Control of soybean dodder

Dodder is also known as yellow rattan and tangled rice seedlings. It's a malignant weed. It harms a variety of crops and can cause the loss of soybean production, which is common in all parts of the country. (1) Morphology: the stem of soybean cocoon silk is yellow, orange-yellow or yellowish green, smooth, glabrous, linear, winding to the left on the host stem. Leaf blade reduced to membranous scales. The flowers are yellow and white, mostly clustered together, in the shape of a hydrangea. Seeds globose, yellowish brown or dark brown, surface rough. One dodder can parasitize more than 300 soybean plants and produce more than 1 million seeds in one season. (2) Prevention and cure method: ① agricultural prevention and cure. Select seeds to prevent soybean seeds from carrying cocoon silk seeds; rotation can rotate with ground claws, millet, corn and sorghum for 2 or 3 years. ② biological control. Lubao No. 1 bacterial agent can be used for control. The use of bacterial agent is early. When Fan Gongzi wound around 2 Mel 3 soybeans, he sprayed a wave of 40 million live spores per milliliter. When spraying, it should be evenly stained with bacterial liquid, and breaking the dodder vine with a stick before spraying can improve the control effect. Chemical control of ③. When the wide filaments are entangled and begin to transform, spray with 10% glyphosate emulsion 400 × 500 times or 48% desloromide EC 100 times.