Control of two main diseases of soybean

Soybean gray spot, also known as spot disease, pods began to occur from the tender pod stage, grain filling stage is the peak period of the disease, from July to August with high temperature and heavy rain. It mainly harms the leaves. When the disease is serious, almost all the leaves are covered with disease spots, causing the leaves to fall off prematurely, the soybean quality is reduced, and the yield is reduced by 20% to 30%. This year, the high-temperature and rainy climatic conditions in many places in our province are very conducive to the occurrence of the disease. The author reminds soybean farmers not to ignore the prevention and control of soybean gray spot.

Chemical control: in the soybean flower and pod period, spray with 50% carbendazim per mu or 800 kg / mu, or spray 30 kg of water with 20 grams of 5% hexazolol suspension, or spray 30 kg of water with 20 grams of Baozhida (18% imipramine oleic acid copper EC).

Soybean Sclerotinia sclerotiorum mainly infected the stem, which began to occur in late July. At the initial stage of infection, there were brown spots on the stem, and then there were white cotton-like mycelia and white particles, and finally turned black particles. In the longitudinal section of the stem of the diseased plant, the black cylindrical mouse fecal sclerotia could be seen, and the diseased plant was grayish white after death.

Chemical control: spray with 1000 times of 50% sulfamethoxazole wettable powder, or 1000 times of 50% Sclerotinol, or 50% methyl topiramate.