Movement of Neonate Fall Armyworm (Lepidoptera: Noctuidae) Larvae on Resistant and Susceptible Genotypes of Corn
作者:
Guang Yang,
B. R. Wiseman,
Karl E. Espelie,
期刊:
Environmental Entomology
(OUP Available online 1993)
卷期:
Volume 22,
issue 3
页码: 547-553
ISSN:0046-225X
年代: 1993
DOI:10.1093/ee/22.3.547
出版商: Oxford University Press
关键词: Spodoptera frugiperda;larval behavior;host plant resistance
数据来源: OUP
摘要:
Genotypes of field-grown corn,Zea maysL., known to vary in their resistance to fall armyworm,Spodoptera frugiperda(J. E. Smith), were used in a study designed to examine the movement of neonate larvae. Movement of larvae was examined on corn plants at the midwhorl (the 8th leaf; V8) stage and the late-whorl (12th leaf; V12) stage. There was little difference in the movement of larvae when they were on resistant ‘MpSWCB–4’ compared with when they were on the susceptible genotype ‘Pioneer 3369A.’ However, larvae reached the feeding sites (whorl tissue) more quickly when they were placed on the younger (upper) leaves than when they were placed on the older (lower) leaves. When larvae were collected from resistant and susceptible genotypes 24, 48, and 96 h after artificial infestation, there were consistently fewer larvae on the resistant genotype only after 96 h. Populations of larvae decreased more rapidly when the plants were infested in the late-whorl stage than when the plants were infested in the midwhorl stage.
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