Grape pods, also known as grape rust, are more serious in local areas.
Injury? Grape vines are mainly damaged on the back of the leaves. In the early stage, many irregular white patches were produced on the back of the leaves, and a thick layer of felt-like white hairs gradually appeared. After that, the tea changed from brown to dark brown. The victim's lobe is recessed and frontally raised, forming irregular spots of varying sizes. In severe cases, the leaves are uneven. The vines become swollen and tumorous and the epidermis bursts.
Morphological characteristics Female adult carcass length 0.1 ~ 0.3 mm, white. The conical shape resembles a carrot, and there are more than 80 rings in the dense. There are two pairs of feet near the head, and one slender bristles on each side of the abdomen. Male body slightly more oval oval, pale yellow. If the cockroach is similar to the cocoon, the small-sized grape cocoon occurs in multiple generations a year, and the cocoon clusters in the villus at the bud scale or in the skin of the dendrite. The next year the buds start to invade when they become swollen. After the leaves are spread, they climb up to the back of the leaves and suck their sap and lay eggs to breed. In severe cases, young shoots, tendrils, and spikes can all suffer. Hi on young leaves. In June and July, the victims were the heaviest. After September, they sneaked into buds for winter.
Control methods
1, early spring bud spraying period, the stone sulfur agent Baume 4 ~ 5 degrees, or crystal lime sulfur 30 times.
2. After spraying, the grape spout is sprayed with lime sulfur 0.3 to 0.5 degrees, or 50% sulfur suspension and crystal lime sulfur 300 times.
3. When seedlings or cuttings are introduced into the areas where they occur, they shall be soaked with the sprayed liquid before germination and then planted.
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