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首页> 外文期刊>Phytopathologia Mediterranea >Effect of pea cultivar, pathogen isolate, inoculum concentration and leaf wetness duration on Ascochyta blight caused by Mycosphaerella pinodes
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Effect of pea cultivar, pathogen isolate, inoculum concentration and leaf wetness duration on Ascochyta blight caused by Mycosphaerella pinodes

机译：豌豆品种，病原菌分离物，接种物浓度和叶片湿润时间对松球菌引起的枯萎病的影响

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摘要

The effect of host leaf wetness duration, Mycosphaerella pinodes inoculum concentration and pathogen isolate on the latent period and the incubation period of the pathogen or disease severity were quantified on pea (Pisum sativum L.). Seedlings of two widely grown pea cultivars, Onward and Merveille de Kelvedon, respectively susceptible and moderately resistant to M. pinodes were subjected to six leaf wetness durations of 6, 12, 24, 48 and 72 h, and inoculated with five inoculum concentrations, 2.5x10(3), 4x10(4), 3.5x10(5), 4x10(6), and 5.2x10(7), in order to determine whether the cultivars reacted differently to M. pinodes isolates inoculated under identical conditions. Increasing the duration of leaf wetness and inoculum concentration caused significant (P<0.001) increases in disease severity within each cultivar. Both the incubation period and the latent period decreased with increasing conidial concentration and leaf wetness duration. Generally, the cv. Onward had a significantly shorter incubation period, and latent period and higher disease severity than cv. Merveille de Kelvedon. Isolates differed in aggressiveness at higher levels of leaf wetness (48 h) duration and of inoculum concentration (4x10(6)), but there was no significant interaction between isolates and leaf wetness duration, or between isolates and inoculum concentration. The optimum levels for obtaining a consistent infection and for readily separating the susceptible and the partially resistant cultivars were a leafwetness of 48 h and an inoculum concentration of 4x10(6). The study also showed that continuous leafwetness for 48 h was a threshold for application of fungicides to control the fungus in the susceptible cultivar.
机译：在豌豆（Pisum sativum L.）上定量了寄主叶片的湿润时间，松散的球菌接种浓度和病原菌分离物对病原体潜伏期和潜伏期或病害严重程度的影响。对两个对豌豆念珠菌分别敏感和中等抗性的豌豆广泛种植的幼苗分别进行了6、12、24、48和72小时的六个叶浸湿时间的接种，并接种了5种浓度为2.5的接种物。 x10（3），4x10（4），3.5x10（5），4x10（6）和5.2x10（7），以确定在相同条件下接种的品氏梭菌分离株是否有不同反应。叶片湿润时间和接种物浓度的增加会导致每个品种的病害严重程度显着增加（P <0.001）。随着分生孢子浓度和叶片湿润持续时间的增加，潜伏期和潜伏期均减少。一般来说，简历。从此以后，潜伏期显着缩短，潜伏期和疾病严重程度均高于简历。 Merveille de Kelvedon。在较高水平的叶片湿度（48 h）持续时间和接种浓度（4x10（6））下，分离株的侵略性不同，但是分离株与叶片湿度持续时间之间，分离株与接种物浓度之间没有显着的相互作用。获得一致感染并易于分离易感和部分抗性品种的最佳水平是叶片湿润度为48小时，接种浓度为4x10（6）。研究还表明，连续湿润48小时是应用杀菌剂控制易感品种中真菌的阈值。

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