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对玉米灰斑病的重要流行环节——孢子萌发、病斑潜育扩展和寄主抗侵染进行了研究。结果表明:分生孢子在清水中就能够萌发,但未见附着胞形成;花粉和叶面物质对孢子萌发有促进作用。孢子抗干燥能力较强,萌发孢子须经3~4 d干燥才完全丧失存活能力。对灰斑病菌孢子萌发抑制作用较强的杀菌剂有百菌清、甲基托布津、大生、多菌灵等。病害潜育期较长,潜育期随玉米生育期推进而增长,在不同品种上潜育期为11~18 d。病斑长度(y)和病斑日龄(x)的关系大体为对数曲线,回归方程为y=0.263 5+5.163 ln(x+1)。随着玉米生育期的推进,抗侵染力逐渐增强。施用氮、磷、钾肥可在一定程度上增强玉米的抗侵染力。
The important epidemic of corn gray spot disease - spore germination, lesion spread and host resistance to infection were studied. The results showed that the conidia could germinate in the water, but no attachment cells formed. The pollen and foliar substances promoted the spore germination. Spore anti-drying ability is strong, spore germination must be dried after 3 ~ 4 d completely lost viability. Chlorpyrifos spore germination strong bactericide fungicide clear, thiophanate methyl, Health, carbendazim and so on. The latent period of disease is longer, and the latent period increases with the growth of maize. The incubation period of different varieties is 11-18 days. The relationship between lesion length (y) and lesion age (x) is logarithmic curve, the regression equation is y = 0.263 5 + 5.163 ln (x + 1). With the promotion of corn growth period, anti-infestation gradually increased. The application of N, P and K fertilizers can enhance the anti-infestation ability of maize to a certain extent.