Abstract: To elucidate the effect of sowing and transplanting date on the occurrence of locally-overwintering insect pests and disease in Yangtze Delta Rice Production Region, two-year field experiments in transplanted rice fields with 4 sowing-transplanting dates and directly-sown fields with 3 sowing dates were carried out, and the densities of the striped stem borer Chilo suppressalis, the small brown planthopper Laodelphax striatellus and the sheath blight Rhizoctonia solani (Thanatephoris cucumeris) were monitored regularly. The results showed that with the postponing of the sowing/transplanting, the occurrence and injury of these pests on rice significantly decreased in general. Therefore, the sowing date of transplanting rice and directly-sown rice was proposed as late May and early June respectively, as one of the effective management actions, which can avoid the severe occurrence of insect pests and incidences of the sheath blight．

Key words: rice, sowing/transplanting date, Chilo suppressalis, Laodelphax striatellus, Rhizoctonia solani(Thanatephoris cucumeris), occurrence