Effects of Different Fungicides and Application Periods on the Control Efficacy of Pepper Anthracnose
[Objective]The suitable control fungicides and application periods against pepper anthracnose in Guizhou were explored to provide a reference for the chemical control of pepper anthracnose.[Method]15 registered single fungicides(25%prochloraz EC,80%bordeaux mixture WP,50%trifloxystrobin WG,22.7%dithianon SC,70%mancozeb WP,40%chloroehalonil SC,30%copper succinate WP,80%captan WG,22.5%picoxystrobin SC,85%trichloroisocyanuric acid SPX,40%difenoconazole SC,500g/L fluazinam SC,50%prochloraz-manganese WP,250 g/L azoxystronbin SC and 25%pyraclostrobin SC)and 1 mixed fungicide(40%difenoconazole·pyraclostrobin SC)were selected as the agents.Three main pathogens(C.scovillei GL 17-25,C.gloeosporioides GL 17-42 and C.fructicola GL 17-147)of pepper anthracnose in Guizhou were screened as the control objects.The fungicides were preliminary screened by mycelial growth inhibition rate method and in vitro fruit-inoculation test,and the suitable fungicides and application periods were further verified by field experiment.[Result]The mycelial growth inhibition rates of 25%prochloraz EC,50%prochloraz-manganese WP and 70%mancozeb WP against three pepper anthracnose were 100.00%.In vitro fruit-inoculation test showed that the average preventive effect of all agents except 70%mancozeb WP was higher than that of treatment.The average preventive and therapeutic effects of 25%prochloraz EC against the three strains were 72.48%and 60.01%,respectively,followed by 25%pyraclostrobin SC(43.53%and 30.36%).Compared with the fungicides used in the middle stage of the disease,the disease index of the fungicides used in the early stage of the disease was low and the control efficacy was high.The control effect of 25%pyraclostrobin SC and 40%difenoconazole·pyraclostrobin SC was significantly higher than 25%prochloraz EC(P＜0.05).The control effects of the first two fungicides were 86.99%and 88.59%,respectively,and 50.87%and 45.48%respectively in the middle stage of the disease.[Conclusion]25%pyraclostrobin SC and 40%difenoconazole·pyraclostrobin SC can effectively control pepper anthracnose,and the control period is better in the early stage of the disease.
pepperanthracnosefungicideprevention and control periodmycelial growth inhibition ratecontrol efficacyGuizhou
NETL
NSTL
万方数据
