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洪澇災后農作物病蟲害防治技術指導意見來了!
2023-08-04
09:07:46
來源:全國農技推廣中心 閱讀量:15839
評論
【農機網 熱點關注】近期以來,受臺風“杜蘇芮”等的影響,東南沿海等地遭受暴雨、大暴雨侵襲,江淮、黃淮東部和京津冀等地出現強降雨天氣,部分地區田間積水較多、澇漬嚴重,導致水稻、玉米、花生、大豆、蔬菜等農作物長勢弱、傷口多、抗性差,非常有利于各種病蟲害的發生。為做好臺風洪澇災后農作物病蟲害防控工作,減輕災害損失,全國農技推廣中心制定了《臺風洪澇災害后主要農作物病蟲害防治技術指導意見》。
防治要點
水稻病蟲害。暴雨和臺風影響后,田間水層高、濕度大,植株傷口多,極有利于病害侵染流行。災后要搶晴抓早,立即噴施噻唑鋅或噻霉酮等藥劑,預防細菌性條斑病、白葉枯病、細菌性基腐病等細菌性病害發生。當田間出現葉瘟急性病斑或發病中心以及紋枯病病株時,可選用三環唑、春雷霉素、枯草芽孢桿菌、申嗪霉素、多抗霉素,以及井岡霉素A、井岡•蠟芽菌、咪銅•氟環唑、多抗霉素等藥劑進行防治。
受臺風影響,稻飛虱、稻縱卷葉螟可隨降雨大量遷入,導致田間蟲量突增。稻飛虱在稻株下部刺吸植株,為害隱蔽,防治不及時易引起“冒穿”倒伏嚴重減產。當稻飛虱田間蟲量達到1000頭/百叢的防治指標時,要搶晴噴施
殺蟲劑防治,藥劑可選用金龜子綠僵菌CQMa421、球孢白僵菌、醚菊酯、吡蚜酮、烯啶蟲胺、呋蟲胺、三氟苯嘧啶等品種。要密切關注稻縱卷葉螟田間蛾量和幼蟲量,處于分蘗期的稻田可適當放寬防治指標,利用植株補償能力和自然天敵控害作用;單季稻孕穗至抽穗期,當卷葉或束葉尖達到60個/百叢的防治指標時,可選用甘藍夜蛾核型多角體病毒、金龜子綠僵菌CQMa421等微生物制劑或氯蟲苯甲酰胺、茚蟲威、四氯蟲酰胺等化學藥劑進行防治。
玉米病蟲害。大雨、泥沙、漬澇等易造成玉米植株受傷,抗性變弱。要在排澇除濕、中耕松土,噴施氨基寡糖素、蕓薹素內酯等免疫誘抗或生長調節劑,增強作物抗性的基礎上,針對玉米基腐病、葉斑病、枯萎病等細菌性病害可能重發的情況,及時噴施嘧啶核苷類抗菌素、井岡霉素等藥劑進行防治。
針對瘤黑粉病、褐斑病、小斑病、紋枯病、南方銹病等真菌病害,可選用多菌靈、吡唑醚菌酯、戊唑醇等藥劑進行防治。對于草地貪夜蛾、棉鈴蟲等遷飛性害蟲,可選用氯蟲苯甲酰胺、甲維鹽等推薦用藥進行防治。
花生病蟲害。雨后驟晴,田間高溫高濕易導致花生葉斑病、果腐病、白絹病,以及棉鈴蟲、斜紋夜蛾、甜菜夜蛾等食葉害蟲的發生,要立即組織開展防治。對于花生葉部病害可選用聯苯三唑醇、氟環唑、烯唑醇、三唑酮等殺菌劑進行葉面噴霧防治;花生果腐病可選用多菌靈、嘧菌酯、三唑酮、多抗霉素等噴霧防治;白絹病可選用氟酰胺、噻呋酰胺等殺菌劑兌水噴淋植株莖基部;棉鈴蟲、斜紋夜蛾等食葉害蟲,可用氯蟲苯甲酰胺、甲維鹽等葉面噴霧。病蟲害發生嚴重時,在第一次施藥7—10天后再噴施1次。
