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东亚飞蝗(Locusta migratoria manilensis Mey.)是世界性的一大害虫。它具有散居型、中间型和群居型三种型态,各型之间可随其密度的增减而相互转变。1921年Uvarov就论述过蝗虫因其密度不同可产生群居型,首先创立了蝗虫型变学说。1950年Key也述及型变是由于其它原因所引起的对密度过剩的迁徙。Kennedy(1961)、内田(1972)等亦认为,高密度可促进型变。但何种密度可导致型变,尚未见报道。为了探讨蝗蝻种群与型变间的关系,研究其随密度变化而出现的不同生态型变规律,我们于1988～1990年对这一问题进行了研究,旨在为蝗虫防治提供理论依据。
Locusta migratoria manilensis Mey. Is a worldwide pest. It has three types of diaspora, intermediate and gregarious, with the density of each type can change with each other. In 1921 Uvarov discussed that locusts can produce gregarious populations due to their different densities, and first established the locust-type theory. Key also mentioned in 1950 that type change is due to other reasons caused by the migration of excess density. Kennedy (1961), Uchida (1972) also believe that high-density can promote type change. However, what kind of density can lead to type change has not been reported. In order to discuss the relationship between the locust species and the type of transformation, and to study the different ecological changes that occur with the density, we studied this issue from 1988 to 1990 with the aim of providing a theoretical basis for locust control.