Pierce disease in grape and its prevention techniques

Grape Pierce disease seriously harms the American species and European and Asian grape species. Apart from harming grapes, the disease can also infect other 28 families of plants.

1) symptoms. The disease mainly damages the leaves of plants, and it can also harm the stems and roots. After the infected grape vines are infected, they die faster and it is difficult to survive for a growing season. Older plants can still survive for a longer period of time.

1 leaf symptom. In the mid-growth period of the grapes, localized burns occur along the veins or edges of the leaves, and the diseased areas gradually turn brown and burnt. The edges of the diseased areas are yellow or reddish. The size of the burned area in the leaves varies greatly. Some are small broken points, while others can occupy half of the foliage. The burn area is banded and extends from the leaf margin to the petiole. When the disease begins to occur, the diseased leaves only appear on one branch and continue to develop. The diseased leaves can appear on other branches. After the diseased leaves showed symptoms, the fruits on the shoots stopped growing and gradually withered and died. If the symptoms appear later, the fruit can be colored in advance, but it is not really mature. In the early fall, the diseased leaves fall off and only the petiole remains on the branches.

2 branches symptoms. The maturity of diseased shoots is inconsistent. The skin color of mature shoots turns brown, and the immature ones are green. On the same shoots, green and brown can appear. Branches in the green part are prone to frost damage in the winter.

3 root symptoms. The roots of the diseased plants grew normally at the beginning of the disease, but when the disease was severe, the roots died and the roots and stems also died.

2) Control methods.

1 strict quarantine. It is forbidden to introduce seedlings and cuttings from the affected area. If it has been introduced, it should be isolated and planted for two years. If it is confirmed to be disease-free, it can be cultivated, otherwise it will be destroyed on the spot.

2 spray. Spraying insecticides during the growing season to kill diseased insects can prevent the spreading of the disease, but it must be noted that insecticide must be thorough.

3 Clear field strains to prevent further spread of disease.

4 Remove weeds in the field, reduce the number of disease-infecting hosts and winter-borne diseased insects, and prevent disease epidemics.

5 Cultivate disease-resistant varieties. In diseased areas, the selection of disease-resistant varieties can receive good control effects.

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