ABSTRACT

This study sought to evaluate the oviposition responses of Chilo partellus (Lepidoptera: Crambidae) on maize plants exposed to Brachiaria brizantha Stapf following oviposition by C. partellus and nonexposed maize. Two Kenyan maize landraces (Jowi and Nyamula), Latin America landrace (Cuba 91) and WH505 (hybrid variety) (control) were studied. The result demonstrated that C. partellus deposited a significantly lower number of eggs and egg batches on Nyamula, Jowi and Cuba 91 maize plants exposed to B. brizantha with C. partellus eggs compared to nonexposed ones and the exposed hybrid variety. This was because they emitted electrophysiologically active compounds such as (E)-4, 8-dimethyl-1, 3, 7-nonatriene, decanal, (E)-caryophyllene, linalool, linalool (plus nananal), E-β-fernesene, methyl salicylate and (3E, 7E)-4, 8, 12-trimethyl-1, 3, 7, 11-tri-decatetraene that deterred C. partellus from ovipositing more eggs on these plants. Therefore, herbivore-induced plant volatiles (HIPVs) of B. brizantha can be employed to protect the maize crop against C. partellus.

摘要

本研究旨在评估的产卵反应二化螟partellus（鳞翅目：草螟科）暴露于玉米植株臂形brizantha麻黄继产卵C. partellus和非暴露玉米。研究了两个肯尼亚玉米地方品种（Jowi和Nyamula），拉丁美洲地方品种（古巴91）和WH505（杂交品种）（对照）。结果表明，C. partellus沉积在Nyamula，Jowi和古巴暴露于91种玉米植物一个显著较低数量的蛋和蛋批次B. brizantha与C. partellus蛋相比非暴露那些和暴露的杂交品种。这是因为它们释放了电生理活性化合物，例如（E）-4、8-二甲基-1、3、7-壬二烯，癸醛，（E）-石竹烯，芳樟醇，芳樟醇（加上萘醛），E -β-蕨烯，水杨酸甲酯和（3E，7E）-4， 8，12三甲基1,3，7，11三decatetraene即阻止C. partellus从产卵这些植物更多的蛋。因此，可使用草食动物诱导的B. brizantha的植物挥发物（HIPVs）保护玉米作物免受C. partellus侵害。