Evaluation of a Preplant Method for Detecting Damage to Germinating Corn Seeds by Multiple Species of Insects
作者:
Roger R. Youngman,
David G. Midgarden,
D. Ames Herbert,
Kimberley H. Nixon,
Daniel E. Brann,
期刊:
Environmental Entomology
(OUP Available online 1993)
卷期:
Volume 22,
issue 6
页码: 1251-1259
ISSN:0046-225X
年代: 1993
DOI:10.1093/ee/22.6.1251
出版商: Oxford University Press
关键词: wireworms;seedcorn maggot;bait stations
数据来源: OUP
摘要:
Field studies were conducted in Virginia cornfields from 1989 to 1991 to evaluate a preplant method for detecting damage to germinating corn seeds by multiple species of insect pests, including seedcorn maggots,Delia platura(Meigen); several species of wireworms in the generaMelanotus, Conoderus, andAeolus; and several species of white grubs in the generaPopillia, Cyclocephala, Cotinis, andMaladera. The method used consisted of evaluating feeding damage to com seeds in wire-mesh traps (i.e., baited wire traps) that were buried in cornfields for ≍2 wk before planting. In the 1989 study conducted in a cornfield with a large infestation of wireworms, a significantly greater proportion of com seeds exhibited feeding damage in the baited wire traps (38.3%) compared with corn seeds planted by hand at conventional plant spacings (i.e., simulated commercial plantings) (31.5%). Further evaluation in 47 cornfields in 1990 and 1991 revealed no significant difference between the proportion of damaged corn seeds in the baited wire traps (2.7%) and simulated commercial plantings (2.0%). A Significantly greater proportion of com seeds exhibited feeding damage in the commercial plantings (5.4%) compared with the baited wire traps; however, mean stand loss associated with insect feeding in the commercial plantings was only 0.4%, which was substantially less than the proportion of damaged com seeds in the haited wire traps. Significant linear regressions were obtained between the proportion of damaged seeds in the baited wire traps and the proportion of damaged seeds in the simulated commercial plantings, commercial plantings, and proportion of stand loss in the commercial plantings. However, the lack of economic stand loss in the commercial plantings and low regression coefficient of determination precluded the development of a baited wire trap damage threshold to predict stand loss in fields subsequently planted with corn.
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