戊唑醇和咯菌腈复配对火龙果褐腐病菌的联合毒力及田间防效  

Synergistic Toxicity and Field Control Efficacy of Tebuconazole and Fludioxonil against Neoscytalidium dimidiatum on Pitaya

作　　者：蓝国兵[1,2] 何自福 于琳[1] 汤亚飞 李正刚[1] 邓铭光 佘小漫[1,2] LAN Guobing;HE Zifu;YU Lin;TANG Yafei;LI Zhenggang;DENG Mingguang;SHE Xiaoman(Plant Protection Research Institute,Guangdong Academy of Agricultural Sciences,Guangzhou 510640,China;Guangdong Key Laboratory of High Technology for Plant Protection,Guangzhou 510640,China)

机构地区：[1]广东省农业科学院植物保护研究所,广东广州510640 [2]广东省植物保护新技术重点实验室,广东广州510640

出　　处：《广东农业科学》2020年第5期74-79,共6页Guangdong Agricultural Sciences

基　　金：广州市科技计划项目(201607010061);国家科技支撑计划项目(2015BAD08B00);广东省科技创新战略专项资金(重点领域研发,2018B020205003);广东省农业科学院院长基金(201931);广东省自筹经费类科技计划项目(粤科规财字〔2015〕110号)。

摘　　要：【目的】明确戊唑醇和咯菌腈复配对火龙果褐腐病菌联合毒力与田间防治效果。【方法】采用生长速率法测定戊唑醇、咯菌腈及其复配药剂对火龙果褐腐病菌的室内毒力,以Wadley法评价增效作用,并验证了复配药剂对火龙果褐腐病的田间防效。【结果】咯菌腈和戊唑醇对火龙果褐腐病菌均表现出良好的抑菌效果,EC50值分别为0.0045、0.0671 mg/L。戊唑醇与咯菌腈不同配比对火龙果褐腐病菌表现为加和作用。有效浓度分别为100 mg/kg和500 mg/kg连续喷施3次时,末次药后7 d,戊唑醇和咯菌腈质量比8∶2复配对火龙果褐腐病平均防效分别为80.31%和89.44%,戊唑醇单剂平均防效分别为80.24%和89.71%,咯菌腈单剂平均防效分别为70.08%和76.29%;末次药后15 d,戊唑醇和咯菌腈质量比8∶2复配平均防效分别为76.80%和83.63%,戊唑醇单剂平均防效分别为74.63%和81.22%,咯菌腈单剂平均防效分别为54.53%和65.24%;复配药剂两种施药浓度的防效均比使用相同浓度单一药剂的防效高。【结论】戊唑醇和咯菌腈质量比为8∶2的复配药剂对火龙果褐腐病菌具有良好的抑菌效果,在田间防治效果好且对火龙果无药害,可以在火龙果生产上推广使用。【Objective】The study was to clarify the synergistic toxicity and field control efficacy of tebuconazole and fludioxonil against Neoscytalidium dimidiatum on pitaya.【Method】The mycelial growth rate method was used to determine the in vitro toxicity efficacy of tebuconazole,fludioxonil and their compound fungicide on N.dimidiatum.The synergistic effect of the compound fungicide was evaluated by Wadley method.The field experiment of the compound was carried out to verify its control effect on pitaya brown rot disease.【Result】Fludioxonil and tebuconazole showed good inhibitory effect against N.dimidiatum on pitaya,and the EC50 values were 0.0045 and 0.0671 mg/L,respectively.The compound of tebuconazole and fludioxonil exhibited an additive effect on N.dimidiatum.After 7 days of the last spraying with the active ingredient concentrations of 100 mg/kg and 500 mg/kg on pitaya plants for three times,the average control effects of tebuconazole and fludioxonil with the m ass ratio of 8∶2 were 80.31%and 89.44%,respectively.And the average control effect of single tebuconazole was 80.24%and 89.71%,while the average control effect of single fludioxonil was 70.08%and 76.29%,respectively.After 15 days of the last spraying,the average control effect of tebuconazole and fludioxonil with the mass ratio of 8∶2 was 76.80%and 83.63%,respectively.And the average control effect of single tebuconazole was 74.63%and 81.22%,while that of single flud ioxonil was 54.53%and 65.24%,respectively.The control effect of two active ingredient concentrations of tebuconazole and fludioxonil compound was higher than that of single fungicide.【Conclusion】The compound of tebuconazole and fludioxonil with the mass ratio of 8∶2 showed good inhibitory effect to N.dimidiatum on pitaya,and exhibited good control efficacy in the field,with non-toxicity to pitaya.Therefore,the compound fungicide with the mass ratio of 8∶2 could be promoted in pitaya production.

关 键 词：戊唑醇 咯菌腈 火龙果褐腐病菌 联合毒力 田间防效 

分 类 号：S482.2[农业科学—农药学]