论文部分内容阅读
大沙区位于北纬23°19′,东经112°40′,处于广东的西、北、绥三江下游围田地区。年平均温度21.3℃,常年降雨量1,800毫米。全区水稻面积6万亩,旱地8,000多亩,稻谷是主要粮食作物。历史上,这一带受三条江河的泛滥淹涝,耕作制度复杂,既有水浸低洼田,又有高旱田;既有单季稻,又有双季稻。因此,害虫可以终年转主为害,是三化螟(Scirpophaga incertulas)、稻纵卷叶螟(Cnaphalocrocis medinalis)、褐飞虱(Nilaparvata lugens)和粘虫(Lencania separata)的严重发生地区,病虫害的
The Dasha District is located at latitude 23o 19 ’north and longitude 112o 40’ east and is located in the enclave of the west, north and downstream of Sui Sanjiang in Guangdong. The average annual temperature of 21.3 ℃, 1,800 mm annual rainfall. The region covers an area of 60000 acres of rice, dry land 8,000 acres, rice is the main food crops. Historically, this area was flooded by the flooding of three rivers, with a complicated farming system. Both the flooded fields and the highly dry fields were present; both single-season and double-season rice. As a result, pests can be the victim of spoilage throughout the year, and are the major areas of Scirpophaga incertulas, Cnaphalocrocis medinalis, Nilaparvata lugens and Lencolia separata,