【摘要】 1977年～1982年,用我国一套鉴别品种对本市郊区稻瘟病菌生理小种进行了研究。共采集全郊区61个籼粳稻品种的病标样186份,测试364个单孢菌株,鉴定出8群20个小种,其中ZF₁小种出现频率最高,分布于全郊区,为优势小种。在几年稻瘟病菌生理小种研究的基础上,选择代表性菌株31个,进行测定,筛选出郊区致病性基本稳定的菌株有:77-43-2（ZB₁）、77-93-1(ZB₁₇)、77-03-1（ZD₃）、77-121-3（ZE₁）、77-101-4（ZE₃）77-08-1（ZF₁）、77-91-1（ZG₁）和78-41-1(ZA₆₁)。对上海地方品种资源和当家品种进行抗性分类研究。品种资源中以“晚绿”种抗性最强。10个籼稻当家品种,以“庆莲16”抗性最强。18个粳稻当家品种中,“沪选19”抗性最弱。 1978年～1979年在发病严重的枫围公社和向化公社设立病圃。生长期间逐月采集标样,测定其小种消长,病圃每月出现1～2个小种,以ZF₁小种占优势。更多还原

【Abstract】 364 monoconidial isolates isolated from 186 samples of neck blast of 61 indica and japonica commercial varieties, were idendified on the Chinese diferential varieties, during 1977—1982. The resul has indicated that the isolates can be divided into 8 groups with 20 races for each; among 20, race Zhong F₁ had distributed most widely and has occurred in high frequency, indicating that it is the dominant race in Shanghai. Based on the studies of races of rice blast, 31 isolates have been selected and tested for stablility. The comparatively stable isolates are 77-43-2（ZB₁）, 77-93-1(ZB₂₇), 77-03-1（ZD₃）, 77-121-3（ZE₁）,77-101-4（ZE₃）,78-08-1（ZF₁）,77-91-1（ZG₁） and 78-41-1(ZA₆₁) of the varietal sources, Wan-Lu-Chong was found to be the most resistant to blast, Qing-Lian 16 was found to be most resistant to blast among 10 indica cultivars tested and Hu-Xuan 19 was found to be most susceptible to blast among 18 japanica cultivars. During 1978-1979, the increace and decline of races of rice blast have been detected in two blast nurseries, Feng-Wei and Xiang-Hua. The results pointed out that there are one or two races occurred each month, and Zhong F₁ is the dominant one.更多还原