1, fertilizer damage caused high pear leaves to scorch.

After the spring rainfall, the tip or front leaf edge of young trees or young trees suddenly turned yellow and scorched in a large number within 2 ~ 3 days, and the boundary was obvious, and it quickly expanded to more than half of the leaves, resulting in a large number of fallen leaves. Digging out the roots corresponding to the branches with many burnt leaves shows that a large number of white absorption roots turn brown, dry and die, and sometimes incomplete dissolved fertilizers can be seen. This burning is caused by the damage of fertilizer.

2. Pear leaves scorched due to water imbalance.

During the summer drought, some pear varieties suddenly turn yellow and scorch at the leaf edge or tip around the extended branches and long branches, with obvious boundaries and rapid development. Most or all of the leaves are yellowish brown and crisp, and the leaves at the front end of the short and medium fruit branches turn yellow in severe cases. The causes of this scorch disease are complex, which are related to the sudden increase of leaf water transpiration, root weakness, hypoxia and suffocation, and the high concentration of soil solution leading to water reflux.

3. Pear leaf scorch caused by waterlogging

There is more rain in summer and autumn, and the low-lying land in the pear garden has accumulated water for a long time. The leaves on the upper branches of pear trees gradually turn yellow, scorch and fall off, the absorption roots under the trees rot and become sour, and the lenticels on the lateral roots increase and turn blue. This burning is caused by waterlogging and rotten roots.