The loquat tree came out in white spots. What should I do?

In fact, generally speaking, healthy loquat leaves not only have no spots, but also are dark green and bright in color, and will not appear any diseases. If spots appear, it must be that the leaves are damaged by germs. Since it is a disease, it will certainly affect the normal development of loquat trees and fruits. As we all know, leaves, as an important organ of fruit trees, will produce nutrients needed by fruit trees through photosynthesis. If leaves are diseased, it will seriously affect their growth and development.

For loquat, leaf diseases will also affect fruit quality and even yield, and also affect the growth and development of the tree. Then, what kind of spots appear on the leaves, and will they affect the quality of fruits and the growth of trees?

That's for sure. This spot is called leaf spot. Leaf spot diseases mainly include gray spot disease, angular spot disease, spot disease and circular spot disease, among which the first three diseases are common diseases that damage leaves in loquat, and among these three diseases, gray spot disease is the most common and the most common. The three diseases on loquat leaves are not single occurrence and damage, but often mixed occurrence, and the lesions are similar, so it is very difficult to distinguish them. Therefore, these three diseases are generally referred to as leaf spot. The occurrence of round spot disease is less, and the harmful symptoms are the same as angular spot disease, so we won't introduce it here, but mainly introduce the other three diseases.

gray leaf spot disease mainly damages loquat leaves, which can be divided into chronic and acute types. Chronic gray spot disease, after damaging loquat leaves, leaves will appear pale yellow circular spots at first, and then gradually expand. The spots are irregular, generally irregular and round, with grayish white or grayish yellow in the middle and dark brown bands at the edges. These black spots are scattered on the spots. Acute gray spot disease is dry at the edge of leaves, and then the whole leaves are withered and scorched. Acute gray spot disease not only harms leaves, but also harms fruits, making the fruits sag and produce black spots, and finally leading to rot and fall off.

Spot disease, the spot will be small reddish-brown spots at the beginning, and then gradually expand into a circle, and when several spots expand and connect together, they will form irregular spots. The center of the spot is grayish yellow, and the periphery is reddish brown. In the later stage, there will be many black spots caused by bacteria. Generally speaking, the biggest difference between spot disease and gray spot disease is that the spot is not as big as gray spot disease, and the black spots appearing in the later stage will be finer.

angular leaf spot is called angular leaf spot because of its angular shape. Generally, angular leaf spot will only harm loquat leaves. At first, the spot is reddish brown, and there are usually yellow halo around the spot. After the damage to the later stage, the central color of the lesion will turn gray-yellow, and then black moldy spots will grow. After the spots gradually expand, they will take the veins as the boundary, so that the two sides of the leaves will gradually scorch and fall off.

The occurrence conditions of these three kinds of leaf spot diseases are: first, the temperature is warm, and second, there is more rain, that is, it is particularly easy to occur in warm and humid conditions, such as when leaf spot diseases occur frequently after spring recovery. During the year, there will be many infections, which will spread rapidly in autumn except in spring. In summer, gray spot disease and angular spot disease of these three diseases will also occur more easily. Under normal circumstances, loquat orchards that can cause leaf spot disease are either unable to keep up with management, resulting in weak tree potential or poor site conditions, such as insufficient soil fertility and poor drainage conditions.

Therefore, if we want to prevent leaf spot disease from harming loquat trees, fundamentally, we must strengthen cultivation management, make sufficient efforts in soil management, fertilization and irrigation, pruning and shaping, etc., so as to enhance the tree vigor and improve the disease resistance of loquat trees. Specifically, first, we should pay attention to fertilization, in addition to applying base fertilizer once a year, we should also apply phosphorus and potassium fertilizer at flowering stage, fruit growth stage and other periods when nutrition demand is high; Second, it is necessary to do a good job of pruning, ensure that the tree shape is reasonable, and enhance the permeability of the tree potential and crown; Third, we should pay attention to drought and drainage, loquat is afraid of both drought and waterlogging, pay attention to irrigation in dry season and drainage in rainy season; Fourth, do a good job in clearing the orchard, remove dead branches, dead fruits, fallen leaves, etc. in time, and dig deep into the soil to improve the orchard environment and improve the disease resistance of trees; Fifth, do a good job in the prevention and control of other pests and diseases, so that loquat trees have a strong tree potential.