Causes of death of Chinese yam and its control methods

In the process of yam planting, dead plant is a common phenomenon, especially in continuous cropping land, the phenomenon of dead tree is particularly serious, which brings serious economic losses to growers. So what is the cause of the death of yam? How to prevent and cure it? Let's get to know it with the editor.

1. Brown spot

The disease mainly harms leaves and stems, the disease spot on the leaf is round or oval, the middle gray-white to dark gray edge is dark brown, in the later stage, there will be small black spots in the disease part, the stem spot is gray-white in the middle, and the irregular black spots are surrounded by black spots. Color disease spots will cause the whole plant to blacken and die. For the prevention and control of brown spot, 70% thiophanate methyl 1000-fold solution or 80% allicin 3000-fold solution can be used to prevent and cure brown spot, and the effect is better.

2. Fusarium wilt

In the early stage of the disease, the main manifestation of this disease is fusiform brown disease spot at the base of the stem, which leads to the decay of the epidermis at the base of the stem, the yellowing and shedding of the upper leaves, the withering and death of the vines, and the browning inside the diseased stem. root infection will cause round branch irregular brown disease spots around the lenticels, and it is best to wither and die. For blight, farmers can irrigate the roots with 1000 times of 50% chlorobromoisocyanuric acid or 40% methyl thiophanate sulfur suspension or 70% mancozeb.

3. Brown rot

Change the tuber which mainly harms the yam, after the tuber is infected, the diseased part will show rotten irregular brown spots, slightly sunken, the discoloration of the diseased part can be seen after incision, and in serious cases, all around the diseased part. For vegetable farmers, 70% thiophanate methyl 1000 times solution or 80% allicin 3000 times solution can be used for root irrigation control, once every 7-10 days, 2-3 times in a row, thoroughly control.

The above is the introduction of the causes and prevention and control methods of yam, hope to help you, want to know more related knowledge, please pay attention to us.