摘要
了解稻纹枯病发生规律及生物制剂的防病适期是安全有效地防治单季直播稻纹枯病的关键。1998～1999年间对浙江嘉兴市双桥镇单季直播稻丙96-42的纹枯病进行了系统调查,从发病初期至病害停止期每隔3～7天以病株率和病情指数监测病情,并作了生防菌P98115和井冈霉素在不同病情时不同使用次数与病情发展的关系及对产量影响的小区试验。结果表明:单季直播稻纹枯病比传统移栽稻发病提早10～15天,在8月下旬或9月上旬达到高峰期并持续30天以上。病情在轻、中、重度时用药1次均无法起到控制作用,产量与对照不用药无显著差异;用药2次以上的病情与产量因施药时的病情及生物制剂本身的特性而有很大差异。根据单季直播稻纹枯病的发病特点,生物制剂防病宜在发病较轻时进行,并适当增加用药次数。
Understanding the disease development of sheath blight of rice (SB) and the suitable time for spraying bio-pesticides is the key for safety and effective management of the disease on directly-row-seeded Japonica rice (DRSJR). During 1998 - 1999 a survey on disease development of SB on variety Bing 96-42 of DRSJR was conducted at Shuangqiao, Jiaxing City of Zhejiang Province. The disease was measured with disease incidence and disease index every 3 - 7d after the disease initiated. A biocontrol agent P98115 and an antibiotic Jingangmycin were used in the experiment plots for management of the disease by different spraying times at different disease index (DI) and to test their effect on the yield. The results showed that the disease on DRSJR appeared 10 -15d earlier than on the traditional transplanted rice. The disease reached peak in the end of August or beginning of September and maintained for more than 30d. There was no effect on the disease development when the bio-pesticides were sprayed once at different DI and the yields were not significantly different from the control. The disease development and the yield greatly varied with the DI and characteristics of the bio-pesticides when spraying for more than twice. We suggest that it is necessary to spray the bio-pesticides at low disease severity and increase the possible spraying time based on the disease development of DRSJR.
出处
《植物保护学报》
CAS
CSCD
北大核心
2003年第2期113-118,共6页
Journal of Plant Protection
基金
国家自然科学基金(39870501)
浙江省科技厅及国际水稻研究所(菲律宾)资助
关键词
单季直播稻
稻纹枯病
生防制剂
病情指数
用药次数
directly-row-seeded Japonica rice, sheath blight of rice, bio-pesticides, disease index, times for spraying
