Symptoms are distributed in Henan and Shandong provinces. The disease began at the seedling stage and continued until adulthood. Infected at the seedling stage, the aboveground growth is slow or stagnant and gradually withers, similar to the root knot nematode disease, but the roots are not long rooted. Mainly manifested as browning of roots, less roots, smaller roots ranging in thickness, curved root tips, and some decayed, giving birth to 0.5mm white to brown or yellow small particles, that is, the female adults of pathogenic nematodes. Onset of light smoke, the late symptoms have eased, and the onset of weight has been in a state of fertility until death.

The pathogen Heterodera tabacum Lown et Lown called the tobacco cyst nematode, which is a parasitic plant nematode. Female nematodes are white pear-shaped, semi-parasitic, and oval in shape. They are hidden in the mother's body. Female adult worms become brown oocysts containing several hundred eggs after death, which is particularly strong in resistance. In addition to harming tobacco, the nematode also infects 45 species of solanaceous plants such as potatoes and eggplants.

Transmission routes and disease conditions The nematode sheds cysts in the soil for winter, and the eggs can survive for a long time in the cysts or in the soil. After encountering suitable host stimulation, the eggs begin to hatch into larvae, and the newly hatched larvae penetrate into the roots for feeding. After several times of molting, it became a pear-forming insect. In the tobacco field, it is spread mainly through tillage, manure, irrigation water or transplanted seedlings. The worms are susceptible to disease in the continuous cropping of tobacco fields or soils, and heavy droughts occur.

Prevention methods (1) Implement 3-4 year rotations with cereal crops, sweet potatoes, and cotton. (2) Applying compost or decomposed organic fertilizer made from enzyme bacteria, do not apply manure with nematodes. (3) Strengthen field management. Water the plants in time when the drought occurs, and remove the roots of the plants in time after harvest to concentrate them deeply or burn them. (4) D-D mix is ​​applied 10 days before transplanting and every 667m26kg or 6-8kg of 80% dichloroisopropyl ether EC is used to treat the soil 7 to 20 days before sowing; the tobacco plants can be outside the roots during growth. 15cm trench application, ditch depth l0-15cm. Can also be used 20% Prophos-P granules per 667m2 1.5kg or 10% Crophos granules per 667m2-4kg, 3% Carbofuran granules per 667m2 1.5-2.0kg, 10% Kedandan granules 667m2 1.5kg, 15% iron gram granules 667m2 1kg, applied before the transplant.

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