作者在多年选育推广抗棉花枯萎病品种86-1号过程中,在棉花枯萎病重病田或病圃都观察到,连续种植抗病品种多年后,再种植感病品种则发病率显著降低(称病圃衰退)。我们还观察到,在衰退后的病圃土壤内接入大量致病力强的枯萎病菌后,再种植感病品种,发病率仍无显著提高。 In the course of selecting and popularizing cotton blast resistance cultivar 86-1 for many years, the authors observed that in the severe cotton blight disease or nursery, the incidence of re-cultivation of susceptible varieties was significantly reduced after many years of continuous cultivation of resistant varieties Said the nursery recession). We also observed that there was still no significant increase in the incidence of re-planting susceptible varieties after the accession to a large number of pathogenic Fusarium wilt bacteria in the soil after the recession.