川黄柏浸提液对白及锈病防治效果及其机制的研究

Study on the control effect and mechanism of Phellodendron chinense extract on Bletilla striata rust diseases

以川黄柏皮、叶浸提液作为白及锈病的防治剂,统计防治剂处理下白及锈病的发病率、病情指数、防效及病级分布,讨论川黄柏浸提液对白及锈病的防治效果,阐明川黄柏浸提液对白及锈病的防治机制。结果表明,ZP50处理下白及锈病发病率最低、病情指数最小,6月份病情指数表现为Y50>CK>Y25>P25>ZP25>P50>ZP50;与CK对比,ZP50处理防治效果最好,其中7月份防效为93.64%;从6月份和7月份病级分布来看,ZP50处理下白及锈病病危程度弱。ZP50处理通过降低白及锈病的发病率,调控1级、7级和9级病情占比,以控制白及锈病病危程度,降低病情指数来实现白及锈病的防治效果。总体上,川黄柏皮浸提液比川黄柏叶浸提液防治效果好,煮制川黄柏皮浸提液比不煮制川黄柏皮浸提液防治效果好,高浓度川黄柏皮浸提液比低浓度川黄柏皮浸提液防治效果好,川黄柏浸提液可作为白及锈病的绿色防治剂。

The Phellodendron chinense bark and leaf extracts were used as the control agent for Bletilla striata rust disease.The incidence rate,disease index,control effect and disease grade distribution of Bletilla striata rust disease under the treatment of the control agent were counted,and the control effect of Phellodendron chinense extract on Bletilla striata rust disease was discussed,and the prevention and control mechanism of Phellodendron chinense extract on Bletilla striata rust disease was clarified.The results showed that the incidence rate and disease index of Bletilla striata rust disease were the lowest under ZP50 treatment.In June,the disease index was Y50>CK>Y25>P25>ZP25>P50>ZP50.Compared with CK,ZP50 treatment had the best control effect,and the control effect was 93.64%in July.From the distribution of disease levels in June and July,the disease severity of Bletilla striata was weak under ZP50 treatment.The ZP50 treatment could control the critical degree of Bletilla striata rust and reduce the disease index by reducing the incidence of Bletilla striata rust and regulating the proportion of disease conditions of grade 1,7 and 9.Overall,the control effect of Phellodendron chinense bark extract was better than that of Phellodendron chinense leaf extract,and the control effect of boiled Phellodendron chinense bark extract was better than that of uncooked Phellodendron chinense bark extract,and high concentration Phellodendron chinense bark extract had better control effect than low concentration Phellodendron chinense bark extract.Phellodendron chinense extract can be used as a green control agent for Bletilla striata rust disease.