Walnut, also known as walnut, and peach, belongs to the walnut family and is one of the "four major dried fruits" in the world. Walnuts are rich in nutrients and are known as "brain-removing artifacts". They are also known as "longevity fruit". Walnuts are resistant to disease during growth, but they still encounter some disease attacks. Walnut powdery mildew is a common plant disease in the growth of walnuts. What are the symptoms of walnut powdery mildew? How to prevent walnut powdery mildew?
Walnut powdery mildew symptoms:
Walnut powdery mildew occurs mainly in the leaves in spring and autumn. From the beginning, it forms a blocky green and irregular shape on the leaf surface. Later, the gray-white mycelium layer and the powdery-shaped branching bun are produced in the back of the lesion. In autumn, it is yellowish white in the grayish white silk layer, followed by the trade brown, and finally dark brown.
Small intestinal granules, that is, closed capsules of pathogens. When the young shoots and grades are seriously damaged, they cannot stretch and curl. Finally they die. On the mulberry leaves, the white powdery round lesions scattered on the back of the mulberry leaves gradually enlarge and form a piece. When severely covered, the surface of the leaves becomes yellowish brown, and the size range and leaves The back lesions are the same.
In the late stage, the center of the lesion is densely yellow with a black granule, which is the closed capsule of the pathogen. It happens more in the late autumn.
Characteristics of walnut powdery mildew:
The pathogens overwintered on the fallen leaves in the closed clams. In the second year, they were placed in a robes, and the vulgar air was transmitted for the first time. After the onset of spring, the meristematic vesicles are produced and re-infected by wind and rain. The disease continues to spread and expand, forming a closed capsule in autumn.
Walnut powdery mildew prevention and treatment methods:
What about walnut powdery mildew? What are the prevention measures?
1. At the end of autumn, the diseased leaves and diseased branches are removed and destroyed.
2. Strengthen management, rational irrigation and fertilization, control the amount of nitrogen fertilizer, and enhance tree resistance.
3, spray germination before Bamei 1 degree stone sulfur mixture to reduce the source of bacteria. In the early stage of the disease, spray 50% chlorhexidine (benomyl) wettable powder 800 times solution or 20% triadimefon emulsifiable concentrate 1000 times solution, 20% triazolone sulfur suspension agent 1000 times solution, 12.5% ​​nitrile emulsifiable concentrate or 30 % Teflon WP must be 3000 times solution.
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