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九月上中旬水稻主要病虫害发生情况与防治意见
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一、当前发生情况:

1、稻飞虱:预计六(4)代稻飞虱以褐飞虱为主的种群总体中等发生,部分田块偏重发生,低龄若虫高峰期分别在9月上旬前期和9月中旬中期。

依据:①灯下迁入峰次少,迁入虫量较低:灯下截止8月28日,累计诱虫量163头(其中褐飞虱比例为26.4 %),只有去年同期11.3 %,是前三年同期均值的3%。近期无明显峰次。田间总体虫量不高,但田块间差异大,成虫比例偏高,褐飞虱短翅型成虫量较大:据我站8/30-31日在破凉、凉亭、河塌等地普查,稻飞虱平均百丛虫量为475(10-2960)头,其中褐飞虱占94.7%,成虫占31.2%,褐飞虱短翅型成虫平均百丛虫量为44(0-220)头。近日各测报基点调查,平均百丛虫量 325头,个别防治不力田块达万头以上,已出现“冒穿”现象。稻飞虱是一种具有迁飞性、暴发性和毁灭性的害虫,防治不力将造成重大损失,甚至绝收。近期气候条件有利于稻飞虱的发生。                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         

2、穗期病害:预计穗期病害在迟单及双晚上偏重发生。

依据:1、田间菌源广泛:稻曲病、稻瘟病已成为我县水稻常发性病害,发生程度呈上升趋势;稻瘟病一直在感病品种上发生普遍,种子带菌率和田间残留菌量较高。2、感病品种种植面积较大:目前我县主栽的品种大多不抗稻瘟病。3、气候条件:据县气象部门预报,9月上旬有明显的连续阴雨过程,对穗期病害的发生极为有利。

二、防治技术意见:各乡镇农技站必须高度重视,深入田间普查病虫情,并宣传发动种植大户及农户组织防治,确保稳产高产。

1、防治适期:①稻飞虱达标田块立即用药防治,无水田块用敌敌畏拌土撒施。②9月3-5日预防迟熟单晚穗期病害,查治六(4)代稻飞虱、稻纵卷叶螟,兼治三代二化螟。9月中旬中期主治六(4)代稻飞虱,预防双晚田穗期病害,查治双晚田稻纵卷叶螟等其它病虫害。

2、防治指标见上期水稻情报。

3、防治药剂:①稻纵卷叶螟、二化螟:四氯虫酰胺(9080)、氯虫苯甲酰胺、阿维·氯苯酰、阿维·茚虫威等。②稻飞虱:烯啶虫胺、、呋虫胺、吡蚜酮、烯啶·吡蚜酮。③纹枯病: 20%烯肟·戊唑醇(爱可)、肟菌·戊唑醇、30%己唑醇、井·蜡蚜等。④稻曲病:30%己唑醇、戊唑醇、井·蜡蚜、井冈·烯唑醇等。⑤稻瘟病:稻瘟灵、三环唑、咪鲜胺、春雷霉素等。

4、防治方法:根据不同类型田相应防治对象合理选用上述药剂按推荐用量对水45公斤均匀喷雾,同时田间保持一定水层5天以上。