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对葱紫斑病菌孢子萌发侵染、潜育显症、杀菌剂筛选等进行了研究。结果表明:葱紫斑病病原菌分生孢子在适温下的清水中3 h的萌发率可达到87%,附着胞开始形成,6 h后附着胞的形成达到高峰。分生孢子的侵入率和附着胞的形成率呈高度正相关;23~30℃适宜孢子萌发,25℃为孢子萌发的最适温度;萌发后干燥6 d后孢子死亡。氮、磷、钾肥均可显著降低葱紫斑病的侵染,且氮、钾肥对大葱抗侵染的效果好于磷肥。葱紫斑病的潜育期为3 d,其累积显症率与时间的关系曲线为“倒J”型;百菌清对葱紫斑病菌孢子萌发的抑制效果最好,新万生、大生和杀毒矾的效果次之,而多菌灵、甲基托布津、三唑酮效果较差。
Spore germination and infection of Alternanthera philoxeroides, latent disease, fungicide screening were studied. The results showed that the germination rate of conidia of pathogen conidia of Zizyphus sawheadici reached 87% in 3 h under the proper temperature, and the attachment cells started to form, and reached the peak after 6 h. The conidial invasion rate was highly positive correlated with the rate of adherent cells formation. The suitable temperature for spore germination was 23-30 ℃, and the optimum temperature for spore germination was 25 ℃. The spores died after 6 d of germination. Nitrogen, phosphorus and potassium fertilizers can significantly reduce the infection of purple spot disease, and the effect of nitrogen and potassium fertilizers on the resistance of green onions is better than that of phosphate fertilizer. The incubation period of onion purpura was 3 days, the cumulative curve of which was “inverted J”, and the effect of chlorothalonil on the spore germination was the best, and that of Xinshengsheng, Daisheng and antivirus Alum followed, and carbendazim, thiophanate methyl, triadimefon poor effect.