How to Control Grape Leafroll Disease

Grape leafroll disease is a common disease in grape production, which is widely spread. Grape leafroll disease has semi-latent characteristics. It does not show symptoms in most growing seasons.

Most Eurasian plants show symptoms only at the fruit ripening stage. Leaf symptoms were most obvious from the harvest to the deciduous stage. Leaf margins were rolled back, veins became yellow or red, only the main veins remained green, while some varieties gradually withered and browned. The disease is harmful and can reduce grape yield by 20%-50%.

Grape leafroll diseases

The symptoms of grape leafroll disease vary with environmental conditions and time. The symptoms of grape leafroll disease vary according to environmental conditions and at different times of the year.

Transmission pathway: Grape leafroll virus is mainly transmitted through seedlings, scions, and cuttings.

Grape leafroll disease symptom

Causes of Grape Leafroll Disease

Artificial cultivation activities mainly transmit grape leafroll disease. It can be transmitted by using cuttings or buds and rootstocks of diseased plants as asexual reproductive materials. Most rootstocks are cryptogenic and virulent, so the risk of disease transmission through rhizomes is high. Dodder can transmit the virus from diseased grapes to healthy grapes in the field. Juice inoculation can not spread from grapes to grapes, but it can be transmitted to herbal hosts through vines. GVA can be transmitted by a pink scale, but it is observed that the spread of leafroll disease is limited in the field.

The disease can be detected by some grape varieties as indicators, such as Lizhu, Mianjian, 6-18 months, and Pinot Noir for six months. The reaction is early red leaves.

Grape leafroll diseases

How to Control Grape Leafroll

(1) Agricultural Control

Breeding rootstocks with anti-virus diseases is the fundamental measure to prevent and control virus diseases. Quarantine and inspection should be strengthened, and virus-free mother plants should be selected to propagate seedlings.

(2) Potential Detoxification

The seedlings or test-tube seedlings were placed in a heat treatment box at 38 C for 56-90 days under artificial light. The new shoots were cut about 2-5 centimeters. The virus-free rate was 86%. The virus-free seedlings had to be tested for non-toxicity before they could be used as mother plants. However, the operational requirements of this treatment method are relatively high, and the cost is relatively high.

(3) Organic Prevent Solution

Applying chitosan oligosaccharide, by activating a plant’s immune system, can maximize the plant’s resistance ability to virus, fungus, and bacteria. And the control efficiency is about 70%-80%。

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