稻纵卷叶螟Cnaphalocrocis medinalis(Guenee)原为我国东南部稻区偶发性害虫,六十年代数量上升,七十年代经常大发生,成为水稻生产上的重要害虫。作为综合防治的一个环节,研究水稻品种对稻纵卷叶螟的抗性,筛选鉴定抗虫亲本材料,选育抗虫栽培品种是有现实意义的。Das(1974a)首先报道了稻纵卷叶螟在不同品种稻叶上取食量的差异,其后Das(1974b)、Velusamy(1975)、K.Saivaraj(1979)先后进行了抗稻纵卷叶螟品种的田间筛选。 作者从1977年开始这方面的研究,三年来鉴定了380个水稻品种的田间抗性。现将初步进展小结如下,以供参考。 材料与方法 一、供试水稻品种的来源 供试品种中将近一半是从国际水稻研究所引进的具有各种抗性基因的杂交后代,其余是从亚洲、欧洲、美洲引进的定型品种及湖南省推广的晚稻良种、地方品种。其产地的分布见表1。 二、鉴定方法 鉴定在湖南农学院农场进行。湖南省稻纵卷叶螟一般一年发生五代,以早稻上的第二代 Cnaphalocrocis medinalis (Guenee) was originally a sporadic pest in paddy rice in southeastern China. Its population increased in the 1960s and often occurred in the seventies, making it an important pest in rice production. As a comprehensive prevention and control of a part of the study of rice varieties of rice leaf roller resistance, screening and identification of insect-resistant parent material selection of insect-resistant cultivars is of practical significance. Das (1974a) first reported the difference in the feeding amount of rice leaf roller between different rice varieties. Das (1974b), Velusamy (1975) and K..Saivaraj (1979) Field selection of borer species. The author started his research in this field in 1977 and has identified the field resistance of 380 rice varieties in three years. The preliminary progress is summarized below, for reference. MATERIALS AND METHODS I. SOURCE OF THE TESTED RICE VARIETIES Nearly half of the tested cultivars were hybrid offspring with various resistance genes introduced from the International Rice Research Institute and the rest were the cultivars introduced from Asia, Europe and the Americas and Hunan Province Promote the late rice varieties, local varieties. The distribution of its origin in Table 1. Second, appraisal method identification in Hunan Agricultural College farm. Hunan Province, rice leafroller usually occur five generations a year to early rice on the second generation