First, the symptoms of long dark spots in Aloe
Black spot of aloe is a kind of bacterial disease that seriously affects the growth and quality of aloe. It can lead to the loss of aloe. At the onset of the disease, watery filamentous lesions developed on the leaves, followed by a nearly circular blackish brown lesion. The individual lesions were radial and surrounded by yellow or yellowish black halos. At the later stage of the disease, there were many dark brown particles on the lesions, and the leaf surface subsided, and the measurable portion of the mesophyll was completely lost.
Second, how do Aloe long black spots?
1. Select resistant varieties, the most susceptible species is Aloe variegated, followed by Yuanjiang Aloe, Aloe arborescens, Aloe vera, Aloe vera, etc., so choose disease resistant and highly efficient Curacao, Yuanjiang aloe planting is the best.
2, the new introduction of seedlings must be disinfected, generally with 50% carbendazim WP 1000 times fluid infiltration 5 to 10 minutes to dry can be planted. For the more serious diseased plants, the whole plant should be deeply buried, and the soil in the affected area should be disinfected with 50% carbendazim WP 1000 times solution and 70% thiophanate-methyl WP 800 times solution.
3. Ensure that the minimum temperature for aloe growth is above 8°C during planting and reduce and control the source of the disease. Take a single ridge planting to improve ventilation and light transmission conditions. Under the premise of applying base fertilizer, 0.1% potassium dihydrogen phosphate and 0.1% zinc supplement were added to enhance the disease resistance of the plant. At the same time do a good job of field drainage work to prevent stagnant water. During the frost period, comprehensive measures are taken such as raising the temperature with smoked smoke.
4, the initial stage of the incidence of aloe vera can be used 75% thiophanate-methyl WP 800 times, or 50% carbendazim WP 1000 times, or 70% thiophanate-methyl WP 800 times Conduct prevention and treatment.
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