Millet sheath blight

Symptoms: The incidence rate of the disease in severely affected areas is as high as 70%, generally ranging from 10% to 50%, mainly affecting the stem and leaf sheaths. In the early stage, cloud like or irregular brown and grayish white patches appeared on the leaf sheaths near the ground. Sometimes the lesions merge to form larger cloud like spots, with dark brown edges and light brown in the middle. Mild cases can recover, while severe cases result in the death of 1-2 segments at the base of the stem and the formation of granular small fungal nuclei on the lesion. The disease can also spread to the top and cause damage to the leaves. The plot with severe disease affects grouting, and severe diseased plants die.

Pathogenic Rhizoctonia solani Kuhn AG-11-IA hyphal fusion group and AG-4 hyphal fusion group. According to North China, the main cause of damage to foxtail millet is the AG-11-IA hyphal fusion group, accounting for about 80%. AG-4 is relatively low, but has strong pathogenicity. The sexual state is Thanatephorus cucumeris5 (Frank) Don.

The morphological characteristics, transmission pathways, and disease conditions of the pathogen can be found in maize sheath blight.

Prevention and control method (1) Select varieties that are resistant to sheath blight. Like Jigu No. 14. (2) Adopting formula fertilization technology, reasonable fertilization, and reasonable dense planting. (3) At the initial stage of the disease, 0.5 kg of 1% Jinggangmycin aqueous solution was used for 40 kg of water, and the coarse spray was used for spraying.