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细菌在土壤中的细菌和腹部壳，或种子越冬。 The following year, the seeds were bacterial and they were directly infected after germination. Spores fly out of the soil, spread through wind and rain, penetrate the epidermis and directly invade the seedlings. Old tissues or fruits are mostly invaded by wounds, and invade by stomata on pumpkin fruits. The bacteria overwinter on soil or diseased remains by mycelium, sclerosus or thick tummy spores. The bacteria during the seedling stage can invade from the wounds at the roots or directly from the apical cells of the root hairs.当种子在根和茎上的实质组织中发芽，再现和扩散时，附着在种子上的细菌可以直接从年轻的根部侵袭，然后进入木质部和血管束，上下膨胀。 Fusarium blocks the catheter and produces toxins to cause cells to die, and seedlings or adults wither.当温度在20-25摄氏度之间容易或严重的疾病，相对湿度高于85，土壤湿度高，高温和雨天，过度种植，通风不良，连续的种植，休赛期耕作等。近年来，这种疾病显示出趋势的增加。

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