Submitted to: Interamerican Society of Tropical Horticulture Proceedings
Publication Type: Proceedings
Publication Acceptance Date: September 4, 1997
Publication Date: N/A
The rootstock situation in many production areas is changing in response to new disease pressures, especially tristeza virus disease. In the process new problems have appeared in the past and now in Central America, one of the few places where sour orange rootstock is still being used. This rootstock has only one major weakness, lack of tolerance to tristeza virus disease. Because it doesn't react to exocortis, xyloporosis and other viruses it is often a symptomless carrier. When trees are propagated from these latent carriers on susceptible rootstocks disease symptoms appear a couple of years after planting. Although citrus blight, a disease of unknown cause, can not be graft transmitted, there still is the possibility of decline symptoms emerging when trees on susceptible rootstocks are planted in humid areas. This is happening in Central America now.