山东稻区褐飞虱的发生规律及预测研究

STUDIES ON OCCURRENCE REGULARITY AND FORECAST OF BROWN PLANTHOPPER, NILAPARV ATALUGENS(STAL),IN SHANDONG RICE PLANTING DISTRICTS

褐飞虱在山东稻区一年发生３－４代，当地不能越冬，第二代是主要为害世代，发生在８月下旬至９月中旬。将影响发生的因子如虫源，降水量、气温等输入微机，筛选出的预报因子，用模糊列联表方法建立的预报矩阵，经１９９４年应用，准确率为１００％。

Rice brown planthopper,Nilaparvata lugens(Stal),occurs 3-4 generationsannually and can not overwinter in the rice planting districts of Shangdon Province. Thesecond generation usually occurs between the last ten days of August to the second ten daysof September and causes serious injury,Based on the influencing factors, such as source ofbrown planthopper,rainfall,temperature,ect.screened with computer and the method offuzzy contingeney table,the forecasting matrix was established and the accuracy rate inpractical forecasting reached 100%in 1994.