Control of witchweed Striga hermonthica by intercropping with Desmodium spp., and the mechanism defined as allelopathic
Control of witchweed Striga hermonthica by intercropping with Desmodium spp., and the mechanism defined as allelopathic
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DOI：
10.1023/a:1020525521180
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发表时间：
2002-09-01
影响因子：
2.3
通讯作者：
Woodcock, CM
中科院分区：
文献类型：
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作者：
Khan, ZR;Hassanali, A;Woodcock, CM
在对肯尼亚自给农业中玉米作物虫害控制的调查中，其中涉及与驱避植物间作，饲料豆类银叶（Desmodium uncinatum）和绿叶（D. intortum）也被发现显著减少寄生独脚金如独脚金对玉米的侵染。进一步的田间试验证实了这一效应，并显示出明显大于其他豆类，如大豆。例如，在一个实施例中，与此同时，产量也随之增加。土壤遮光和增施氮肥虽有一定的防效，但对水稻的防效影响不大。hermonthica侵染是D.观察钩突。在屏蔽室研究中，S。hermonthica感染时，获得的水溶液，从盆洗脱，其中D.的土壤中种植的玉米盆。赫尔蒙席卡。寄生杂草的生长几乎被完全抑制，而广泛的侵扰发生与控制杂草。D.化感作用的实验室研究。uncinatum，使用从清洁的根渗出的水溶性化学成分的样品，证明这涉及S.也是吸器发育抑制剂。
During investigations into the control of insect damage to maize crops in subsistence farming in Kenya, which involved intercropping with repellent plants, the fodder legumes silverleaf (Desmodium uncinatum) and greenleaf (D. intortum) were also found to reduce dramatically the infestation of maize by parasitic witchweeds such as Striga hermonthica. This effect was confirmed by further field testing and shown to be significantly greater than that observed with other legumes, e. g., cowpea, as were the concomitant yield increases. The mechanism was investigated, and although soil shading and addition of nitrogen fertilizer showed some benefits against S. hermonthica infestation, a putative allelopathic mechanism for D. uncinatum was observed. In screenhouse studies, a highly significant reduction in S. hermonthica infestation was obtained when an aqueous solution, eluting from pots in which D. uncinatum plants were growing, was used to irrigate pots of maize planted in soil seeded with high levels of S. hermonthica. Growth of the parasitic weed was almost completely suppressed, whereas extensive infestation occurred with the control eluate. Laboratory investigations into the allelopathic effect of D. uncinatum, using samples of water-soluble chemical components exuded from cleaned roots, demonstrated that this involved a germination stimulant for S. hermonthica and also an inhibitor for haustorial development.