欧美国家的研究表明,土地利用多样性与作物害虫的天敌紧密相关,然而,土地利用多样性与天敌数量关系的定量研究在发展中国家还鲜见报道,发展中国家在田间和农场的规模上与西方国家现代农业有很大的差异,发展中国家的农民经常大量施用农药且农户施用农药差异显著。 Studies in Europe and the United States show that land use diversity is closely related to natural enemies of crop pests. However, quantitative studies of the quantitative relationship between land use diversity and natural enemies are still rarely reported in developing countries. The scale of developing countries in fields and farms There are big differences with modern agriculture in western countries. Farmers in developing countries often use pesticides in large quantities and the pesticides applied by farmers are significantly different.