Pesticide prevention and control measures for diseases and insect pests of green leafy vegetables in Compositae

First, downy mildew mainly harms the leaves. The leaves begin to appear pale yellow near-circular or polygonal lesions. When the humidity is high, the white mold layer on the back of the leaf. In the later stage, the lesions turned to a yellow-brown color, and eventually the leaves were yellow and inedible. In case of low temperature and high humidity weather, high planting density, low stagnation and other serious diseases. Control method:
1, selection of resistant varieties.
2, agricultural control: strengthen cultivation management, deep pit sorghum planting, timely drainage. Avoid excessive planting. Rational fertilization, increase the application of phosphorus and potassium fertilizer.
3, chemical control: initial use of 64% anti-virus 矾 wettable 500 times liquid, or 90% ethyl phosphorus aluminum 800 times liquid plus potassium permanganate 1000 times liquid, or 25% toxic mildew wet powder 800-1000 times liquid , or 58% toxic mycelium aluminum zinc 500-800 times, or 65.5 % Plex water agent 800 times, etc., alternately used 3-4 times, spray once every 7-10 days.
Second, the virus diseased plant is dwarfed, the leaves are shrunk, deformed, the leaves are chlorotic or the leaves are unevenly colored, showing a mottled shape. In the field, it is mainly caused by aphids, where high humidity and drought occur, and light rainy years occur. Control method:
1, selection of resistant varieties.
2, agricultural control: in addition to weeds, timely removal of diseased plants, increase the application of phosphorus and potassium fertilizer, avoid partial application of nitrogen fertilizer.
3. Control mites in time.
4, chemical control: cotyledon to 6 leaves in the early stage with 1.5% phytopathogenic 1000 times solution plus 20% virus A600 times solution, or mixed fatty acid (8.3 antagonist) 100 times solution, or virus A wet powder 500 times solution, etc. Spray alternately.
Third, sclerotinia disease mainly damages the base of the stem. It is first water-stained, then it expands all the decay, and finally produces black fecal sclerotia inside and outside the stem. The leaves of the diseased plants turn yellow and wither until the whole plant is dead. The humidity suitable for the disease is about 20 ° C, and the relative humidity is above 85%. Continuous cropping, partial application of nitrogen fertilizer, high planting density, and poor drainage often cause the occurrence and prevalence of sclerotinia. Control method:
1, selection of resistant varieties.
2, seed disinfection: seeding with 16% saline before planting twice, remove the sclerotia and sputum particles floating on the water surface, the sinking seeds are washed with water and then sown.
3, agricultural control: deep ploughing soil, water and drought rotation, strengthen field management, especially water and fertilizer management, timely removal of diseased plants.
4, drug control: early onset, immediately spray medicine. Commonly used agents are 40% smear wettable powder 800-1200 times liquid, or 50% chlorpyrifos wet powder 1000-1500 times liquid, or 40% sclerotium net wettable powder 500 times liquid, or 50% speed Ling Wet Powder 1500-2000 times solution, or 70% methyl thiophanate WP 700 times solution. Or use 1000 times liquid of Shigao powder and use it alternately. Spray once every 7-10 days, even spray 3-4 times.
Fourth, powdery mildew mainly harms the leaves. The leaves were newly born with white powdery mildew with no obvious edge. Then the white powdery mildew turned white powder spots. After expansion, they merged into each other. In severe cases, the whole leaf surface was covered with white powder, and the leaves were yellow and lost their edible value. It is easy to induce the disease under warm and humid conditions, heavy fog and heavy weather conditions. The cultivation and management are extensive, the watering is too much, the nitrogen fertilizer is applied, the vegetable plants are long, and the ventilation is bad. Control method:
1. Agricultural control: strengthen field management, pay attention to ventilation and light transmission, reduce humidity, strengthen fertilizer and water management, and increase phosphorus and potassium fertilizer.
2. Chemical control: 15% powder rust-proof wet powder 1000-1500 times liquid, or 50% sulfur suspension 300 times liquid, or 40% triazolone carbendazim wet powder 1000 times liquid, 7 - Spray once every 10 days, even spray 2-3 times.
5. Rust mainly harms leaves and petioles. At the beginning of the leaf, the yellow and yellow blister spots appeared on the front and back sides of the leaf, and the late stage rupture of the plaque, emitting a fresh yellow powder (sia spore). In severe cases, the blister is densely covered, and the front and back of the leaf are covered with a layer of conspicuous bright yellow powder. At the late stage of growth, the leaves appear brown to dark brown blister on the fresh yellow erythema (the pile of winter blisters), and the leaves have no edible value. It is beneficial to the disease under warm and high humidity, fog and heavy weather conditions. In addition, the incidence of low-lying terrain, poor drainage, excessive planting density, and excessive application of nitrogen fertilizers are also serious. Control method:
1. Agricultural control: clean the field, strengthen the field management, properly close planting, and avoid partial application of nitrogen fertilizer.
2, chemical control: in the early stage of the disease, timely spraying drugs to prevent disease. The agent can be alternately sprayed with 15% powder rust WP 1500-2000 times solution, or 25% enemy de-emulsion 2000-3000 times solution, or 12.5% ​​carbamide wet WP 2000-3000 times solution, or 30% pediatric emulsifiable concentrate 1500 Double liquid, spray once every 7-15 days, even spray 3-4 times. Special attention should be paid to the prevention and treatment of the disease center.

200*1200mm Wood Look Tiles

The 200*1200mm wood look porcelain tile completely collects and restores the texture of natural wood through 3D digital printing technology. It is natural and realistic. It seems to enjoy the natural log charm.it is like feeling the tenacity and enthusiasm after thousands of years by touching its surface.The advantage of this Wooden Tiles is as following:

Wooden tiles wall,Wooden tiles exterior,Wooden tiles design for floor,Wooden tiles bathroom floor,Wood effect tiles

Foshan Castel IMP&EXP Co.,Ltd , https://www.fscastel.com