Evaluation on the Borer-resistance of Different Corn Varieties
Zhu Qiu-yun · Anhui nongye kexue · 2008
[Objective] The study aimed to confirm the insect-resistance differences among corn varieties to establish suitable control measure. [Method] Under conditions of infecting insects naturally, 16 corn varieties planted broadly in Liaoning were conducted for insect-resistance investigation in field. [Result] The leaf feeding scales of the first generation borers on Danyu 2151, Dongdan 16, Dongdan 60, Lianyu 19, Danyu 46 and Shenshi 31 were 1~3-grade and that on Haihe 10, Shenshi 29, Dnayu 39, Haihe 13 and Shendan 13 were 3.1~6.0-grade. The damaged rates of female ears of Shendan 17, Lianyu 15, Shendan 13, Tiedan 10, Tiedan 12 and Dongdan 7 reached more than 50 %, that of Shenshi 31, Danyu 2151 and Dongdan 16 were below 30 % and that of the other varieties were 31 %～49 %. The borer hole number per stem of Shenshi 31 was only 1.68 and that of Danyu 2151 and Dongdan 60 were 2~3. The yields of Shendan 17, Tiedan 10, Tiedan 12 and Dongdan 7 had significant difference from that of Shenshi 31 and Danyu 2151. [Conclusion] There was borer-resistance difference among different corn varieties, the most of which were sensitive to the second generation borer. Shenshi 31, Danyu 2151, Dongdan 16, Dongdan 60, Dan 60, Lianyu 19, Danyu 46, Haihe 10 and Shenshi 29 were resistant to the first generation borer and also had better resistance to the second generation borer.