Performance of the Russian Wheat Aphid (Homoptera: Aphididae) on Perennial Range Grasses: Effects of Previous Defoliation
作者:
Frank J. Messina,
Thomas A. Jones,
Dale C. Nielson,
期刊:
Environmental Entomology
(OUP Available online 1993)
卷期:
Volume 22,
issue 6
页码: 1349-1354
ISSN:0046-225X
年代: 1993
DOI:10.1093/ee/22.6.1349
出版商: Oxford University Press
关键词: Diuraphis noxia;Aphididae;defoliation
数据来源: OUP
摘要:
We determined whether early-season defoliation of range grasses affected the subsequent suitability of these plants for the Russian wheat aphid,Diuraphis noxia(Mordvilko). Grazing was simulated by clipping six grass species in northern Utah in April 1992. Aphid population growth was higher on clipped plants than on control plants, especially during theoversummeringperiod when aphids may rely on range grasses as alternate hosts. Aphids suffered complete mortality on 28% of control plants during this period but failed to establish themselves on only 2% of clipped plants. Defoliation increased plant nitrogen and water content, and differences in total nitrogen between clipped and control plants were positively correlated with differences in aphid density. Spring grazing may generally increase the susceptibility of grasses toD. noxia; an exception to this pattern was Indian ricegrass, which responds to defoliation by greater reproduction instead of rapid vegetative growth.
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