Root rot (blight)
Symptoms: Roots appear brown, rot, hypocotyls shrink, dry, root hairs decrease, no or few secondary roots and other symptoms.
Prevention and control technology: 1. The disease is mainly prevention. Before sowing, it is better to use fludioxonil suspension seed coating agent or full-gold seed coating agent. 2. Intensify cultivation management after onset, spray foliar fertilizer; Humidity in wet plots, promote root growth. 3. Severe plots can be applied with 72% mancozeb urea cyanide wettable powder 600 times solution, or 58% mancozeb zinc methasor wettable powder 500 times spray corn seedlings base or irrigation roots.
Top rot
Symptoms: The upper leaves of the diseased seedlings are chlorotic, malformed, crumpled, or distorted; the edge tissue exhibits yellowish stripes and cuts or nicks or dead leaves.
Control technology: In the early stage of disease, 50% carbendazim WP, 80% mancozeb WP, 5% mycorrhizal water solution, 72% agricultural streptomycin soluble powder and other bactericides can be used to spray the heart and distorted the heart. The leaves need to be cut longitudinally with a knife.
Rough disease
Symptoms: The diseased seedlings are dark green, the internodes are shortened, the leaves are stiff, the width is short and thick, and the tufts are like a clivia. The leaves of the heart are small and the veins are intermittently transparent - “Mingmaiâ€, a waxy white bulge on the back veins of the leaves – “pulsesâ€.
Prevention and control technologies: prevention is the main method, and there are no effective rescue measures after the onset of disease: 1. Adopt integrated measures for planting disease-resistant or disease-resistant varieties, supplemented by agricultural control and chemical prevention. 2. The use of Rui Sheng, Gao Qiao and other attracting seed coating agents for seed coating to protect the damage after the emergence of SBPH. 3. When the seedlings are removed, the diseased seedlings are removed and taken out of the field and buried deep. 4. Increase the application of organic fertilizers, phosphorus and potassium fertilizers to improve the disease resistance of plants.
Dwarf mosaic disease
Symptoms: chlorotic stripes with different lengths and different shades of color are formed between veins. Interpulse mesophyll yellowing green, veins remain green, the formation of obvious symptoms of streak.
Prevention and control technology: Adopt comprehensive prevention and control measures centered on disease-resistant varieties and measures such as the prevention of diseases and the removal of toxic sources. 1. Use resistant varieties. 2. Properly sowing late to avoid or reduce lice transmission. 3. Use imidacloprid or special seed coating agents to prevent aphids and reduce the number of virus-borne mediators. 4. Remove field disease seedlings in time to eliminate the source of poison.
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