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病虫情报
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关键时期抓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:

遂昌病虫情报

第七期

浙江省遂昌县植物保护检疫站                          0一五年八月四日

地址:遂昌县妙高镇二都街种子公司内                         邮政编码:323300

E-mail:scnyjzbz@mail.lsptt.zj.cn; lssccbz@zjagri.gov.cn               电话:(05788185115  

  关键时期抓好水稻病虫害的防治

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,病虫主要有稻虱、纵卷叶螟、纹枯病、稻曲病、稻瘟病等二虫三病,预测稻飞虱、纹枯病中等偏重发生、纵卷叶螟中等发生稻瘟病在山区、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。

一、发生趋势:

1、稻虱。201583日观测圃田间查褐稻虱76.3/百丛,短翅成虫10/百丛,白背稻虱205/百丛,成虫95/百丛,观测圃外褐稻虱79.4/百丛,短翅成虫7.5/百丛,白背稻虱206.3/百丛。预测五代稻虱中等偏重发生。

2、纵卷叶螟。田间亩蛾量一直不高,82日亩蛾量33.8头,后期蛾量会逐渐上升,预测五(3)代纵卷叶螟中等发生。

3、纹枯病: 83日查单季晚稻田间纹枯病丛率24.5%,株率5.6 %纹枯病发病率趋势逐渐上升,田间郁闭度增大,预测纹枯病中等偏重发生。

4、二化螟:灯下蛾量不多,没有明显的蛾峰。

5、稻瘟病:单季晚稻田间已发现叶瘟发生。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。

6、稻曲病水稻破口期前如遇连续阴雨天气,将偏重发生。

二、防治措施:

1防治对策:812-15日,主治稻飞虱、纹枯病,挑治纵卷叶螟(重点保护水稻功能叶)、二化螟,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/丛,齐穗灌浆期8-10/丛,蜡熟期10-15/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%。)稻曲病在水稻破口前5-7喷药预防,如遇多雨天气,破口期再施药一次;稻瘟病在水稻破口期普遍喷药预防,对感病品种和已发病的田块在齐穗期再用药一次

2、防治药剂:防治稻飞虱可选用50%吡蚜酮15/60%烯啶·吡蚜酮10/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/亩或32.5%苯甲·嘧菌酯40毫升/亩或75%肟菌·戊唑醇15/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12%甲维·氟酰胺10毫升/亩或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/亩或10%阿维·氟酰胺30毫升/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/。预防稻瘟病用20%三环唑100/亩或30%稻瘟灵120毫升/亩或75%肟菌·戊唑醇15/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35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

 
 
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