大豆病蟲害。洪水過后,田間濕度大,易滋生病蟲害。黃淮地區要重點防治大豆根腐病、銹病、霜霉病、灰斑病和蚜蟲、豆莢螟、食心蟲等病蟲害。可選用精甲霜靈•咯菌腈、吡唑•氟環唑、苯甲•丙環唑、嘧菌酯、多菌靈等殺菌劑,吡蟲啉等殺蟲劑,進行噴霧防治。此外,災后大豆長勢弱、持續高溫等易引起大豆癥青,可葉面噴施硼肥和氨基酸、氨基寡糖、香菇多糖等營養物質或免疫誘抗劑,增強植物自身抗逆能力。同時,選用噻蟲胺、呋蟲胺等防治點蜂緣蝽、飛虱、薊馬等介質害蟲。
蔬菜病害。水災導致蔬菜植株受損、抵抗力弱,加之田間高溫高濕,極有利于瓜類、茄果類、十字花科、豆科蔬菜等多種病害發生。要在及時疏通排水、中耕松土的基礎上,對長勢差、植株抵抗力弱的田塊,及時噴施氨基寡糖素、赤•吲乙•蕓苔等免疫誘抗劑增強植株抗病性。要堅持預防為主的原則,雨后及時噴施代森錳鋅、百菌清、代森鋅等保護性殺菌劑預防病害的發生。
針對漬水后疫病、莖基腐病、青枯病、根腐病等土傳病害高發態勢,及時采用枯草芽孢桿菌、多粘類芽孢桿菌、蠟質芽孢桿菌、木霉菌、噁霉靈、多菌靈、福美雙等藥劑進行灌根或潑澆處理。針對葉果等部位病害,在霜霉病、疫病、炭疽病等真菌性病害發生初期,噴施寡雄腐霉、多抗霉素、烯酰嗎啉、氟吡菌胺•烯酰嗎啉、霜霉威、吡唑醚菌酯、苯醚甲環唑、醚菌酯、嘧菌酯等藥劑進行防治;針對軟腐病、細菌性角斑病等細菌性病害可噴施中生菌素、噻霉酮、噻唑鋅、氫氧化銅、琥膠肥酸銅、喹啉酮等藥劑防治。用藥時要注意交替用藥和用藥安全間隔期。
注意事項
注意科學用藥。臺風和洪澇后應急施藥預防病蟲害,農藥品種宜選用高含量單劑,避免使用低含量復配劑,確保防治效果。多種殺菌劑、殺蟲劑混用時,應注意不同品種藥劑的混用要求,避免相互作用影響藥效。
選擇合適藥械。災后田間積水較多、土壤濕度較大地塊不適宜人工和大型機械下田作業,可選用植保無人機等航空植保器械噴灑作業,畝噴液量不低于1.5升,并在藥液中添加植物油類、有機硅類和聚合物類的沉降劑、抗蒸發劑等適宜飛防的助劑。較干燥的田塊大面積作業可選用地面自走式噴桿
噴霧機,畝噴液量一般控制在10~15升,小面積作業可采用人工背負式
噴霧器,畝噴液量一般控制在15升左右。
預防中毒事故。雨后高溫高濕天氣田間施藥容易發生中暑和中毒事故,施藥作業時間盡量避開中午高溫時段,選擇在上午9點前或下午16點后進行,遇風力大于3級以上或下雨天氣,應停止施藥。施藥時要注意做好安全防護,穿戴好防護服、口罩、手套等防護用品。施藥過程中不吃東西、不吸煙,避免發生中毒事故。施藥后要及時洗手、洗澡、換衣,并將噴霧器械清洗干凈。
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