J. Kiptoo, M. Kasina, F. Wanjala, P. Kipyab, L. Wasilwa, M. Ngouajio, T. Martin
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引用次数: 7
摘要
摘要本研究于2011年3月至9月在肯尼亚KALRO Kabete和PTC (Practical Training Centre) Thika对低成本防虫网(lcPENs)进行了评估,以确定其在苗圃和田间生产水平上减少害虫侵害和提高白菜产量的效果。采用两种网目尺寸(0.9 mm和0.4 mm), 0.9 mm网目分别浸渍和未浸渍高效氯氰菊酯,通过杀虫剂的驱避作用来提高驱避效果。采用5个重复的完全随机区组设计,比较lcPENs的效率与无净使用和草地遮阳(农民实践)的效率。结果表明,在苗圃和田间水平上,lcPENs覆盖的白菜小菜蛾幼虫侵染率均显著降低(P<0.05)。苗圃中,经杀虫剂浸渍的lcPEN幼苗蚜虫数量显著降低(P<0.05),但在田间条件下,lcPEN与lcPEN之间无显著差异。lcPENs处理下白菜产量显著高于对照组(P<0.05)。研究结果清楚地表明,在lcpen下种植卷心菜的结果是高收入。然而,除了苗圃一级的蚊帐外,没有证据表明杀虫剂浸渍的作用增加。因此,农民可以使用普通的(未浸渍的)lcPENs来管理移栽卷心菜生产中的害虫。
Use of low cost pest exclusion nets can boost cabbage yield
ABSTRACT In this study, low-cost pest exclusion nets (lcPENs) were evaluated to determine their efficacy in reducing pest infestation and enhancing yields of cabbage at KALRO Kabete and PTC (Practical Training Centre) Thika, Kenya, from March to September 2011 both at nursery and field production levels. Nets of two-mesh sizes (0.9 mm and 0.4 mm) were used whereby the 0.9 mm net was either impregnated or not impregnated with alpha cypermethrin to enhance efficacy through repellency effects of the pesticides. The lcPENs efficiency was compared with no-net use and grass shading (farmer practice) in a completely randomized block design with five replications. Results showed that diamondback moth (Plutella xylostella) larval infestation was lower (P<0.05) on cabbages covered with lcPENs both at nursery and field level. At nursery, aphids were lower (P<0.05) on seedlings covered with insecticide-impregnated lcPEN but in field conditions, there was no difference among the lcPENs. Cabbage yield was higher (P<0.05) on cabbages grown under lcPENs. The findings clearly demonstrate high incomes as a result of growing cabbages under lcPENs. However, there was no evidence of an increased role for insecticide impregnation except in the nets at nursery level. Hence farmers can use ordinary (un-impregnated) lcPENs for pest management in transplanted cabbage production.