What is the correct method for preparing fruit tree whitewash?
When fruit tree growing enters the winter season, many fruit growers choose to whitewash the trunks of their fruit trees to ensure the trees safely overwinter. In this way, they achieve the effects of heat preservation and cold protection, sterilization, and pest elimination. The operation of whitewashing fruit trees is very simple, and its control effect is also quite good. So how should fruit tree whitewash be prepared? Below, the editor brings you several preparation methods for fruit tree whitewash. Let us take a look!
1. Copper sulfate and lime whitewash
The formula for copper sulfate and lime whitewash is mainly prepared from copper sulfate, quicklime, and water. The preparation ratio should be controlled at about 1:20:70. First, use an appropriate amount of hot water to dissolve the copper sulfate, then add about 2/3 of the water to dilute the copper sulfate. Then mix the remaining water with the quicklime to make a thick lime milk. Wait until the two solutions are almost dissolved and their temperatures are similar, then mix the copper sulfate solution with the thick lime milk, stirring constantly, so that the two solutions are evenly mixed together to form the whitewash.
2. Lime and sulfur whitewash
The main formula of lime and sulfur whitewash is based on quicklime, sulfur, salt, biological oil, and hot water. When preparing lime and sulfur whitewash, the lime must be guaranteed to be free of impurities, light in quality, and bright in color. This is because if the granular lime is not completely slaked, the lime will produce a large amount of heat and burn the bark. Sulfur powder should be as fine as possible. When preparing, first soak and melt the sulfur powder and salt with hot water at about 50 degrees. Then add an appropriate amount of washing powder, and then melt the lime powder in boiling water at about 80 degrees. Then mix the two solutions, add salt and biological oil, and stir.
3. Lime sulfur mixture and quicklime whitewash
The formula of lime sulfur mixture and quicklime whitewash is similar to that of lime and sulfur whitewash. The only difference is that the sulfur is replaced with lime sulfur mixture stock solution, and ordinary cold water can be used instead of hot water. However, the preparation method and order are somewhat different. First, use water to slake the quicklime, then add oil and stir it with the lime water. After forming lime milk, pour in the lime sulfur mixture stock solution and salt water. Finally, stir it thoroughly to make the whitewash.
4. Slaked lime, cement, and yellow mud whitewash
Slaked lime, cement, and yellow mud whitewash is a kind of whitewash that can be prepared without chemical agents. It is mainly based on slaked lime, cement, and yellow mud. The preparation ratio should be kept at about 1:1:1.25. When preparing, directly add water to the slaked lime, cement, and yellow mud and stir, stirring constantly until it becomes a slurry, and then it can be used. Insecticides and fungicides can be added according to actual conditions. No matter which kind of whitewash it is, the principle of preparing and using it immediately should be followed during preparation, and attention should be paid to controlling the amount of each substance. For specific amounts, consult professionals.
The above is a brief introduction to the preparation methods of fruit tree whitewash. That is all for today's introduction. This article is for reference only, and I hope it can help everyone!