Identification and control of sweet potato stem nematode disease

Sweet potato stem nematode disease is also called hollow disease, deaf heart disease, sweet potato that is susceptible to disease. The potato vines are stunted and dwarf, and sometimes the epidermis cracks and forms irregular brown spots. When it is severe, it is dry and the whole plant dies. The inner part of the diseased tuber became black and dry, and the heart of the tuber became black. The epidermis showed black haloes or cracks. The tuber also had the same outer skin as the good one. The stem nematode of sweet potato is caused by the nematode. The nematode penetrates the root tissue of sweet potato with a needle, drills inside the potato block, feeds on nutrition, and forms a grayish-white brown hole in the potato tissue. The incidence of light sweet potato stem nematode disease was reduced by 20%-30%, and severe cases reduced production by more than 50% or even yielded. Sweet potato root-knot nematode disease is also known as mantle disease and sweet potato root-knot nematode disease. The diseased plants showed stagnant growth, internode shortening, leaf yellowing, underground root tubercle, and epidermis with cracks. The fine roots had granular (similar to nodule-like) gall infestation, and the plants died severely. Sweet potato root knot nematode disease is also caused by nematode damage. Tubers, seedlings and soil with insects can all be infected. Control methods: Eradicate pest sources: Concentrate destruction of pathogens during nursery, planting, and harvesting. Selection of disease-resistant varieties and disease-free seed potatoes, seed potatoes can be used to soak in 51 ~ 54 °C warm soup, seedbed with pure soil to cultivate disease-free strong seedlings. Ingredient soaked in potato seedlings: soaked for 10 minutes with 100% solution of 50% phoxim EC. When the transplanting of potato seedlings is carried out with phoxim microcapsules or triazophos microcapsules, 5x solution of phoxim microcapsules can also be used. The bottom of the roots is 6-10 cm, soaked for 5 to 10 minutes to treat the seedlings. Prevention.

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