01365naa a2200193 a 450000100080000000500110000800800410001902000180006010000200007824500600009826000090015830000140016752007380018165000200091965000220093965000140096165300390097577301570101411959672025-07-07       2002    bl uuuu     u00u1 u    #d  a0-8493-0836-41 aLOBO JUNIOR, M.  aAlien plant pathogens in Brazil.h[electronic resource]  c2002  ap. 69-88.  aSeeds, seedlings, and fruits of a large array of crops were freely introduced for almost the next four centuries with a complete absence of phytosanitary protection measures. Little could be done for many years, given the lack of knowledge of the biotic causes of plant diseases, which were proven with the aid of Koch's postulates at the end of the 19th century. Adding qualitative losses, chemical control costs, and environmental damages yields a very high cost to be paid by a country in which 18% of the population is undemourished. The main diseases that enhance this situation, the entrance and spread of alien pathogens in the country, and the economical, social, and environmental consequences are discussed in this chapter.  aPlant pathogens  aDoença de Planta  aPatógeno  aPatógenos de plantas alienígenas  tIn: PIMENTEL, D. (ed.). Biological invasions: economic and environmental costs of alien plant, animal, and microbe species. Boca Raton: CRC Press, 2002.