湖北江汉稻区优质香稻上二化螟的为害特性

研究了二化螟Chilo suppressalis(Walker)对优质香稻鄂香1号和武香988及优质常规中稻鄂中5号的田间为害特性。结果显示,1代二化螟危害造成的枯心苗数优质香稻略低于优质常规中稻。2代二化螟危害造成的枯孕穗和白穗优质香稻鄂香1号低于常规中稻,平均每15丛7.91株。田间剥查发现优质香稻中4~5龄2代二化螟所占百分比高于常规中稻,武香988中2代二化螟蛹所占比例高于常规中稻,达46.51%。3代二化螟量优质香稻低于常规中稻。结果说明香稻受二化螟的危害集中在2代,因而香稻二化螟的防治应注意消灭1代老熟幼虫和2代幼虫。

Damages of striped stem borer, Chilo suppressalis on high-quality scented rice in Jianghan area, Hubei

Damages of striped stem borer (SSB), Chilo suppressalis (Walker) on high-quality scented rice, Exiang-1 and Wuxiang 988, and on high-quality conventional rice Ezhong-5 were studied. The results showed that the amount of perished tender sprouts caused by the first generation larvae of SSB was slightly lower on scented rice than on conventional rice. Plants with gestated paddies and mature paddies damaged by the second generation larvae of SSB were detected high on conventional rice, but were only 7.91 plants/15 cluster on Exiang-1. In field investigation higher amount of the second generation larvae in 4～5 instars was observed on scented rice not on conventional rice. And then the maximal pupae amount was found on Wuxiang 988, which was amount to 46.51%. The population of SSB of the third generation on scented rice was smaller than on conventional rice. These results suggest that the management of SSB for scented rice should pay more attention on the mature larvae of the first generation and larvae of the second generation.