Aloe vera may develop black spot disease during the growth process. What pesticide treatment is better for us? The extent of the disease can vary depending on the different resistance of the aloe variety and the temperature. It is worth noting that if the typhoon, foggy weather, hail, and rain are very dense, and the temperature difference between day and night is above 10 degrees, it may also induce the disease and spread over a large area.
In the early stage of aloe black spot disease, watery filamentous lesions appear on the leaves of aloe vera, which can then develop into round black or brown lesions, and the edge of the lesion has a radiating shape with yellow or yellowish black around. Smudged lines. When the disease is late, there will be many dark brown particles on the lesions. The leaf surface of the aloe vera is somewhat sunken, while the mesophyll is completely lost, and it may form multiple infections.
At the beginning of the onset, it is best to choose 75% thiophanate-methyl WP 800 times solution, or 50% carbendazim WP 600 times solution, plus 150 ppm agricultural streptomycin. This method can be sprayed once every 5-7 days, even if it is sprayed 2-3 times, the effect will be better.
During the aloe planting period, it is necessary to ensure that the lowest temperature of aloe growth is 8 degrees. At this time, the source of disease is reduced and controlled, and the method of uni-row planting is used to improve the ventilation and light transmission conditions. If the base fertilizer has been applied, 0.1% potassium dihydrogen phosphate can be applied to enhance the disease resistance of the plant. At the same time, it is necessary to do a good job of drainage in the field. Here, it can be explained that the drainage ditch should be opened around the road, and the rain should be stopped and the water should be drained. Do not let the field have a large amount of water.
If the onset is heavier, its branches can be trimmed to reduce the spread of the source. It is also possible to spray 50% carbendazim WP 600 times solution and 70% thiophanate-methyl WP 800 times solution on the affected area for comprehensive disinfection.
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