３．苗、叶瘟的发生危害特点及防治策略技术措施（１）苗、叶瘟的发生危害特点稻瘟病当同时具备菌源、寄主、气候条件适宜时，就发生、发展、危害。秧田（苗）期的苗（叶鞘）、叶瘟，菌源主要来自带菌稻种和病稻草。稻种和病菌，当得到一定的水分、温度、氧气、养分时，病... 3. Miao, leaf blast harm characteristics and control strategies Technical Measures (1) the emergence of seedlings, leaf blast harm characteristics Rice blast when both bacteria source, host, climatic conditions suitable, the occurrence, development and harm. Seedling (seedlings) of the seedlings (leaf sheath), leaf blast, the source of bacteria mainly from the contaminated rice and sick straw. Rice species and germs, when a certain amount of water, temperature, oxygen, nutrients, disease ...