What should I do if the potato is dead? How to prevent potato early death

Potato is a common vegetable. In the process of potato growth, there may be a disease called early death. Many friends who grow potatoes are not very aware of the early death of the potato. Let Xiaobian briefly introduce the early death of the potato and Prevention method.

What is the early death of the potato?

Potato early death is also known as potato verticillium or early maturing disease. At the beginning of the disease, the tip of the leaf turns yellow along the leaf edge, yellowing from the vein to the inside, and then from yellow to brown, but not curled until all the leaves are dead and do not fall off. The initial symptoms of rhizome infection were not obvious. When the leaves were yellowed, the vascular bundles at the rhizome were browned, and the vascular bundles of the stems on the ground became brown. Tuber infection begins in the umbilicus, and the vascular bundle becomes light brown to brown. The longitudinally cut diseased potato can be seen as a "eight" semi-circular color changing ring.

The pathogen Verticilliumdahliae Kleb. is called Verticillium dahliae, belonging to the subfamily Fungus. The hyphae are colorless, brown after maturity, separated and branched, and the size is 25-215×21-69 (μm). The base of the conidiophore is always transparent. The spore stalk has 2-4 branchlets per round, the size is 13.7-21.4×2.3-2.7 (μm), and one or more conidia are topped on each branch. The conidia are long and ovoid, the unit cell is colorless, and the size is 2.3-9.1×1.5-3.0 (μm), which can form micro-sclerotia.

Potato early death and transmission path

The disease is a typical soil vascular bundle wilt disease, the bacteria in the soil, the micro-sclerotia on the sick straw and the wintering of the potato, the potato planted in the next year caused the disease, the bacteria spread in the body, breeding in the vascular bundle And extended to the foliage, the disease is no longer repeated in the same year. The pathogen development temperature is 19-24 ° C, the highest is 30 ° C, the lowest is 5 ° C, and the hyphae and sclerotia 60 ° C are killed in 10 minutes. Generally, the temperature is low, and the seed potato block has a slow wound healing, which is beneficial to the invasion of the bacteria from the wound. From sowing to flowering, the average daily temperature is lower than 15 ° C, the duration is long, the incidence is early and heavy, and the climate is warm, the rain is reconciled, and the disease is obviously reduced; The terrain is low, the application of unfertilized organic fertilizer, improper irrigation and continuous cropping. It has also been reported that V.albo-atruReinkeet Berthold can also cause the disease.

Potato early death prevention and treatment method

(1) Breeding resistant varieties such as Alfie, Dising, Spart, Berek and other varieties are more resistant to disease.

(2) Apply compost or fully decomposed organic fertilizer.

(3) The seed potato was soaked for 1 hour with 0.2% 50% carbendazim wettable powder before sowing.

(4) Rotation with non-solanaceae crops for more than 4 years.

(5) Areas or fields with heavy disease, disinfection of soil with 50% carbendazim 2kg per 667m2; spraying 50% carbendazim WP 600-700 times solution or 50% benomyl WP 1000 at the beginning of the disease Double liquid, in addition, can be watered with 50% succinated copper WP WP 350 times, each plant is incubated with 0.51 or 12.5% ​​synergistic carbendazim solvable 200-300 times solution, each plant is watered 100ml. Once every 10 days, fill once or twice.