01105naa a2200133 a 450000100080000000500110000800800410001910000180006024500790007826000090015752007460016665000130091277300460092516483442023-05-23       1989    bl uuuu     u00u1 u    #d1 aBOWMAN, J. E.  aInternational Problems in Tropical Plant Pathology.h[electronic resource]  c1989  aControl of many plant virus diseases in the tropics is difficult for several reasons. Virus-resistant or virus-tolerant cultivars are not available for many tropical crops, disease cycles are not broken by killing winter temperatures, virus and insect vector reservoirs are present throughout the year, and, typically, crops are grown in numerous small plots over a wide area with little isolation. We believe that cross protection a strategy that can be used to good advantage to selectively control virus diseases of tropical crops. It is not our porpose to justify the use of cross protection. Basic criteria for selection of cross protection as a disease control strategy are well known, and we assume these have already been considered.  aMandioca  tPlant Diseasegv.73, n.7, p.593-597, 1989