Symptoms and Control Measures of Rice Blight
When it comes to the breeding season, every year, many farmers encounter seedlings with this disease hazard. This disease is common in dry seedlings and the damage is not small, but as long as it can be prevented and identified early, it is still very good. Now describe its symptoms and prevention and control measures as follows:
1. Pathogens: Pathogens used to be considered Fusarium and Rhizoctonia solani in the past, but from the perspective of future research and prevention and control practices, they should be Pythium breviflora. The bacteria passed winter in soil, and after the sowing of rice, the germs began to invade the rice seedlings. The seedlings were severely attacked under water shortage conditions. The disease mostly occurred in paddy rice fields, and was the main disease of paddy fields.
2. Symptom identification: After the two-leaf stage of paddy rice, the tips of the seedlings were atrophic and the root hairs were sparse. Initially, they were clustered on a seedbed and soon spread across the entire bed. After the 4-leaf stage of the seedlings, the onset of symptoms was sudden blue-green, and the clusters of leaves of the seedlings were wilting and then withered.
3, chemical control: In the past, the use of enemy cockroach control, the effect is poor, later changed to metalaxyl or metalaxyl manganese zinc control, control efficiency reached 95%. Before sowing with rice, use 25% metalaxyl WP 100g or 58% metalaxyl MnZn WP 150g, mix 50kg rice seed, also in seedling 1.5 leaf stage, use 25% metalaxyl Wet powder 0.75 g per square meter or 58% metalaxyl manganese zinc wettable powder 1 g per square meter, watered 2 to 2.5 kg with watering can spray on the bed, one of the above two options can be used.
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