Bioassay research of 17 Fungicides against Colletotrichum gloeosporioides Penz.

The bioassay of 17 fungicides against Colletotrichum gloeosporioides Penz.,which resulted in Citrus reticulate Blanco var.gonggan anthracnose in Deqing,was carried out by means of mycelium growth rate method.In this paper,12 new fungicides and 5 normal fungicides were included.Beside 250 g/L Amistar SC(EC50=14.9902 μg/mL)and 50% Stroby WG (EC50=114.7402 μg/mL) had low virulence,another 10 new fungicides,250 g/LSportak EC,50% Sporgon WP,25% Sico EC,250 g/L Cabrio EC,250 g/L Bumper EC,300 g/L Armure EC,10% Score WG,62% Shuangtanqing(B)WP,75 g/L Opal EC and 250 g/L Folicur EW,which EC50 all were between 0.0128 and 0.3637 μg/mL,showed better virulence than all 5 normal fungicides according to EC50,8.3998 μg/mL of 50% Carbendazim WP,13.2340 μg/mL of 40% Dacotech SC,122.5649 μg/mL of 62% Shuangbo WP,400.9587 μg/mL of 80% Mancozeb WP and 131904.3068 μg/mL of 70% TOPSIN-M WP.The control effect of the 17 fungicides will be tested in field experiment.Whether the pathogen has become resistent to Carbendazim,Chlorothalonil,Mancozeb and Thiophanate-methyl and the degree of resistance was needed more research including the experiment in field.