1, the role of trunk whitewashing: prevent the trunk from burning in the sun, prevent late frost, prevent peeling, increase the reflection ability of trees to sunlight, avoid freezing at night during the day, and reduce freezing damage.
2. Preparation method and application method of whitening agent: 0/0 part of quicklime/kloc, 2 parts of stone sulfur mixture stock solution (or 2 parts of commercial crystal stone sulfur mixture), 0/part of salt/kloc, a little oil (both animal and vegetable oil), 2 parts of clay, 40 parts of water, and a small amount of targeted pesticides can be added. Firstly, the quicklime is dissolved in water, the residue is filtered, the melted salt and grease are poured in, and the mixture of lime and sulfur is finally added. After mixing well, paint the trunk white. The albino parts are mainly at the base of the trunk (the height should be 0.6~0.8m) and the middle and lower parts of the main branches of fruit trees, and the effect is better if conditions permit. Whitening is done twice a year. After defoliation and early spring. The time for painting in early spring should be determined as soon as possible without freezing before drying, and the newly planted trees should be painted immediately after planting.