Studies on the economic threshold level of mustard aphidLipaphis erysimi(Kaltenbach) on the radish seed crop in India
作者:
D. S. Batht,
Darshan Singh,
期刊:
Tropical Pest Management
(Taylor Available online 1989)
卷期:
Volume 35,
issue 2
页码: 154-156
ISSN:0143-6147
年代: 1989
DOI:10.1080/09670878909371346
出版商: Taylor & Francis Group
关键词: economic threshold;Lipaphis erysimi;radish seed crop
数据来源: Taylor
摘要:
The economic threshold level of the mustard aphid,Lipaphis erysimi(Kaltenbach) was determined on the radish seed crop, var Punjab Sufed. Spraying oxydemeton methyl at 300 g a.i./ ha, was monitored at arbitrary set aphid levels from 25 to 150 aphids/plant. The maximum cost benefit ratio (1: 13.1) was achieved at an aphid level of 50 per plant, requiring three sprays. Spraying in the middle of February was the most crucial, as delay of 7 days from this stage resulted in significant decreases in yield in the fixed spray schedule and at the 75‐aphid level.
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