12种农药对油茶炭疽菌的室内毒力测定

目的]通过室内试验筛选出可有效防治油茶炭疽病的药剂。方法]采用菌丝生长速率法测定了12种杀菌剂对油茶炭疽病的抑菌作用,并得到了12个毒力回归方程及抑制有效中浓度(EC50)。结果]12种杀菌剂对油茶炭疽病病原菌的毒力最强的为10%苯醚甲环唑WG,EC50值为47.8630 mg/L;21%硅唑多菌灵SC、25%咪酰胺EC次之,EC50值分别为97.7232、125.8925 mg/L;100%硫酸铜结晶和70%代森锰锌WP的毒力最差。结论]10%苯醚甲环唑WG、21%硅唑多菌灵SC以及25%咪酰胺EC均可有效抑制油茶炭疽病菌的生长,可进一步用于田间试验。

Toxicity Measurement of 12 Fungicides on Colletotrichun gloeosporioides from Camellia oleifera

Aims] In order to select fungicides that can effectively control Camellia oleifera anthracnose,indoor experiments were carried out.Methods] Toxicity of twelve fungicides on Colletotrichun gloeosporioides were measured using mycelium growth rate method and their toxicity regression equations and EC50s were got.Results] The toxicity of difenoconazole 10% WG was the strongest,with the EC50 of 47.8630 mg/L,followed by silicon carbendazim 21% SC and prochloraz 25% EC with the EC50 of 97.7232 and 125.8925 mg/L,respectively.The sensitivity of C.gloeosporioides to 100% copper sulfate and mancozeb 70% WP were lower than others.Conclusions] Difenoconazole 10% WG,silicon carbendazim 21% SC and prochloraz 25% EC can effectively inhibit the growth of C.oleifera anthracnose and could be used in filed trials.