01234naa a2200205 a 450000100080000000500110000800800410001910000170006024500480007726000090012552006980013465000190083265000140085165000230086565300160088865300250090465300270092965300140095677300580097013658242012-01-03       1973    bl ---       0--  u    #d1 aSTERN, V. M.  aEconomic Theresolds.h[electronic resource]  c1973  aOver the past three decades a wide variety of new and powerfull chemical tools have come into the hands of applied entomologists. The benefits that these chemicals have brought to marking stand as a remarkable testimonial to technological advancement in terms of lives saved, increased food production, and economic gain. However, the pesticide blessing has not been an unmixed one. Throught the widespread and sometimes indiscriminate use of pesticides a number of serious problems have arisen, including air, water, and soil pollution, increased numbers of pests, generally premature resistance of many pest arthropods to pesticides, and disruption of ecological systems (6, 42, 57, 79, 84).  asoil pollution  aPesticida  aPoluição do Solo  aEntolmology  aEntomologia aplicada  aEntomologia econômica  aPesticide  tAnnual Review of Entomologygv. 18, p. 259-280, 1973.