Role of small-scale fishing in Kompong Thom Province, Cambodia

ABSTRACT:   Household surveys of small-scale fishing were conducted in Svay Ear and Srey Rangit villages in Kompong Thom Province, Cambodia. Data were collected from 104 of 183 households and 105 of 140 households in Svay Ear and Srey Rangit, respectively. In both villages, almost all households conducted rice cultivation and approximately 75% of them also conducted fishing. Three fishing groups: (i) inside lake; (ii) around lake; and (iii) around village were observed in both villages, according to their main fishing grounds. The inside lake group conduct fishing only in Tonle Sap Lake which is located 30 km away from the villages. The around lake group fish in lakes, marshes and flooded forests adjacent to Tonle Sap Lake, which are more than 5 km from the villages. The around village group collects fish from rice fields and ponds located inside the villages and also in some streams, rivers and lakes adjacent to the villages. The distance to the fishing grounds is less than 5 km from the villages. Most fishing groups were the inside and around lake groups, which occupied 76.0 and 65.7% of Svay Ear and Srey Rangit, respectively. These two groups produced 80.6 and 69.7% of the respective village annual total fish catches. These two groups sold a large portion of their fish catches. Although previous reports indicated that small-scale fishing is for subsistence, present results indicated that small-scale fishing was commercially conducted and fishing was important as an income source.     

天水地区小麦白粉病菌致病类群初步测定

1987～1989年,对甘肃天水地区的小麦白粉病菌致病类群,用鉴别寄主品种进行了室内测定和田间自然感染监测。结果表明,有11个致病类群,三年结果基本一致,没有明显变化。优势类群(015,011)的频率在48.1％～67.9％,它们是弱致病类群,但对生产上的品种,大部分能侵染。供试的菌样对鉴别寄主品种的毒性频率为:阿夫,100％;Ulka×Cc8(Pm2),22.4％;Era,55％,高加索(Pm8),100％;CI12633(Pm2+Pm6),14.3％;Maris Huntsman (Pm2+Pm6),14.3％;肯贵阿,2.5％;白免3号(Pm2x),12.3％;新疆小白冬麦,0.0％。另外,对洛夫林10的毒性频率100％,对Khapli(Pm4等)免疫。