Control methods of Diseases and insect pests of planting Chinese Yam

Chinese yam is very resistant to disease and rarely gets sick, but anthracnose sometimes occurs in recent years, resulting in withered stems and fallen leaves. Generally, before sowing the seeds, soak the seeds with 1000-1200 times of carbendazim wettable powder, or dip the wound of the yam plant in the hay ash, or store the yam plant, joke or surplus in the plant ash. Seedling disease can be sprayed with 50% carbendazim or mancozeb 800 times, once in 7-10 days, 5-6 times.

The pests of Chinese yam are very serious, mainly underground pests, such as golden needle worms, mole crickets, grubs, drill many holes in the yam underground tubers, and sometimes hide dormant in the tubers. Golden needle worm itself has a layer of membrane, the drug is not easy to penetrate its body contact, stomach poison is better. It is best to take comprehensive measures to prevent it, as follows:

(1) turn the land 25-30 cm deep before winter, turning the overwintering adults and larvae to the surface, causing them to freeze to death, sun to death or be preyed on by natural enemies.

(2) fertilizing mature organic fertilizer can change the aeration and permeability of soil, make crops grow healthily, and enhance disease resistance and insect resistance. Crop rotation is also a powerful measure to prevent disease and insect pests, and it is generally better to rotate every 3-4 years.

(3) the poison valley is made of 0.15 kg 90% trichlorfon 30 times liquid, mixed with blighted grain, 1.5-2.5 kg per 667 square meters. Sprinkle it on the surface of the soil and loosen the topsoil with a hoe so that some medicine is in the soil and some is on the soil surface.

(4) poison erbium 0.15 kg 90% trichlorfon 30 times liquid, mixed with fried wheat bran or bean cake (or cottonseed cake) 5 kg to make poison erbium, the effect is good in the windless and muggy evening, 1-1.5 times the weight of erbium should be added when mixing. Or use 40% 50% dimethoate 100 grams mixed with 5 kg of water to stir-fry 50 kg of erbium materials (wheat bran, bean cake, corn crumbs, etc.), planing every 2 meters, every 3-4 meters planing a large hole, put a pinch of poisonous erbium and then cover the soil, 1.5-2.0 kg of poisonous erbium every 667 square meters. This method is very good for the control of mole cricket and grubs.

(5) 1500 times of 40% methyl isophosphates EC was used for root irrigation, and 0.15kg to 0.2kg per plant. Or use 2% methyl isosinophos powder, 3-4 kg per 667 cubic meters, sprinkle on the near-plant topsoil, and then mix the soil and powder well with a hoe. This method has a special effect on the control of grubs and golden needle worms. Or use 90% trichlorfon 800 times solution, 0.15-0.2 kg per plant.