68.75%噁酮·锰锌水分散粒剂对柑桔黑点病的防治效果

Effect of 68.75%mancozeb·famoxadone WG on control of citrus melanose

柑桔黑点病(由Diaporthe citri引起)是危害柑桔果实商品性最严重的病害之一,每年需要喷施4~5次杀菌剂进行防治。为明确68.75%噁酮·锰锌水分散粒剂(6.25%噁唑菌酮和62.5%代森锰锌的混剂)对柑桔果实黑点病的防治效果,分别在浙江黄岩和常山进行了田间试验。结果发现,黄岩试验点68.75%噁酮·锰锌水分散粒剂500倍液全程5次用药对黑点病的防治效果为84.79%,常山试验点800倍液全程4次用药对黑点病的防治效果为74.10%,效果不亚于常规推荐的杀菌剂代森锰锌。认为,生产中采用68.75%噁酮·锰锌水分散粒剂500~800倍液在柑桔谢花2/3进行第1次树冠喷雾,此后隔20~25 d喷1次,共喷4~5次,可有效防治柑桔黑点病。

Citrus melanose caused by Diaporthe citri is one of the most serious diseases affecting citrus marketability and requires spraying of fungicides 4-5 times a year for control.Field tests were conducted in Huangyan and Changshan,Zhejiang Province,to determine the effect of 68.75%mancozeb·famoxadone WG(a mixture of 6.25%famoxadone and 62.5%mancozeb)on control of citrus melanose.The results showed that the control effect by spraying 68.75%mancozeb·famoxadone WG during fruit growing season was 84.79%in test site of Huangyan by 5 sprays with 500 times dilution,and 74.10%in test site of Changshan by 4 sprays with 800 times dilution,which the control effect was similar to that of the conventional recommended fungicide mancozeb.It is suggested that first spray of 500-800 times dilution of 68.75%mancozeb·famoxadone WG after 2/3 of the citrus flower faded,and then spray once every 20-25 days for a total of 4-5 times could effectively control citrus melanose.