First, leaf spot There are two kinds of leaf spot and black spot in peanut leaf spot, both of which often occur in the same plant or even the same leaf, usually in the flowering period and in the middle and late stages. At the beginning of the brown spot, the leaves were gloomy gray dots, and then expanded to brown to dark brown irregular circles, surrounded by a clear yellow halo. In the early stages of black spot disease, small spots of rust were brown, and then expanded to black or dark brown lesions with black mold on the lesions. Control methods: In the initial stage of disease, use 50% carbendazim 1000 times or 70% thiophanate-methyl 1000-1500 times foliar spray, spray once every 7-10 days, and spray 2-3 times in total. Foliar spray fertilizer combined. Second, stalk rot, root rot Stalk rot disease at seedling stage, in the base of the stem to produce water-stained yellow-brown spots, after dark brown, severe plant wilting withered; adult disease, the main stem and collateral base production Water stains yellow-brown spots, the development of lesions will make the stem base black and dead. Root rot mainly damages the roots. After the onset of disease, the plants are short and yellow, temporarily wilt and even wither. The main roots turn brown, and there are no lateral or less lateral roots. They are "rat-tailed." Control methods: Use 50% carbendazim to seed 0.3% of the seed amount; use the carbendazim 600-800 times solution to spray the peanut base 1-2 times at the beginning of the disease; seriously block, rotate for 2-3 years. Third, earthworms usually hatch in early July to mid-season and begin to harm fruit and young fruit. In late June to mid-July, combine groundnuts before peanuts are ridged and covered with soil. Use 250-300 ml of Loess per acre and add 25 kilograms of dry sand to mix with peanuts to spread the roots. Then ground the soil. Watering, or use Beauveria bassiana insecticide 1-1.5 kilograms or 50% phoxim 0.3-0.4 kilograms, water irrigated or combined with water with water (drops) pouring. Fourth, the new black spider mites commonly known as "steel coccidia", larvae body length 1 mm, drilled into the root bark, sucking juice, and gradually developed into a spherical bead (about a few millimeters in diameter), born in the peanut root, resulting in plant dwarf Leaves yellow and died when severe. It can be controlled from late June to early July (high egg hatching period), and imidacloprid, phoxim, and pro-cone can be used to spray peanut stem base and soil surface. 7-10 days, spray 2-3 times. Tetanus Shot,Tetanus Vaccine,Hepatitis B Injection,Hep B Vaccine FOSHAN PHARMA CO., LTD. , https://www.fospharma.com
How to Prevent Peanut Disease and Insect Pests