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． In order to test the effect of plant-borne anti-pathogenic agents, Huang-Ning EC, on cotton seedling diseases, pot experiments were carried out. The soaking of 7% citronellal 500 times liquid showed significant effects on red rot, blight and black spot of cotton seedlings with control effect of 8263%, 7472% and 5494%, respectively. Anti-seeding effect of 68%, 1000 times and 25% carbendazim 500 times less effective. Seed soaking with 500 times of 7% yellow lemon EC was able to inhibit the germination rate of the tested cotton varieties (the inhibition rate was 28%).