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Lime control rose powdery mildew
After the beginning of autumn, rose powdery mildew season. Since last year, the author has used lime water for prevention and control and felt better. Specific practice is to take 25 grams of lime dissolved in 500 grams of water, use the brush pen and lime water to wash the lesions, wait a few minutes, then rinse with water. After the water is dried, it can be clearly seen that the bacteria attacked the wounds of the leaves. The next day, the leaves were no longer regenerated, indicating that the spores had been killed. Lime's chemical name is calcium hydroxide, which is one of the three alkalis. Does it hurt flowers? Experiments show that using lime to control powdery mildew does not damage rose flowers. Powdery mildew occurs first from weakly growing plants. If it is not too old, why is the flower long? Should consider the soil problem first, the Chinese rose spends fertilizing, may cause the pH value to drop, the soil acidifies, and the Chinese rose flower's request to the soil is the neutral alkalinity. Acidic soils are not conducive to the absorption of nutrients from roots, which is probably one of the causes of plant weakness. According to the results of relevant experts, the application of appropriate lime in acidic soil can adjust the pH rise to neutrality and improve the plant's absorption status. From this point of view, a small amount of lime water is not only harmless to the Chinese rose flower, but also has benefits. As for the leaves smearing lime water, in addition to killing the spores for a few minutes, the leaves will not be burned. The result of the experiment was also the same. I believe that the powdery mildew was derived from pottery soil, so a thin layer of lime powder was sprinkled on the surface of several potted soils. Later, the development of these pots was normal. Last year, the author inserted a few trees, did not transplant after survival, this spring is weak, are suffering from powdery mildew, the author used a brush to dip lime water to scrub the branches and leaves, and then washed with clean water, and then these several trees to restore all vitality.