Seasonal Incidence of Aphids and the Aphid ParasitoidDiaeretiella rapae(M'Intosh) (Hymenoptera: Aphidiidae) on Rapeseed in Tennessee
作者:
Michael L. Boyd,
Gary L. Lentz,
期刊:
Environmental Entomology
(OUP Available online 1994)
卷期:
Volume 23,
issue 2
页码: 349-353
ISSN:0046-225X
年代: 1994
DOI:10.1093/ee/23.2.349
出版商: Oxford University Press
关键词: Lipaphis erysimi;Diaeretiella rapae;rapeseed
数据来源: OUP
摘要:
Aphids and their parasitoids were sampled in seven and eight commercial rapeseed fields in 1990 and 1991, respectively. Whole-plant sampling was used for aphids during the budding plant stage. Sweep-net sampling was used for aphids and their parasitoids during the flowering and ripening plant stages. Three species of aphids, turnip aphid,Lipaphis erysimi(Kaltenbach); green peach aphid,Myzus persicae(Sulzer); and cabbage aphid,Brevicoryne brassicae(L.), were collected. The turnip aphid was the most abundant species collected in 1990 and 1991, 99.9 and 86.8%, respectively. Turnip aphid populations peaked (80%) most frequently during the flowering stage, and visual observations taken of feeding damage noted stunted growth, reduced pod formation, and uneven stand maturity. Turnip aphids were parasitized by the wasp parasitoid,Diaeretiella rapae(M'Intosh) (Hymenoptera: Aphidiidae). In 1990, the totalD. rapaedensity was 883 wasps per 50 sweeps and this was 24 times higher than the total 1991 density of 37 wasps per 50 sweeps. Aphid infestations were observed to cause substantial damage to rapeseed stands in 1990. However, the lack of quantitative yield-loss data precludes the effective integration of natural and chemical control strategies on rapeseed.
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