Environmental Entomology (1991) 20, 749-754

Curtis A. Laub and John M. Luna (1991)
Influence of winter cover crop suppression practices on seasonal abundance of armyworm (Lepidoptera: Noctuidae), cover crop regrowth, and yield in no-till corn
Environmental Entomology 20 (2), 749-754
Abstract: Rye (Secale cereale L.), used as a winter cover crop, was killed by paraquat or by mowing with a bushog. In the early stages of subsequent no-till corn, abundance of armyworm, Pseudaletia unipuncta (Haworth), was lower in the mowed treatment compared with the sprayed treatment in three of five fields and did not differ in another field. Over the duration of the first armyworm generation, cumulative armyworm-days in the sprayed treatment were greater than in the mowed treatment in three of five fields and did not differ in another field. Mowing the cover crop was 40% less expensive than spraying. Competition from rye regrowth in the mowed treatment did not diminish yields. Corn silage yields were increased by mowing (P = 0.07), and the average increase in net benefit from mowing the cover crop compared with spraying was $91-113/ha. Cover crop mowing may be an economical and effective means of managing armyworm populations in no-till corn.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)

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

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Pest and/or beneficial records:

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