This is to prevent pests. Ash tree is lime water (some mixed with butter to enhance adhesion), which is used to prevent insects from climbing the tree and hiding under the bark for the winter before winter. The tape is smoother and it is more difficult for insects to climb trees.

In fact, the main purpose of taping the trunk is to prevent grasshoppers. Locust is a particularly serious pest in forestry in spring, which mainly harms street trees such as poplar, Sophora japonica, paulownia, Prunus mume, Toona sinensis, begonia, cherry blossoms, and economic trees such as persimmons and oranges. Especially in a large area of Yang Shulin, it appears in the largest number.

Extended data

1, damage characteristics and reproduction law of scale insects;

Grasshoppers mainly live on nymphs and female adults. They gather on axillary buds, twigs and leaves of trees and suck the sap of trees. The damaged seedlings will lose their leaves in the early stage, the branches will wither in the later stage, and even weaken or even die in severe cases. Moreover, they often migrate in groups, which will cover nearby walls and floors and even get into residents' homes, affecting their health.

Grasshoppers can basically reproduce one generation a year and spend the winter in the form of eggs in soil cracks, weeds or litter. Bian Xiao made a chart about grasshopper's reproductive law, which I believe will make everyone more clear.

2. The harmful time of grasshoppers:

It can withstand low temperature, and it can hatch above 0℃, so it was unearthed in trees very early, and it was the earliest scale insect, with a large number and rapid spread.

Every year in mid-February, the tree basically begins to climb. After the grasshopper climbs the tree, the surface will slowly secrete a layer of wax, which makes it difficult for drugs to penetrate into it and has high drug resistance. In April and May every year, the scale damage is the most serious.

Baidu encyclopedia-grasshopper