Why does the right medicine prevent tomato late blight?
“The tomatoes in the shed were endemic with a late blight, and it was not proper to fight drugs. Is this something different?†In an interview with the reporter in Guancun Village, Datian Town, Shouguang City, Master Liu asked anxiously.
Reporter came to the shed to observe the diseased plant, found that the bottom of the tomato leaves have many irregular brown spots on the edge of the leaves, some leaves on the back of white mold, green fruit near the stem grow dark brown water stains hard plaque This is indeed the symptom of tomato late blight. Master Liu told reporters that he sprayed Puli to prevent and cure. The effect of spraying the medicine was still good, but he hadn’t had illness in three days. Coincides with the current tomato market is particularly good, and now the market traders run the border traders are to 2.7 yuan / kg over the acquisition price, watching this full shed tomato disease is getting more and more serious, you can break Master Liu!
Precise has a good effect in preventing and treating late blight of tomato. Master Liu also sprayed according to the concentration on the prescription. It can be said that it is the right medicine, but is it still impossible to cure it?
After careful analysis by the reporter, there are three reasons for this: First, Master Liu did not thoroughly remove the sick body from the shed before spraying, and only sprayed and controlled the diseased plants. The spores of pathogenic bacteria can spread over the winter in the soil with the diseased body, and they also spread and spread with air currents and water droplets. Therefore, farmers are reminded that friends must first remove the diseased fruit, diseased branches, diseased leaves, etc. before spraying. The whole canopy sprayed and prevented the plants from falling down on the ground and on the ground, completely killing residual pathogens and avoiding further infection. Second, spraying does not pay attention to environmental regulation. Late blight is like a high-humidity environment. At the same time as spraying, it should also be combined with enhanced ventilation to reduce the humidity inside the greenhouse, especially to avoid dewdrops. If necessary, it is also possible to conduct a short-term high-temperature stun (to maintain the shed temperature 40 °C 1-2 hours). Third, alternating use of medication. Using the same agent in a row, the resistance of the bacteria is faster. According to Master Liu, over the past years, Pleike has been sprayed to prevent and treat tomato late blight, which is also an important reason for late blight prevention. It is recommended that Master Liu take turns to control drugs, such as the use of 10% Kejia (cyazosulfate) suspension agent 5 or 69% of the Anke manganese zinc wettable powder or 52.2% fasting water dispersible granules and other control.
Combining the above analysis, the reporter recommended that Master Liu, before spraying, remove the diseased leaves and leaves on the diseased plant and on the ground, replace the control agent to spray the entire canopy, spray once every 5-7 days, spray twice consecutively, and strengthen the management at the same time. Air humidity in the shelter to prevent recurrence.
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