Ultra-low-volume Spray Application on Cotton in Malawi
作者:
G.A. Matthews,
期刊:
PANS Pest Articles & News Summaries
(Taylor Available online 1973)
卷期:
Volume 19,
issue 1
页码: 48-53
ISSN:0030-7793
年代: 1973
DOI:10.1080/09670877309412731
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
Farmers in Africa often have only one or two hectares of cotton and use conventional knapsack sprayers to apply insecticides in 56–224 1 water/ha; in Malawi farmers have obtained yields averaging 1000 kg seed cotton per hectare. As water supply is a major problem ultra-low-volume application with a small battery-driven spinning disc sprayer is being evaluated with encouraging results although costs are slightly higher than for conventional spray application. 25% carbaryl and 40% DDT to controlDiparopsis castaneaHmps andHeliothis armigeraHbn respectively are applied according to assessments of insect populations by routine scouting, with dimethoate added as required as aphicide-acaricide. Spray is fed to the spinning disc at 0.5 ml/sec and swath width decreased from six to two rows during the season. On a two-row swath (1.8 m) when plants exceed 50 cm height, 2.5 1 of spray are applied per hectare.
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