Hari N S, Jindal J
Maize Entomology Laboratory, Department of Plant Breeding and Genetics, Punjab Agricultural University, Ludhiana, India.
Bull Entomol Res. 2009 Apr;99(2):131-7. doi: 10.1017/S0007485308006159. Epub 2008 Oct 24.
Two Napier millet (Pennisetum purpureumxP. glaucum) hybrids, namely PBN 83 and PBN 233 and one sorghum (Sorghum bicolor) variety, SL 44, were assessed for their potential role as a trap crop in the management of the stem borer, Chilo partellus (Swinhoe) (Lepidoptera: Crambidae) on maize. Oviposition preference and larval survival and development were determined for different test plants under laboratory and screen house conditions. Further, field dispersal of C. partellus larvae was assessed between Napier millet and maize crops. Results from no-choice and dual-choice tests indicated that Napier millet hybrids were preferred for oviposition over maize by C. partellus moths. Sorghum was, however, not preferred over maize in this respect. Napier millet hybrids were poor larval hosts, and a rapid decline in larval numbers was noticed within the first five days after hatching and virtually no larvae survived to pupation. Leaf area eaten by the borer larvae was significantly less on these hybrids than on maize or sorghum. Plant damage was more severe in maize and sorghum than Napier millet hybrids. No appreciable larval shift was noticed from Napier millet hybrids to the adjoining maize crop. The evaluated Napier millet hybrids, therefore, had potential for use as trap crop in C. partellus management. Sorghum, however, did not hold promise in this respect.
对两种象草（紫狼尾草×绿狼尾草）杂交种PBN 83和PBN 233以及一个高粱（双色高粱）品种SL 44作为诱集作物在玉米螟（Chilo partellus (Swinhoe)，鳞翅目：草螟科）防治中的潜在作用进行了评估。在实验室和网室条件下，测定了不同试验植物上的产卵偏好以及幼虫的存活和发育情况。此外，还评估了玉米螟幼虫在象草和玉米作物之间的田间扩散情况。无选择和双选择试验的结果表明，玉米螟成虫更喜欢在象草杂交种上产卵，而非玉米。然而，在这方面，高粱并不比玉米更受青睐。象草杂交种是较差的幼虫寄主，孵化后的头五天内幼虫数量迅速下降，几乎没有幼虫存活到化蛹阶段。螟虫幼虫在这些杂交种上啃食的叶面积明显小于在玉米或高粱上。玉米和高粱的植株损伤比象草杂交种更严重。未发现有明显的幼虫从象草杂交种转移到相邻的玉米作物上。因此，经评估的象草杂交种有潜力用作防治玉米螟的诱集作物。然而，高粱在这方面没有前景。
