How to prevent bacterial leaf spot in melon
Leaf spot disease is one of the important diseases of melon and it is widely distributed. It occurs everywhere, and it usually occurs in the spring and autumn. The incidence rate is 10%-60%, and serious plots or sheds can reach 100%, which can reduce production by 10%-30%, and can reduce production by more than 60% when it is severe. The disease can also damage cucumbers, melon, gourd, bitter gourd and other vegetables.
[Symptoms] The disease is harmful to leaves, stems, and melons. The damage to the leaves is more serious. May occur in all growing stages of melons. The damage to the cotyledon was submerged in a submerged depression in the water, and it turned yellowish brown. The true leaf was damaged and it was initially oil-immersed and gradually turned into a light-brown polyhedron to a nearly circular spot. The edge often had a rust-like yellow oil-immersed ring, and finally it was translucent and cracked when dry. When the air is wet, the lesions blew out with pale tan pus. Fruits and stems were infected, the lesions were oil-immersed, dark green, cracked or ulcerated, and overflowed with bacteria. The incidence of fruit, bacteria can be extended inward to the seeds, so that seeds carry bacteria.
[Implications of Onset] The pathogens in the seeds or in the soil with the diseased body overwintering. Invasion through wounds or pores, water holes, and lenticels, spread through rain, water, insects, and condensation after onset. The growth temperature of germs was 1-35°C, suitable temperature for development was 20-28°C, growth was stopped at 39°C, and death was at 49-50°C. High air humidity, or rain, or condensation at night is more conducive to disease.
[Control methods]
1. Use disease-free seeds, sow seeds with warm water of 50-52°C for 30 minutes before sowing. Or use a seed weight of 0.3% of 47% Garnett's wettable powder dressing.
2. Use disease-free soil to raise seedlings. After pulling, remove defoliant defoliant and non-melon crops for more than 2 years.
3. Reasonable watering to prevent flooding. Flooding and dehumidification should be paid attention to in the protection area, and the time for condensation on the surface of the plants should be shortened. Attention should be paid to agricultural operations after the dew has dried to prevent and control field pests in time.
4. Chemical control. At the beginning of the disease, 5% of Garnett dust 15 kg/ha can be used for dust control. Also available are 47% Garnett WP 800x, or 50% WP 500x, or 25% Dibutyrazine 500g, or 25% thiazolyl. Azole 300 times, or spray control with 5000 times neomycin.
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