Journal of the Kansas Entomological Society (1999) 72, 214-221

B.E. Hibbard, B.D. Barry, L.L. Darrah, J.J. Jackson, L.D. Chandler, L.K. French and J.A. Mihm (1999)
Controlled field infestations with western corn rootworm (Coleoptera : Chrysomelidae) eggs in Missouri: Effects of egg strains, infestation dates, and infestation levels on corn root damage
Journal of the Kansas Entomological Society 72 (2), 214-221
Abstract: Western com rootworm, Diabrotica virgifera virgifera LeConte, feeding damage to corn roots resulting from different combinations of rootworm strains, infestation times, and infestation levels was evaluated in two factorial experiments. Each experiment was setup in a randomized complete block design with four replications and was repeated over three Missouri environments (one environment included both experiments). The combination of the two factorial experiments evaluated three sources of the western corn rootworm eggs (a nondiapausing lab strain, a diapausing lab strain, and a field strain), three infestation times (planting, 2-leaf stage, and 5-leaf stage), and two infestation levels (600 and 1200 eggs/30.5 cm) in a total of five environments which spanned three different years. The damage caused by the diapausing strain was not significantly different from damage, caused by the field strain in any of the environments or the combined analysis. The nondiapausing strain caused significantly more damage than the diapausing strain or the field strain in the 1995 environment, but caused significantly less damage than the field strain in the 1996 Hinkson Valley environment. The infestation of 1200 viable eggs/30.5 cm caused significantly more damage than the infestation of 600 viable eggs/30.5 cm in one experiment, but not in the other. The planting-time infestation caused significantly more damage than infestation at the 2-leaf stage, and infestation at the 2-leaf stage caused significantly more damage than infestation at the 5-leaf stage.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Database assignments for author(s): Bruce E. Hibbard, Laurence D. Chandler

Research topic(s) for pests/diseases/weeds:
damage/losses/economics

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Diabrotica virgifera	Maize/corn (Zea mays)	U.S.A. (mid N)