滇西南植胶区橡胶树白粉病发生规律

Occurrence of Powdery Mildew on Hevea brasiliensis in Southwest Yunnan

对滇西南植胶区橡胶树白粉病进行了定点定期观测,对其发生规律与消长进行了调查。结果表明,滇西南植胶区橡胶树白粉病抽芽期开始发生,古铜期、淡绿期发病率和病情指数逐渐升高,稳定期发病率和病情指数逐渐下降,病害流行过程符合S型流行曲线。临沧地区橡胶树物候早于德宏地区,且历期较短,白粉病发病早。掌握滇西南植胶区橡胶树白粉病发病规律,可为橡胶树白粉病的监测和防治提供参考依据。

An attempt was made to observe regularly the occurrence, development and disappearance of powdery mildew of Hevea brasiliensis in positioned locations in rubber plantations in the southwest Yunnan. The results showed that powdery mildew of H. brasiliensis began to occur at the bud-burst stage in the southwest Yunnan. The incidence and disease index increased gradually at the bronze leaf and pale green leaf stages, and then decreased gradually at the bright green (mature) leaf stage. The disease prevalence showed a “S” curve. The rubber trees have an earlier and shorter phenophase and is infected earlier by powdery mildew in the Lincang area than in the Dehong area, Yunnan Province. These results will provide some reference for monitoring and controlling of the powdery mildew of H. brasiliensis.