<Ul> <Li> Chagas disease </Li> <Li> Nonvenereal endemic syphilis </Li> <Li> pinta </Li> <Li> syphilis (disputed) </Li> </Ul> <Li> Nonvenereal endemic syphilis </Li> <Li> syphilis (disputed) </Li> <P> Plants that arrived by land, sea, or air in the times before 1492 are called archaeophytes, and plants introduced to Europe after those times are called neophytes . Invasive species of plants and pathogens also were introduced by chance, including such weeds as tumbleweeds (Salsola spp .) and wild oats (Avena fatua). Some plants introduced intentionally, such as the kudzu vine introduced in 1894 from Japan to the United States to help control soil erosion, have since been found to be invasive pests in the new environment . </P>

All of the following crops were brought to the americas by european conquerors except for