Bacterial blight is a globally distributed soil fungal disease. It has a high degree of rot in the soil and is a root disease of many crops. In addition to strawberries, it also harms more than 160 cultivated plants and wild plants such as cotton, soybeans and vegetables. The main damage to buds, sprouts, stipules, and petiole bases on strawberry results in damping-off during seedling stage, stem and leaf spoilage, root rot and rotten fruit in adult plants.
First, the symptoms
Plants on the base of the disease, in the near-ground part of the newborn matte brown spots, gradually sag, and grow a beige to light brown spider nest mycelium, and sometimes can connect several leaves together. When invading the base of the petiole and the stipules, the diseased part stands upright, and the leaves fall down. Injury before flowering causes the inflorescence to gradually wilt and wilting. The buds and buds gradually become sluggish after being infected, and are blueish or stumbling, and then turn dark brown and die. Stem base and root damage, cortex decay, dry up above the ground easy to pull up. From juvenile fruit, green fruit to ripe fruit can be infringed on the surface of the diseased part of the disease, dark brown irregular patches, stiffness, and ultimately lead to dry rot of the whole fruit, the temperature can be high when the mycelia grow out of the above. The coloured berry is onset, the disease area becomes brown, and the outer part often has a wide brownish leucorrhea. The red part turns slightly red, bright and contrasting, causing wet rot or dry rot, but not long gray moldy matter. The difference with Botrytis cinerea.
Second, the incidence of the law
The pathogenic bacteria of strawberry bud blight are Rhizoctonia nucleus of the semi-known phylum Subgenus. The mycelium or sclerotia is overwintering in the soil with the diseased body, and it mainly spreads with diseased seedlings and diseased soil. In open field cultivation, spring is the main period of onset, and the suitable temperature for onset is 22°C to 25°C, and it is easy to develop on conditions of hypertrophy and water. The high temperature of the protection site, poor ventilation, high humidity, and excessive planting can easily lead to the spread of disease.
Third, control methods
1. Try to avoid planting and planting strawberries in the area where blight occurs. Otherwise, solar energy must be used to disinfect the soil.
2. Appropriately sparsely planted, reasonably watered, ensure ventilation, and reduce environmental humidity.
3. The protective ground should be timely ventilation, rapid ventilation after irrigation, reduce indoor humidity.
4. Remove the diseased plant in time, and it is forbidden to reproduce the strawberry with the diseased plant as the mother plant.
5. Chemical control. Suitable agents include 10% polymycin wettable powder 500-1000 times liquid, 10% liquid dry suspension 300 times liquid, enemy water solvent 600 times, starting from budding stage, about 7 days 1 time, spray 2-3 times. Under greenhouse or greenhouse cultivation conditions, use 5% chlorothalonil dust agent 110-180 grams per acre, place 5-6 points, ignite the evening, close the shed overnight, smoke once a day for 7 days, smoke 2-3 times.
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