The pathogenic bacteria of melon bacterial fruit spot disease are overwintering on seeds and soil surface and can spread through wind and rain, insects and agricultural operations, and infect from wounds and stomata. After germination of the seeds of the bacteria, the bacteria invade from the cotyledon, causing the onset of the seedlings. At the same time, pathogenic bacteria can infect zucchini, pumpkin, watermelon, cucumber and other crops. High temperatures and high humidity in the shelter are easy to develop. It is worth noting that when the pathogenic bacteria of the disease infects the fruit, it penetrates through the lenticels on the pericarp 1 to 3 weeks after fruiting. Once the young melon begins to turn color and wax powder forms on the surface of the peel, most of the lenticels are closed and can effectively prevent bacteria from continuing to invade. Therefore, when the symptoms of the disease appear, the fruit has changed color and is almost mature, but the pathogen has already invaded in the young period. Therefore, it would be too late to wait until the symptoms of melon show symptoms.
In response to this, vegetable growers are advised to take the following precautions in advance:
First, do a good job of seed disinfection. Can be soaked in warm water at 50°C for 3 hours, remove and germinate after drying, or rinse with water after soaking in 10% trisodium phosphate for 20 minutes. Pay attention to the concentration of the agent and soaking time to avoid affecting the seed germination rate. In addition, the small nursery plant may be operated in an irregular manner, and the seedlings may also be poisonous. It is recommended that the growers raise seedlings from the normal nursery.
Second, do a good job of soil disinfection. Proposed rotation. Prior to planting, the weeds in the shed were cleared and deep-swept. During the colonization, the shed was first sterilized. When transplanting, the VT600 liquid was used for irrigating or irrigating the root.
It is recommended that ridge cultivation, reasonable watering, prevent flood irrigation, pay attention to ventilation and dehumidification, reduce the time of condensation on the surface of plants, agricultural operations after dew dry, timely prevention and control of pests in the greenhouse. Bring the diseased plants out of the shed in time. Cotyledons have many diseases and should be dealt with promptly. When the melons are in two leaves, select the scissors with the disinfected scissors to cut off the cotyledons. Be careful not to tear by hand and bring the cotyledons out of the shed.
Again, it is recommended to use plastic bag bagging. When the melon grows into a large goose egg, the plastic bag is opened at the bottom of the set and removed in 4-6 days. At this time the melon skin gradually aging and the formation of wax layer, enough to resist the invasion of bacteria.
Finally, pharmaceutical control. When the muskmelon blooms, spraying chlorothalonil or amisida together with midomycin or Ningnanmycin every 10-15 days to prevent various diseases, especially bacterial diseases. Or spray 2000 times of streptomycin prevention, or use 47% Garnett WP 1000 times, or 50% WP 1000 times, or 27.12% Copper 1000 times, or 30% King Copper 1000 times spray, or 50% diclofenac copper (DT) fungicide 1000 times, once every 10 days. Note that the melon larvae are relatively sensitive to copper preparations. Therefore, it is necessary to dilute the concentration of the copper preparation by one half. On the one hand, the control effect is still guaranteed, and on the other hand, the growth of young larvae is not affected.
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