更多的苍蝇和寄生虫 ，这样农民们就不得不想办法来解决这个问题。另外
，屎克螂还有助于将营养物质重新输送回土壤 。如果没有它们，辛勤劳作的农民们就要花费更多的钱来购买肥料
。由此 ，研究人员得出的结论是
，在这方面昆虫对美国经济的贡献价值为3.8亿美元。

报道说，此项研究的对象仅仅为野生昆虫为美国社会创造的财富 ，并不包括诸如蜂蜜和丝绸等由昆虫带来的商业产品的价值 。这项研究的具体结果发表在最近一期的《生物科学》杂志上。

Think twice before you swat a fly or squash a bug: A newstudysays insects contribute more than $57 billion (euro47 billion)ayear to the U.S. economy.

And that is a very conservative estimate, said John Losey,aCornell University associate professor of entomology whoconductedthe study, published in the current issue of thejournalBioScience.

Most insects tirelessly perform ns that improve ourenvironmentand lives in ways that scientists are only beginningtounderstand, said Losey, who wrote the study with Mace Vaughanofthe Portland, Oregon-based Xerces Society forInvertebrateConservation.

There are more than 1 million named insect species _ andprobablyan equal number unidentified _ making them the mostabundant lifeform on the planet.