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2024/3/4 15:04:19


Wheat crown rot is a soil-borne fungal disease that can also be spread by seeds. The pathogenic species are relatively complex, mainly including Fusarium pseudograminearum, Fusarium graminearum, Fusarium culmorum, Fusarium avenaceum, etc., with Fusarium pseudograminearum as the dominant pathogen.


The pathogens usually invade from the roots and stems of plants, which are directly related to the distribution of pathogens in different fields. In no-tillage plots, pathogens exist on the soil surface or ground, then infect in the base of the stem, if it has lots of wheat residue, the pathogens would invade from the rhizomes.


The main symptom of wheat crown rot is brown discolouration of stem bases. The 1~2 internodes of stem base become brown. In humid conditions, red mold can be seen on the stem node. In severe cases, the leaves wilt, and the grains are small with white spikes or even seedless.


Generally, there are two infection periods of wheat crown rot, wheat seedling stage and tillering stage before winter, and jointing stage after spring. The pathogen hosts mainly include wheat, barley, corn and other gramineous crops and weeds, and do not infect dicot crops. Years of continuous rotation cropping of wheat and corn, and the return of straw residues to the field year by year, led to the accumulation of pathogens in the soil. This is the main cause of the wheat crown rot outbreak and increasing severity of the disease. Drought and semi-arid climates, poor soil condition are conducive to the occurrence of the disease.


Seed treatment before sowing and fungicide when jointing stage have good effects on wheat crown rot. The field test results showed that seed treatment and spraying once when regreening stage, the control effect was significantly higher than only spraying once when regreening stage.


The combination of pre-sowing seed treatment and spraying during the regreening period is effective in controlling wheat crown rot. Seed dressing with Tebuconazole before sowing could reduce infection rate at seedling stage. And spraying Tebuconazole plus Prothioconazole, or Difenoconazole, or Thifuramide to the stem base during the jointing and regreening stage of wheat can protect the healthy plants from the infection of pathogens and yield reduction. For the fields with severe wheat crown rot for many years, replanting non-host plants is a better choice.


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