若干粳稻品种(系)抗褐稻虱特征评价

Some Resistance Indices of Selected Resistant Japonica Varieties to Rice Brown Planthopper

就一些粳稻抗性品种对褐稻虱(BPH)Nilaparvata lugens抗性进行了评价,水稻品种秀水48作感性品种对照。结果表明:1)褐稻虱在感性品种上分泌的蜜露面积显著地大于抗性品种;饲养在不同品种上褐稻虱一生产卵量(粒/(?)):秀水48为316.2,秀水620为191,嘉23为165.2,IR64为87.5;不同品种上褐稻虱若虫的存活率:秀水48为100％,秀水620为44％,嘉23为28.22％;相对取食量与抗性等级、田间累计虫量、若虫存活率及产卵量呈正相关。2)不同抗性品种上褐稻虱的种群增长率,秀水48为0.1221,秀水620为0.088,嘉23-2为0.083。3)供试品种上逻辑斯蒂模型的K值,秀水48为81.58,秀水620为30.54。4)本试验各品种对褐稻虱的内禀控制率(％),秀水48为0。秀水620为78.79,嘉23为84.94,IR64为0.8632。5)各品种对褐稻虱田间控制率(％),秀水48为0,秀水620为77.23,嘉23—2为76.68。

The resistance indices of japonica varieties resistant to the brown planthopper (BPH), Nilaparvata lugens, are described, The rice variety Xiushui 48 was used as susceptible control. The results indicate: 1) The area of honeydew excreted by BPH was apparently greater on susceptible than that on resistant varieties. The number of eggs oviposited in the life-span of BPH on different rice varieties were: 316.2/female on Xiushui 48; 191.0/female on Xiushui 620; 165.2/female on Jia 23 and 87.5/female on IR64. The survival rates of BPH on different rice varieties were: Xiushui 48, 100%; Xiushui 620, 44% and Jia 23, 28.22%. There exist positive relationship between relative intake amount of BPH (Area of honeydew excreted by BPH) and resistance grade of rice variety, cumulative insect-days per hill, surviv- al rate, oviposition amount of BPH. 2) The rates of population increase of/BPH on different resistant va- rieties were 0.1221 on Xiushui 48; 0.0880 on Xiushui 620 and 0.0830 on Jia 23-2.3) The K values of logistic models on the tested varieties were: Xiushui 48, 81.58 and Xiushui 620, 30.54.4) The intrinsic control rate in this experiment was Xiushui 48, 81.58% and Xiushui 620, 30.54.4) The intrinsic IR64, 86.32%, 5) The field control rates of several varieties to BPH were: Xiushui 48, 0%; Xiushui 620, 77.23% and Jia 23-2, 76.68%.