Downy mildew is the most important disease of litchi. How to control Downy mildew of litchi

Litchi downy mildew is the most serious disease of litchi. It damages leaves, spikes, fruiting twigs, fruit stalks and young fruits of litchi, especially the near-mature and mature litchi. This disease can cause a large number of litchi fruit drop, rotten fruit. The loss rate can reach 30% to 80%.

Litchi downy mildew

The control of litchi downy mildew is based on agricultural control and chemical control, as follows:

1. Strengthen the management of litchi orchard. Deep ploughing, application of organic fertilizer, improvement of soil structure and repair of furrows in order to facilitate drainage, improve environment, reduce humidity and improve the disease resistance of litchi plants. At the same time, do a good job in the pruning and pruning of litchi trees, thoroughly cut off the branches of diseases and insect pests and overdense branches, make the crown ventilated and transparent, and reduce the source of diseases and insect pests.

2. Clean the orchard and reduce the primary infection source of litchi downy mildew. After fruit picking, combined with pruning, remove the withered branches and shade branches from the trees, and burn the fallen leaves and fruits on the ground.

3. Chemical control: spraying control at flower bud stage, young fruit stage and mature stage of litchi. The spraying times were determined according to the weather (especially rain) and the development of litchi downy mildew disease. In case of continuous rain, clear spray should be taken. The mature stage of litchi is the most susceptible period. It is necessary to pay close attention to the weather and spray protection. There are many agents to control litchi downy blight, but they are easy to form drug resistance, so they are used alternately. The available medicaments are 64% alum M8 500 times 600 times liquid, 58% Manganese zinc wettable powder 800 times liquid, 25% Ruidu Manganese zinc wettable powder 800 times liquid, 90% aluminum ethyl phosphate (bengshuangling) powder 500 times liquid, 40% aluminum ethyl phosphate (bengshuangling) wettable powder 250 times 300 times liquid, 53% gold ray domino water dispersible granules 600-700 times liquid.