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Link to article at publishers website
Database assignments for author(s): Yong-Lak Park

Research topic(s) for pests/diseases/weeds:
environment - cropping system/rotation
population dynamics/ epidemiology

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Diabrotica (genus)	Maize/corn (Zea mays)