What medicine is used for tobacco bacterial wilt

Tobacco bacterial wilt (Ralstonia solanacearum) is one of the main diseases of tobacco in tropical and subtropical regions, which occurs in Shandong, Henan, Shaanxi and Liaoning provinces. What kind of medicine is used for tobacco bacterial wilt? What are the symptoms?

What medicine does tobacco bacterial wilt use?

At present, there is no medicine to treat tobacco bacterial wilt, we can only prevent it in advance. Before planting, 2-2.5kg per mu, or 50% phoxim granules, 2-3kg per mu, were applied in holes or ditches; after planting tobacco, 4000 times of agricultural streptomycin, 77% of WP and 50%DT WP were used alternately and irrigated once every 7-10 days for 2-3 times.

What are the symptoms of tobacco bacterial wilt?

1. Bacterial wilt is a vascular bundle disease. As soon as the disease withered, the wilted leaves have not faded at the initial stage, and still remain gray-green, so it is called bacterial wilt.

The appearance of the stem of the diseased plant shows longitudinal black stripes, which can be extended to the tip of the plant. Sometimes one side of the diseased plant is the first to wither, and the corresponding side of the root becomes black and rotten, which is called "half crazy". In serious cases, a large area of water-like dead spots will appear on the leaves. In the middle and later stage of the disease, all the leaves withered. Dissection of the diseased plant stem showed that the vascular bundle turned brown, the part with high water content was squeezed by hand, and the yellow juice was oozed from the catheter, that is, bacterial pus. In the later stage, the pith of the diseased stem was honeycomb or all rotted into a cavity.

two。 Pathogenic bacteria can survive the winter mainly in the soil and on the diseased remains left in the soil, as well as in seeds or other hosts. Bacteria spread mainly through the flow of irrigation water, the feeding of underground pests, bacteria-carrying fertilizers and bacteria-carrying production tools. The main ways of bacteria invasion are wounds, such as insect injuries, mechanical injuries, burns and so on.

In addition to using pesticides to control tobacco bacterial wilt, it is also necessary to select disease-resistant varieties, clear the garden, rotation and so on.