ARS(美国农业研究机构)的科学家报道,一种天然的生防病毒可混入灌溉水以杀死对玉米和棉花造成主要损害的昆虫。按照ARS去年在佐治亚州进行的大田研究,从顶部用撒水器喷到玉米上的一种核多角体病毒可减少玉米穗部幼虫25-100％,杀死百分率取决于病毒应有的时间和比率。昆虫学家JohnJ.Hamm说,这种应用病毒的新方法将灌溉和害虫防治结合在一起,对种植者来说很省钱又有效。他和昆虫学家Laurence D.Chandler也 ARS scientists report that a natural biocontrol virus can be mixed with irrigation water to kill insects that cause major damage to corn and cotton. According to a field study conducted last year in Georgia by ARS in Georgia, a nuclear polyhedrosis virus sprayed onto maize from the top with a sprinkler reduced corn ear larvae by 25-100% depending on the time and rate of virus . Entrapist John J. Hamm said the new method of applying the virus combines irrigation and pest control and is cost-effective and effective for growers. He and entomologist Laurence D. Chandler also