First, the harm symptoms Bacterial spot disease of tomato is mainly harmful to the leaves, but also harm stems, fruits and stalks, seedling stage and adult stage can be infected.
The leaves are infected. The first mature leaves from the lower part of the disease, and then spread to the upper part of the plant. At the beginning of the disease, water-stained dot spots appeared. After the enlargement, the spots were dark brown; round or near-circular, and the diseased leaves showed a yellow halo around the lesion. The lesions are brown or black in the middle and later stages of the disease. If the lesions occur on the veins, many lesions can be continuously produced along the veins of the leaves.
Stem infected. Initially, water-stained dots appeared. After the enlargement, the lesions were dark green, round to elliptical, and the edges of the lesions were slightly raised, showing a scab-like appearance.
The fruit and the handle are infected. Initially, small spots of water-stained spots were formed, and when the spots were slightly larger, the lesions were brown, round-to-elliptical, gradually enlarged, the lesions turned black, and corked sores were formed in the center.
Seedling disease. Occurs mainly on the leaves, producing round or near-circular dark brown spots with yellow halos around the periphery.
Second, prevention and control measures (a) selection. Seeds were collected from disease-free seedlings and disease-free seeds were selected.
(b) Seed treatment. Seeds of commercial seeds should be treated well before sowing. They can be soaked in warm water at 55°C for 10 minutes and then transferred to cool water. After cooling, remove and germinate after drying.
(c) Passage rotation. Heavy-intensity plots advocate the implementation of 2 to 3 year rotations with other crops to reduce the source of field bacteria.
(d) Strengthen field management. Open the drainage ditch to reduce the groundwater level, close the plant properly, open the ventilation and ventilation in a timely manner, reduce the humidity in the greenhouse, increase phosphorus and potash fertilizers, and increase the disease resistance of the plants. Use clean water for watering.
(five) clean up the pastoral. At the early stage of the disease, the pruning is performed in time, the diseased leaves and the old leaves are removed, and after the harvest, the pastoral area is cleared to remove the diseased body and brought out of the field to be buried or burned. Deeply turning the soil and protecting the ground to fill the ditch, the high temperature and high humidity can promote the decomposition and rot of the residual tissue, reduce the survival rate of pathogenic bacteria, and reduce the re-exposed bacteria source.
(6) Chemical control. In the initial stage of onset of spraying, spraying once every 7 to 10 days, continuous control of 2 or 3 times. Pharmacy can be selected 47% Garethon WP 600-800 times (125-165 grams per mu), 72.2% Prec Water-soluble liquid 700 times (130 grams per mu), and amine wettability Powder 800 times liquid (mu of 125 grams), 30% DT wettable powder 600 times (mu of 165 grams), 77% can kill WP 700 times (130 grams per mu) and so on.
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