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Control Methods for Fusarium Root Rot in Soybean

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Symptoms: Fusarium root rot is one of the common root rots in soybean. It mainly occurs at the seedling stage. The roots and stem base of diseased plants develop elliptical brown, elongated to irregular sunken spots, which later expand into large patches encircling the main root, and some damage the lateral roots. The fungus mainly damages the cortex, causing diseased seedlings to emerge very slowly, cotyledons to lose green color, and lateral roots and fibrous roots to be few; in the later stage the roots turn black and the epidermis rots, the diseased plants turn yellow and become stunted, and the lower leaves drop early. The diseased plants generally do not die, but they set fewer pods and the seeds are small. Control methods should adopt comprehensive measures with prevention as the priority. (1) Select resistant

Symptoms: Fusarium root rot is one of the common root rots in soybean. It mainly occurs at the seedling stage. The roots and stem base of diseased plants develop elliptical brown, elongated to irregular sunken spots, which later expand into large patches encircling the main root, and some damage the lateral roots. The fungus mainly damages the cortex, causing diseased seedlings to emerge very slowly, cotyledons to lose green color, and lateral roots and fibrous roots to be few; in the later stage the roots turn black and the epidermis rots, the diseased plants turn yellow and become stunted, and the lower leaves drop early. The diseased plants generally do not die, but they set fewer pods and the seeds are small.

Control methods: Comprehensive control measures with prevention as the priority should be adopted. (1) Select resistant varieties, such as Heihe No. 3, Hongfeng No. 3, etc. (2) Sow early at the proper time, master the sowing depth, and implement the deep loosening tillage method; carry out rational crop rotation; use disease-free seeds, etc. (3) Treat seeds with 50% Shuangshuang seed dressing at 0.3% of the seed weight, which has a certain control effect. (4) For chemical control, see Phytophthora Root Rot of Soybean. (5) When necessary, spray Plant Power 2003 or Duode rare earth nutrient agent.

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