Morphological characteristics Spinach downy mildew is a fungal disease in spinach production, which mainly damages the leaves. The early leaves of the disease produce pale green spots and develop into pale yellow lesions, which later expand into irregular lesions. White mildew layer. The lesion spreads upward from the lower part of the plant and is prone to disease when there is dew at night. When the drought is dry, the diseased leaves are yellow, and when the leaves are wet, the leaves rot. In severe cases, the leaves all turn yellow and die; the spinach downy mildew is severely affected in low temperature and high humidity environment, sometimes even. Wall Tile Cutter,Light Duty Tile Cutter,Porcelain With Backing Plate,Tile Cutter With Single Rod NINGBO SANDING EDGE MECHATRONICS INDUSTRY AND TRADE CO., LTD , https://www.sandingedge.com
The pathogens of the disease are over-wintered by the hyphae on the host and seed of the victim or by the oospores in the diseased leaves. The springs produce conidia, spread by airflow, rainwater, agricultural tools, insects and farming operations, and spores sprout and produce buds. The tube is invaded by the host epidermis or stomata, and then sporangia are produced in the diseased part and reinfected in the field.
Control method:
1. Reasonable rotation, timely removal of the leaves of the former crops, and carrying out the deep burial and burning of the field; spraying the disinfectant with the new high-fat film 800 times on the ground to disinfect the soil; applying the new high-fat film before planting Seeding, sowing in time, immediately sprayed with a new high-fat film to maintain the seedling rate.
2, strengthen field management, rational close planting, scientific watering, prevent flooding, increase air release, reduce humidity; spray the strong stems in the spinach growth stage, so that the stems of the plants are thick, the leaves are enlarged, and the resistance of spinach is improved. Reduce the amount of pesticides and fertilizers, reduce residual toxicity, and improve the natural taste of spinach.
3, timely removal of diseased seedlings, advocate the implementation of crop rotation cultivation with other vegetables, strengthen management, reasonable water control, timely release of wind and humidity, sunny days can be through the high temperature shack sterilization method to create ecological conditions that are not conducive to the occurrence of pathogens.
4, using the agent treatment, the seed is coated with 2.5% of the season after the coating, spraying at the beginning of the disease, (1) 72% kelu WP 1000 times solution, (2) 50% Anke manganese WP 1000 Double liquid, (3) 53% Jin Lei Duoer WP 800 times liquid, used alternately.
5, chemical control, in the early stage of the disease should be sprayed according to plant protection requirements 90% of the flux cream WP, 58% metalaxyl manganese WP wet powder and other targeted agents for prevention and control, with the application of new high-fat film 800 times liquid enhanced The efficacy of the drug improves the utilization rate of the active ingredients of the medicament and consolidates the control effect.