设施条件下微型马铃薯晚疫病流行动态研究

目的]对设施条件下微型马铃薯晚疫病的流行动态进行研究。方法]在保护地微型马铃薯幼苗上人工接种马铃薯晚疫病病菌,结合逐日天气变化和保护地内逐小时温湿度变化进行观察。结果]保护地微型马铃薯晚疫病侵染高峰日的日温度变化在11.5～24.0℃之间,日最低相对湿度高于95%,日降雨累积时间至少8 h以上。结论]设施条件下马铃薯晚疫病流行动态呈跳跃式发展,气象条件合适时,病原菌会在1 d之内大量产孢和严重侵染。

Study on the Epidemic Tendencies of Potato Late Blight in Protected Field

Objective] The aim was to study epidemic of potato late blight in protected field.Method] The meteorological date in the greenhouse was collected daily through the whole growing season after the P.infestans infected.Result] The crucial weather condition for highly sporulation and severe infection of P.infestans is defined as a period of 24 hours with: ① the air temperature ranging is from 10 ℃ to 25 ℃;② the lowest relative humidity is higher than 95%;③ the accumulated precipitation time is longer than 8 hours.Conclusion] The result showed that the disease progress curve developed in a jumping way.When the meteorological condition was met,P.infestans would produce lots of sporangia and infect the potato severely within one day.Lower temperature and higher relative humidity are beneficial to the disease.