橡胶胶孢炭疽菌和尖孢炭疽菌对杀菌剂的敏感性测定

 云南省橡胶炭疽病危害日趋严重，为了解病原菌耐药性差异，采用生长速率法室内测定了云南省橡胶炭疽病菌——胶孢炭疽菌（Colletotrichum gloeosporioides）和尖孢炭疽菌（Colletorichum acutatum）对咪鲜胺、多菌灵、甲基托布津、溴菌腈、百菌清和代森锰锌的敏感性。结果表明：胶孢炭疽菌对咪鲜胺、多菌灵和甲基托布津的敏感性高，EC50分别为0.020 9 μg/mL，0.050 5 μg/mL和0.404 3 μg/mL；尖孢炭疽菌同样对咪鲜胺、多菌灵和甲基托布津的敏感性高，EC50分别为0.0290 μg/mL，0.194 6 μg/mL and 3.8347 μg/mL，但要显著低于胶孢炭疽菌的敏感性；两种炭疽菌均对代森锰锌不敏感。

Sensitivity Test of Colletotrichum gloeosporioides and Colletotrichum acutatum Isolated from Rubber to the Fungicides

Colletotrichum leaf fall of rubber tree is becoming an increasingly important disease in Yunnan province. Sensitivity test was carried out in laboratory to screen the effective fungicides to Colletotrichum gloeosporioidesand Colletotrichum acutatum isolated from rubber in Yunnan. Prochloraz, carbendazim, thiophanate methyl, bromothalonil, dacotech and mancozeb were tested by using the mycelial linear growth rate method. The results showed that C. gloeosporioides isolates tested were extremely sensitive to prochloraz, carbendazim, thiophanate methyl with EC50 of 0.020 9 μg/mL, 0.050 5 μg/mL and 0.404 3 μg/mL, respectively. C. acutatum isolates were sensitive to prochloraz, carbendazim, thiophanate methyl with EC 50 of 0.029 0 μg/mL, 0.194 6 μg/mL and 3.834 7 μg/mL, respectively. But the sensitivtivity of C. acutatum was lower than that of the former, and mancozeb had a low inhibition to both fungi.