Control effect and economic benefits analysis of three fungicide combinations on potato late blight
Potato late blight is an important disease in potato production,and chemical control is still an important method to prevent and control the disease.In this study,three protocols for late blight prevention and control with fungicide were designed.The fungicide of protocol 1 is eugenol 0.3％SL+dimethomorph 10％EW 160 g/(667m2·time);protocol 2 is eugenol 0.3％SL+dimethomorph 10％EW 120 g/(667m2·time)+mancozeb 80％WP 60 g/(667m2·time)+synergistic ketone pear 15 g/(667m2·time);protocol 3 is mancozeb 80％WP 60 g/(667m2·time)+synergistic ketone pear 15 g/(667m2·time)+fluopicolide·propamocarb hydrochloride 68.75％SC 60 mL/(667m2·time)or oxathiapiprolin 10％OD 15 mL/(667m2·time)or fluazinam 50％SC 30 mL/(667m2·time)in which fluopicolide·propamocarb hydrochloride 68.75％SC,oxathiapiprolin 10％OD and fluazinam 50％SC are used alternately.According to the incidence progress of potato late blight in the field and combined with the information of warning system,field application of the fungicide was carried out to compare and evaluate the control effect and control cost.The results showed that in the whole control period,the field control effect of the three fungicide protocols on potato late blight was more than 90％,and all had good control effect.The yield of the three protocols was significantly higher than that of CK with water and there was no significant differences in control effect and yield among the three protocols.Protocol 1 has the lowest input cost and protocol 2 has the lowest input-output ratio,among which protocol 1 contains 0.3％eugenol,a plant—derived biopesticide,which not only saves cost,but also reduces the use of chemical pesticides.In production,several protocols can be used alternately to avoid developing resistance.
potatopotato late blightfungicide protocolscontrol effecteconomic benefits
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