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Symptoms Downy mildew mainly damages the leaves and also harms pedicels and pods. The lower leaves were the first to become infected, yellow spots with indistinct edges appeared, and gradually expanded. Due to the limitation of the veins, the lesions were polygonal or irregular yellow-brown to dark brown lesions; the tissues gradually became necrotic, and many lesions were connected to make the leaves Part or whole leaves dry. When the weather is wet, loose white mold layer can grow on both sides of the lesion, and the back of the leaf is more obvious. Harmful pedicels, seed pods can cause deformities, bends and puffiness, and a layer of mildew-like fungus can grow on moisture.
The pathogen, Feronospora parasitica (Pers) Fr, belongs to the flagellin subphylum, called parasitic fungus. Mycelium is colorless and non-separated. The frosty layer on the lesion is the vegetative propagative cysts and sporangia of the bacteria. The cysts resemble dendritic branches and the sporangia are oval; the bacteria can produce round spheres and wall thicknesses in diseased tissues. Sexual oospore.
The characteristics of the disease? The initial infection of the disease bacteria mainly from the field of various infected cruciferous vegetables on the sporangia, sporangia through air or wind and rain, in the presence of moisture and high humidity, temperature 7 - The initial germination of the germinated long bud tube was performed at 13 degrees Celsius; the oospore could also infect under the same conditions. When the conditions are appropriate, the onset of disease occurs within 3-5 days, and a large number of new sporangia are generated after the onset of the disease to re-infect frequently. Seeds can also cause seedlings to cause hairbombs. The occurrence of diseases requires rainy and wet and slightly cold weather conditions with large temperature difference between day and night. Hebei Province has more occurrences in early winter at the end of winter; vegetable fields are low in humidity, soil is more viscous, and fertility is poor. Incidence is also heavier. Excessive management, overgrown with weeds and unpleasant fields in the fields are also conducive to hair growth.
?? Control of cauliflower downy mildew should take a good job of cultivation and disease control and timely spraying comprehensive prevention and control measures.
?? 1, from the disease-free strains, seed collection, seed removal; clean-up, destruction of field disease and reduce the initial infestation.
?? 2, vegetable field deep soaked soil, increase the quality of organic base fertilizer, leveling the surface so that irrigation and drainage smooth, timely cultivation and weeding conducive to field ventilation and humidity.
3, one of the following agents may be sprayed in the early stage of the disease: (1) 58% of DRY Mn-Zn wettable powder 600 times; (2) 64% antivirus WP 500 times; (3) 30% Oxychloride Copper Suspension 300-400 times; (4) 40% Ethyl-phosphine aluminum wettable powder 250 times. Spray once every 7-10 days, continuous spray 2-3 times. In order to reduce the resistance of the bacteria, the above agents are preferably used interchangeably.
Cauliflower downy mildew
Cauliflower downy mildew is an important disease of cauliflower.