Plum is a very common fruit, in the summer you can eat ripe plums, the taste is crisp and sweet, the market sales volume is large, many people like to buy and eat. At present, there are more and more people who specialize in planting plum seedlings, so what is the disease when its leaves appear dark red dots? How to prevent it?
First, what is the disease of plum leaves with dark red dots?
Plum leaves have dark red dots are generally red dot disease, plum seedling red dot disease harms the leaves and fruits of plum trees and plum plants, pathogenic bacteria infect leaves in the early stage of the onset of leaf disease on the leaf surface to produce orange-yellow, slightly raised round spots, the edge and the health of the boundary is clear, with the expansion of the spot. The color gradually deepens, and the mesophyll of the diseased part is also thickened, and there are small dark red particles on it, that is, the conidia of the pathogenic bacteria. Later leaves are concave on the front and raised on the back, producing many small black particles with ascomycete shells of pathogenic bacteria, containing a large number of ascomycetes, when the disease occurs seriously, almost every leaf is covered with disease spots, and the leaves turn red and yellow, showing a curly state, causing early defoliation. When the fruit is infected, it also produces orange-yellow round spots on the fruit surface, the lesion is initially raised and edematous, the edges are not clear, and the later stage is wrinkled, and the black-brown dots are scattered on it, and the fruit is deformed, and the growth is easy to fall off, and it cannot be eaten.
Second, the prevention and treatment method of red spot disease of plum seedlings
1. Remove the source of the disease: completely remove the diseased leaves and fruits in the orchard in the autumn, burn them centrally or bury them deeply, and eliminate the source of overwintering bacteria.
2. Spray protection: Spray 1:2:200 Bordeaux liquid at the end of flowering of plum trees and when the leaf buds are open.
3. Pharmaceutical protection: Spray 75% oxime and pentazool (take the enemy stable), or 2% chlormycin (add rice), 14% copper ammonia hydranthin 300 times liquid, or 50% phytophenant 600 ~ 800 times liquid, or 80% sterile treasure 800 ~ 1000 times liquid, or 80% Dasheng 1000 times liquid, spray 70% methyl thiophexam ultra-micro wettable powder 1000 times liquid in the rainy season. It can effectively prevent and treat Li red spot disease.
After reading the above, we can know that plum seedlings have dark red dots are generally red dot disease, which will lead to poor fruit growth and easy to fall off, can not be eaten, for farmers is a big loss, so it needs to be prevented in time, the above Xiaobian shared some related prevention and control methods for everyone, hoping to help everyone!