标题：The Effectiveness of Home Made Organic Pesticides Derived from Wild Plants (Solanum pindiriforme and Lippia javanica), Garlic (Allium sativum) and Tobacco (Nicotiana tobacum) on Aphid (Brevicoryne brassica) Mortality on Rape (Brassica napus) Plants
期刊名称：Research Journal of Environmental and Earth Sciences
印刷版ISSN：2041-0484
电子版ISSN：2041-0492
出版年度：2011
卷号：3
期号：5
页码：457-462
出版社：Maxwell Science Publications
摘要：A trial was carried out at the Horticulture Research Centre, Marondera, Zimbabwe in 2007 to find out the effect of organic pesticides derived from 2 local plants ( Solanum pindiriforme and Lippia javanica ), garlic ( Allium sativum ) and tobacco ( Nicotiana tobacum ) on aphid mortality on a rape ( Brassica napus ) crop. Rape seedlings were raised in a screen house in potting media made from pine bark and vlei soil. Seedlings were transplanted into the field at seven weeks after planting. The design of the experiment was a randomised complete block (RCBD) replicated three times. Rape plants were infested with 10-12 aphids per plant at three weeks after transplanting. Organic pesticides prepared from Solanum (spray and buttermilk), Lippia (spray), garlic (buttermilk, garlic and chilli spray) and tobacco (spray) were sprayed on selected plants that were highly infested with aphids at 10 weeks after aphid infestation. The control was unsprayed infested plants. Buttermilk was mixed with paraffin. The results of aphid mortality obtained at 12 days after spraying indicated that plants sprayed with Solanum (spray and buttermilk), and garlic buttermilk had 100% mortality, Lippia spray, garlic and chilli spray and tobacco spray had 77, 70 and 10% aphid mortality, respectively. The control plants had 0% mortality. This shows that local wild plants ( Solanum and Lippia ) and garlic can be prepared into formulations that can control aphids on rape plants and therefore can be used as organic pesticides.
