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病虫情报
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抓住关键时期,做好水稻病虫害的防治
作者: 来源: 责任编辑: 发布时间:2023-06-04 00:16 点击率:

农作物病虫情报
浙江省遂昌县植保站
地址:遂昌县妙高街道二都街
电话:0578-8528483
2016年第七期
粮油第七期
2016年8月5日 

抓住关键时期,做好水稻病虫害的防治

受第 4 号台风外围影响,自8月2日起多阵雨天气,有利水稻病虫的发生。我县单季晚稻将于8月中下旬陆续抽穗,这是防治病虫的关键时期,病虫主要有稻飞虱、纵卷叶螟、纹枯病、稻曲病、稻瘟病等二虫三病。
一、发生情况:
1、稻飞虱。2016年8月4日观测圃田间查褐稻虱87.5头/百丛,短翅成虫1.3头/百丛;白背稻虱501.3头/百丛,成虫40头/百丛。观测圃外褐稻虱43.8头/百丛,短翅成虫0.6头/百丛;白背稻虱205头/百丛,成虫12.5头/百丛。由于近期天气凉爽,适合褐飞虱繁殖。
2、纵卷叶螟。田间亩蛾量一直不高,8月4日亩蛾量18.3头,田块间差异大,后期蛾量会逐渐上升,近期多阵雨,有利于本代卷叶螟产卵、孵化。
3、纹枯病: 8月4日查单季晚稻田间纹枯病病丛率16.5%,病株率5.7%,田间郁闭度增大,纹枯病发病率趋势逐渐上升。
4、稻瘟病:单季晚稻田间已发现叶瘟发生,总体较轻。但8
月2日以来,阵雨天气较多,而山区特殊的气候条件,即使晴天,也雾多露大,适温高湿,易引起穗颈瘟发生流行。预计在山区、半山区稻区的感病品种上发生程度偏重,局部地区发生流行可能性大。
5、稻曲病:自8月2日起多阵雨,强对流天气频繁,若适温高湿天气与水稻感病生育期吻合,有利稻曲病发生流行。
6、二化螟:。灯下蛾量不多,没有明显的蛾峰
二、防治措施:
1、防治对策:主要以稻曲病防治时间为准,杂交品种在10-20%主穗剑叶完全抽出时进行防治,在破口期至始穗期再进行第二次防治(结合防治穗颈瘟),穗颈瘟对感病品种和已发病的田块在齐穗期再用药一次,做到早破口,早用药,迟抽穗,迟用药。兼顾防治褐飞虱、纵卷叶螟(重点保护水稻功能叶)、纹枯病。按照达标防治的要求,确定防治对象田,加强药后防治效果的检查,及时补治。(防治指标:稻飞虱孕穗期平均5-6只/丛,齐穗灌浆期8-10只/丛,蜡熟期10-15只/丛;纵卷叶螟百丛有效虫量穗期20条;二化螟穗期丛螟害率大于1%。)
2、防治药剂:防治稻飞虱可选用50%吡蚜酮15克/亩或60%烯啶〃吡蚜酮10克/亩兑水喷雾;防治纹枯病可用24%噻呋酰胺20毫升/亩或75%戊唑〃嘧菌酯10克/亩或32.5%苯甲〃嘧菌酯40毫升/亩或或75%肟菌〃戊唑醇15克/亩(可兼治稻曲病、稻瘟病)兑水喷雾。防治纵卷叶螟、二化螟,可选用10%四氯虫酰胺30毫升/亩或6%阿维.氯苯酰40毫升/亩或15%茚虫威12毫升/亩兑水
喷雾;防稻曲病可用30%苯醚甲环唑〃丙环唑20毫升/亩或75%肟菌〃戊唑醇15克/亩。预防稻瘟病用20%三环唑100克/亩或30%稻瘟灵120毫升/亩或75%肟菌〃戊唑醇15克/亩。
三、安全用药:在施药时要用足水量,亩用药液量不能少于50升,用药时田间须保持水层,药后保水3-5天,药剂注意轮换使用,严禁使用国家明令禁止的高毒高残留农药和菊酯类农药防治水稻病虫。对褐飞虱为主稻田停止推荐吡虫啉及低浓度噻嗪酮及其复配制剂。破口抽穗期使用三唑类杀菌剂防治纹枯病和稻曲病,要掌握用量,不能盲目混用和加大剂量,以免产生药害。水稻齐穗以后尽量不用或少用化学农药,对于确实要用的,必须严格掌握农药安全间隔期,以确保稻米质量安全。天气进入高温季节,提倡早晚施药,避开高温时段,防止中毒事故发生。注意药剂轮换使用,延缓产生抗药性,回收农药废弃包装物。
调查:陈月仙
预报:陈月仙
签发:朱金星

 
 
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