Sustaining host plant resistance derived through conventional and biotechnological means - Mexico, DF (Mexico) CIMMYT : 1997 - Printed
Globally, during the last four decades, large investments and long-term research efforts have been put into plant breeding to develop pest resistant varieties and hybrids of crop plants to substitute for the use of toxic chemical pesticides. More recently, new tools of biotechnology have been added to the plant breeding programs to speed up this process. Many pest resistant varieties and hybrids have been released, and in a few years, genetically engineered transgenic varieties and hybrids are expected to be commercialized and released worldwide. Pests can adapt to any management tactic depending on the selection pressure exerted on them, so deployment strategies must be designed and implemented to delay or prevent the breakdown of resistance. Some of these strategies may include use of multiple genes, combining the host plant resistance (HPR) derived through conventional and biotechnological means to pyramid or stack resistance genes, rotation or alternation of genes, use of different gene promoters, and manipulation in the levels of expression (spatial and temporal) of genes. In addition, these HPR deployment strategies must be integrated into an overall integrated pest management (IPM) program that incorporates multiple tactics (cultural, biological, mechanical, chemical, etc.) to diversify pest mortality sources and reduce subsequent selection pressure on the pests. Pest resistance management must be viewed with the context of IPM. If IPM is successfully adopted and implemented at a community or landscape level, the objective of resistance management will be automatically achieved. Hence, IPM should become a part of national agricultural policy.
633.153 / MIH