不同种植密度对留茬膜侧秋马铃薯病虫害的影响

Investigation on Diseases and Insect Pests of Autumn Potato in Side Form Stubble Field under Different Planting Densities

调查了不同种植株行距下,留茬膜侧秋马铃薯的病株率和虫株率,结果表明,本次调查发现马铃薯虫害、病害共8种,分别为马铃薯二十八星瓢虫(Henosepilachna vigintioctomaculata Motschulsky)、茶黄螨(Polyphagotarsone-mus latus Banks)、茄无网蚜[Acyrthosiphon solani(Kaltenbach)],马铃薯生理性卷叶病、马铃薯病毒病(PVY)、马铃薯晚疫病(Phytophthora infestans Mont)、马铃薯软腐病(Erwinia carotovora subsp.)和马铃薯早疫病(Alternaria solani So-rauer),且病虫害的总发生率随着马铃薯种植密度的增加而增大,当行距30 cm、株距20 cm时,马铃薯产量最高。

We investigated the diseased plant rate and the insect-infected plant rate of autumn potato in side form stubble field under different planting densities. The results showed that eight diseases and insect pests were found, including Henosepilachna vigintioctomaculata Motschulsky, Polyphagotarsonemus latus Banks, Acyrthosiphon solani （Kahenbach）, potato physiologic leaf roll disease, PVY, Phytophthora infestans Mont, Erwinia carotovora subsp, and Alternaria solani Sorauer. The total incidenee rate of diseases and insect pests was increased as the plant density increased, and the treatment three, with the row spacing of 30 cm and plant spacing of 20 cm, possessed the maximum yield.