河北省地方水（陆）稻品种抗病虫性研究

对河北省地方水、陆品种抗两病两虫性进行了鉴定，并在此基础上分析了抗稻瘟病、抗白叶枯、抗褐稻虱、抗白背飞虱品种的分布情况。对抗性频度较高的抗稻瘟病性、抗白叶枯病性从水、陆稻，熟期，不同稻作区等方面作了详细研究。结果表明：抗稻瘟病、白叶枯病品种频度高，分别为45.86%和50.34%，高抗率仅为0.75%和2.05%，抗率分别为24.81%和15.75%；抗褐稻虱、白背飞虱品种频度很低，分别为4.51%和3.34%，高抗褐稻虱品种2个，无抗至高抗白背飞虱品种。抗稻瘟病、白叶枯种质频度和强度均是陆稻高于水稻。纬度、海拔高，气候寒冷的张家口、承德两市稻瘟病抗性强度低；唐山、秦皇岛两市抗性强度高；冀南零星种植亚区抗性强度最高。抗白叶枯病种质分布规律是随着纬度的增加，温热条件的降低呈递减趋势。

Study on Reisstance to Disease and Insect Pests of Lowland and Upland Rice Varieties in Hebei Province

The distribution of lowland and upland rice varieties in Hebei Province resistance to blast (Pyricularia oryzae),bacterial leaf blight (Xanthomonas oryzae), brown planthopper (Nilaparvata lugens), and white-backed planthopper (Sogatella Jurcifera) was analysed on the basis of the identification results, and the detailed study on resistance to blast and bacterial leaf blight was conducted in lowland and upland rice, maturity, rice growing region etc. The result showed that the frequency of resistant varieties to blast and bacterial leaf blight was high , 45.86% and 50.34% respectively, the high resistant rate was only 0.75% and 2.05%, and the resistant rate was 24.80% and 15.75% respectively. The frequency of resistant varieties to brown and white-backed planthopper was low, 4.50% and 3.34% respectively, 2 varieties showed high resistance to brown planthopper , no varieties showed resistance and high resistance to white-backed planthopper. The frequency and strength of resistance to bacterial leaf blight in upland rice were higher than that in lowland rice .The resistant strength to blast was low in Zhangjiakou and Chengde city where the latitude and levation were high with cold climate, high in Tangshan and Qinhuangdao city, the highest in Southern Hebei odd growing sub-region, The distribution of germplasm resistance to bacterial leaf blight showed decrease succesively with the increase of latitude and decrease of tempreture.