豫南稻区紫云英不同喷药时期“一喷三防”效果研究

Control Effect of"One Spray and Three Prevention"on Chinese Milk Vetch at Different Spraying Periods in Southern Henan Rice Area

为了探求豫南稻区紫云英留种田块植株生长中后期的最佳喷药时间,设置3个喷药时期(现蕾期、初花期、盛花期)进行紫云英“一喷三防”作业,研究不同喷药时期对紫云英病虫害的防治效果和紫云英种子产量及其构成因素的影响。结果表明,在紫云英生长中后期进行“一喷三防”作业,均能显著降低紫云英的被害株率和叶片发病率,显著提高紫云英单位面积荚数、单荚籽粒数和千粒重,进而显著提高紫云英种子产量。其中,以初花期进行“一喷三防”作业的效果最好,适宜在豫南稻区紫云英种子生产实践中推广应用。

In order to explore the optimal spraying time in the middle and late growth period of Chinese milk vetch in the seeds field in southern Henan Province rice area,three spraying periods(bud stage,initial flowering stage and full flowering stage)were set to carry out the"one spray and three prevention"operation,and the control effect of different spraying periods on the diseases and pests of Chinese milk vetch and the influence of seed yield and component factors of Chinese milk vetch were studied.The results showed that the"one spray and three prevention"operation in the middle and late growth period could significantly reduce the rate of damaged plants and the incidence rate of leaves,significantly increase the pod number per unit area,the seed number per pod and the 1000-grain weight,and then significantly increase the seed yield of Chinese milk vetch.Among them,the effect of"one spray and three prevention"operation at the initial flowering stage was the best,which was suitable for promoting and applying in the seed production of Chinese milk vetch in the southern Henan Province rice area.