4.5%丙·壳寡糖可溶性液剂对番茄灰霉病的控制效果

为明确4.5%丙·壳寡糖可溶性液剂对番茄灰霉病的控制效果，采用菌丝生长速率法和悬滴法测定4.5%丙·壳寡糖可溶性液剂对番茄灰霉病菌的室内毒力，并采用常规喷雾法测定该药剂对番茄灰霉病的果实组织、盆栽的影响及田间药效。室内生物测定结果表明，该药剂对番茄灰霉病菌（Botrytis cirerea）菌丝生长和孢子萌发的有效抑制中质量浓度（EC₅₀）分别为1.56 mg/L和2.60 mg/L，共毒系数（CTC）分别为566.9和 641.58 ，表现为显著增效作用。组织法试验和盆栽试验结果表明，在225 mg/L剂量下，该药剂对番茄灰霉病有较好的保护作用和治疗作用，组织法对病害防效为78.06%和61.21%，盆栽试验对病害防效为51.36%和58.49%，在同样剂量下，该试剂对番茄灰霉病田间药效试验防效分别为58.47%（叶片）和64.21%（果实）。因此，4.5%丙·壳寡糖可溶性液剂对番茄灰霉病具有较好的防治效果，在农业生产上值得开发 利用。

Control Effect of 4.5% Propamidine-chitosan Soluble Liquid Agent to Botrytis cirerea

In vitro toxicity of 4.5% propamidine-chitosan soluble liquid agent (SL) to Botrytis cirerea was determined by the method of mycelium growth and spore bourgeon, and spray method was used to the tissue test, pot test and field efficacy trials. The indoor biological determination results showed that EC₅₀ of the agent was 1.56 mg/L against mycelium growth of Botrytis cirerea and 2.60 mg/L against spore bourgeon of Botrytis cirerea, co-toxicity coefficient (CTC) were 566.9 and 641.58, respectively , showing significant synergisms. The agent showed good protective and therapeutic effects in tissue test and pot test at the concentration of 225 mg/L. The protective and therapeutic effects for Botrytis cirerea were respectively 78.06% and 61.21% in tissue test effects, and 51.36% and 58.49% respectively in pot test Field efficacy was 58.47% on leaf and 64.21% on fruit respectively at the same concentration of the SL agent. 4.5% propamidine-chitosan soluble liquid agent has a good control effect on Botrytis cirerea and can be used to control Botrytis cirerea in agricultural production.