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据Spore杂志报道,在非洲,因螟虫的危害每年造成玉米、玉蜀黍、小米损失15~20%。其中有的螟虫危害严重,如 30年代最先于非洲发现的玉米螟。目前在东非,这些破坏性大的螟虫仍呈上升趋势。螟虫具有大部份时间钻在植株茎杆内的生活习性,故杀虫药剂难以触及,致使化学防治失败。1991年,国际昆虫生理生态研究中心(ICIPE)和国际生物防治研究学会(IIBC)在巴基斯坦发现了一种寄生蜂(Cotesia flavipes)对螟虫具有惊人的摄食能力。
According to Spore magazine, in Africa, annual damage to corn, maize and millet due to stem borers is 15-20%. Some of these stem borers are particularly devastating, such as the corn borer first found in Africa in the 1930s. Currently in East Africa, these devastating stem borers are still on the rise. Stem borers have a habit of drilling most of the time inside plant stalks, so insecticides are hard to reach, causing chemical control failure. In 1991, ICIPE and IIBC in Pakistan discovered a parasitic wasps (Cotesia flavipes) with amazing feeding ability to stem borers.