抗玉米蚜玉米内生菌的筛选

为探索防治玉米蚜的新方法，从山东省玉米主产区玉米植株上分离获得61株内生菌菌株，室内测定了对玉米蚜的防治效果，筛选出高效菌株，并测定了菌株对玉米生长的影响及在玉米植株内的定殖率。结果显示，白僵菌属菌株YC1和链格孢属菌株GX5对玉米蚜的防治效果最好，均为74.80%，无虫株率分别为32.22%和55.64%；接入菌株YC1和GX5后玉米各组织的生物量均大于对照，菌株YC1处理组的根、茎、叶干重分别增长了9.64%、15.71%和20.51%，菌株GX5处理组的根、茎、叶干重分别增长了3.88%、8.16%和9.14%；菌株GX5在玉米根、茎、叶中的定殖率可以达到44.23%以上，菌株YC1在玉米茎中的定殖率可以达到63.44%，有较大的应用价值。

Screening of Corn Endophyte Strains against Rhopalosiphum maidis

To explore new strategies for sustainable control of corn aphid Rhopalosiphum maidis (Fitch) population, 61 endophyte strains were collected from the major corn producing areas in Shandong province, and their control efficacies against R. maidis were determined under laboratory conditions to screen the highly effective strains. Meanwhile, the effects and rates of colonization of the strains in different tissues of corn were detected. The results showed that strains YC1 and GX5 had the best control efficacy of 74.80%, with rates of no-damage plants of 32.22% and 55.64%, respectively. The biomass of corn tissues inoculated with stains YC1 and GX5 were higher than the control, dry weight of the root, stem and leaf of the YC1 treatment group increased by 9.64%, 15.71% and 20.51%, respectively, and that of the GX5 treatment group increased by 3.88%, 8.16% and 9.14%, respectively. The colonization rates of strain GX5 in roots, stems and leaves were more than 44.23%, and the colonization rate of YC1 in stems was more than 63.44%. The results show that the strains GX5 and YC1 have great application potential.