化州市近十年稻纵卷叶螟重发原因浅析及防治对策

Analysis on the causes of outbreaks and control strategy of the Cnaphalocrocis medinalis(Guenée)in Huazhou in recent ten years

为了更好地总结稻纵卷叶螟的发生危害规律,改善和提高稻纵卷叶螟的监控技术水平,对广东省化州市历年稻纵卷叶螟测报资料进行总结分析。所得结果表明,近10年稻纵卷叶螟表现出明显的新特点:发生期显著提早;次害代发生重,重发世代增多;暴发频率加快,对水稻为害进一步加剧。剖析其原因,主要是气候有利、种植方式改变、抗药性增强等。总结提出了加强虫情测报,调整防治策略和农业防治,选用正确药剂,改进施药技术等防治对策。

The forecast data on Cnaphalocrocis medinalis （Guen6e） outbreaks in the recent 10 years in Huazhou was summarized and analyzed. The results indicated that some new trends have emerged over the last decade. Cnaphalocrocis medinalis （Guen6e） appeared significantly earlier than they previously did, the number of the secondary pests and repeat generations has increased, the frequency of outbreaks has increased, all of these leaded greater damage to rice crops. These changs can be attributed to the more favorable climatic conditions, changes in horticultural practices, enhanced resistance to drugs and inappropriate control measures. It is necessary to strengthen forecasting , adjust preventive treatment, improve pesticide selection and application methods.