Tattoo Machine Kit,Tattoo Machine Set,Prosfessional Tattoo Machine Jinmei Makeup Machine Co., Ltd. , http://www.nstattooink.com
Experts say this may be sweet potatoes suffering from stem nematode disease. The disease is a key quarantine target for sweet potato in China, and it is a major disease in China's potato area. Its symptoms and prevention methods are as follows: First, the symptoms of plant growth after nematode infection slow, stem vine darkened; potato block after the appearance of the color is dark gray, sometimes longitudinal cracking or cracking, anatomical internal, black and white potatoes Between the white and black sponges, the pulp is completely destroyed and loses its edible properties. Second, control methods: (A) selection of disease-resistant seedless, disease-free seedlings, in the introduction of the process of strict quarantine, control of disease transmission. (2) The rotation of sweet potato and cereal crops for more than 4 years shall be carried out, and the sweet potato in the land plot with a history of nematocidal diseases within 4 years shall not be selected. (3) Clean the field and eliminate the nematodes carrying substances such as sick bodies. (d) Control of chemical agents. Use 0.25-0.35 kg of 50% phoxim EC, apply it to the hole before planting and then bury it with water. Each acre can also be used 1.5 to 2 kg of grams of phosphorus particles mixed with fine sand 25 to 30 kg into the hole, and then transplanting watering.