耕起によるヒメトビウンカ越冬虫の防除効果

抄録

We investigated the effect of ploughing on overwintering populations of Laodelphax striatellus nymphs in two successive periods. The population densities of L. striatellus were remarkably lower after ploughing. Almost identical results were recorded irrespective of the ploughing seasons (November or January). In addition, the population densities remained low until early spring when the examinations ended.