黄柠乳油防治棉花苗期病害试验

Experiments of Prevention and Cure of Cotton Seedling Diseases by Huangling EC7

为检验植物性防病剂黄柠乳油防治棉花苗期病害的效果，进行了盆栽试验．７％ 黄柠乳油５００ 倍液浸种处理 ２０ ｍ ｉｎ 对棉苗红腐病、立枯病和黑斑病有显著效果，防效分别为 ８２６３％ ，７４７２％ ，５４９４％ ，防死苗的效果为 ６８％ ，１ ０００ 倍液与２５％ 多菌灵５００ 倍液的效果较差．７％ 黄柠乳油５００ 倍液浸种对供试棉花品种出苗率有抑制作用（抑制率达 ２８％ ），１ ０００ 倍液无药害．

Huangling EC7,a plant extract,in higher concentration (500 time dilution) showed strong and significant (5% level) inhibitive effects on seedling diseases caused by Fusarium spp.,Rhizoctonia solani and Alternaria tenus (82 63%,74 72% and 54.94% respectively). While lower concentration (1 000 time dilution) of Huangling EC7 and 25% cambendazim WC (500 time dilution) did not give control. In higher concentration (500 time dilution),Huangling EC7 exhibited inhibitive effects on seed germination,but did not have risk of damage in lower concentration (1 000 time dilution).