从江柑橘黑点病发生调查及其防治药剂筛选

Occurrence Investigation and Control Agent Screening for Congjiang Citrus Black Spot Disease

【目的】探明从江柑橘黑点病发生情况及规律,并筛选出有效防治药剂,为从江柑橘黑点病的防控提供参考。【方法】采用病情普查及系统调查方法,开展从江柑橘黑点病发生情况与发病规律调查;通过在田间设置不同药剂及施药方式处理,开展黑点病防控药剂筛选。【结果】调查果园的柑橘黑点病发病率为100%,病情指数大于50的果园占40%,老果园发病重,不同品种均可感病,夏季雨季及9月上旬是防治关键时期。以80%代森锰锌700倍液、70%丙森锌可湿性粉剂1000倍液、50%氟啶胺悬浮液1000倍液3种药剂按次序轮换使用2次以及50%氟啶胺悬浮液1000倍液+绿颖矿物油200倍液2种处理方式对柑橘黑点病的田间防效最佳,防效达100%;其次为50%氟啶胺悬浮液1000倍液,防效达92.31%。【结论】从江柑橘黑点病发病率高,其中以老果园发病较重,防治关键时期为夏季雨季及9月上旬。从江柑橘黑点病防治推荐80%代森锰锌可湿性粉剂700倍液、70%丙森锌可湿性粉剂1000倍液、50%氟啶胺悬浮液1000倍液3种药剂按次序轮换使用2次,或用50%氟啶胺悬浮液1000倍液配合绿颖矿物油200倍液施用,可取得明显的防治效果。

【Objective】The occurrence status and rules of Congjang citrus black spot disease were explored,and the effective control agents were screened,which provided a reference for the prevention and control of Congjiang citrus black spot disease.【Method】The occurrence situation and disease rule of Congjiang citrus black spot disease were investigated by disease census and systematic investigation methods.The control agents against black spot disease were screened through setting different agents and application methods in field.【Result】The incidence of citrus black spot disease in investigated orchards was 100%.The orchards with disease index above 50 accounted for 40%.Old orchards were heavily affected,different varieties could be susceptible to the disease,and summer rainy season and early September were the key periods for the control.The field control efficiency of two treatments,respectively three agents of 80%Mancozeb diluting 700 times,70%propineb WP diluting 1000 times and 50%fluazinam SC diluting 1000 times using twice in turn,or 50%fluazinam SC diluting 1000 times+Lvying mineral oil diluting 200 times,against citrus black spot was the best,which was up to 100%,followed by 50%fluazinam SC diluting 1000 times,the control efficiency reached 92.31%.【Conclusion】The incidence of Congjiang citrus black spot disease is high,among which old orchards are heavily affected,and the key periods for the control are in summer rainy season and early September.It is suggested applying 80%Mancozeb diluting 700 times,70%propineb WP diluting 1000 times and 50%fluazinam SC diluting 1000 times twice in turn,or 50%fluazinam SC diluting 1000 times+Lvying mineral oil diluting 200 times to prevent and control Congjiang citrus black spot disease can achieve the obvious control effects.