论文部分内容阅读
珠江三角洲是广东的重要经济开发区。水稻种梢面积约447万亩(1983年)。近年来由于商品经济的发展,果、蔬、甘蔗等作物将继续有较大的扩展,现有水稻面积还会适当减少,两熟制及栽培技术将相对地稳定下来,一些由于农田生态系统变动而引起严重发生的害虫,如稻蓟马估汁不会再严重发生,稻瘿蚊、三化螟也不会象以前那样频繁严重,但在气候特别有利的情况下,仍会严重发生。有机氯被取代后重新出现灼稻黑蝽、稻象甲、稻蝗和铁甲虫的发生,将继续有所发展;但稻黑蝽、稻蝗多属局部性的严重发生。由于他们的生物学特性(如年世代数不多影响其在
The Pearl River Delta is an important economic development zone in Guangdong. Rice seedling area of about 447 acres (1983). In recent years, due to the development of commodity economy, crops such as fruits, vegetables and sugarcane will continue to expand greatly. The existing rice area will also be reduced appropriately. The two-cropping system and cultivation techniques will be relatively stable, and some crops due to changes in farmland ecosystems Pests causing serious occurrence, such as rice thrips, will no longer be seriously affected. Rice gall midge, yellow rice borer will not be as serious as before, but they will still occur seriously under particularly favorable climate conditions. After the replacement of organochlorine, the occurrence of the black bugs, the rice weevil, the rice locust and the iron beetle again will continue to develop. However, the black bugs and the rice locusts are mostly localized serious occurrence. Because of their biological characteristics (such as the age of generations affected in the