不同玉米品种的抗螟性研究

Studied on resistance of different maize varieties to corn and peach borners

田间调查了20个玉米品种心叶末期的螟害花叶指数和收获期茎秆及雌穗上的虫孔数、虫道数、虫道长、幼虫数.结果表明,各玉米品种之间的抗螟性存在明显差异,同一品种不同生育时期的抗螟性亦不相同.新单23、浚单22前期抗螟性强,而后期较弱.滑丰9号前期抗螟性较弱,但后期抗螟性较强.浚单20、郑农7278茎秆的螟害程度较轻,但雌穗的螟害程度较重.滑丰986、郑单958、张玉9号和浚单18整个生育期的抗螟性都较好.

Field investigations were conducted on the index of insect hole at late heart-leaf stage and number of insect hole,number of tunnel,tunnel length,number of larva in the stem and ear of 20 maize varieties at harvest time.The results showed that the resistance between different maize varieties to corn and peach borners had obvious difference,and that the same maize variety also had difference at different growth season.The resistance of Xindan 23 and Xundan 22 was strong in the earlier period, but was weak in the later period. The resistance of Huafeng 9 was weak in the earlier stage, but was strong in the later stage. The stem of Xundan 20 and Zhengnong 7278 had strong resistance, but the ear of them had weak resistance. The resistance of Huafeng 986, Zhengdan 958, Zhangyu 9 and Xundan 18 were better than other varieties in the whole growth season.