Elimination of Some Citrus Pathogens Producing Psorosis-like Leaf Symptoms, by Shoot-tip Grafting in vitro

Abstract

The percentage of plants obtained free of these pathogens ranged from 0-100, and averaged 69. STG is used in the Citrus Variety Improvement Program in Spain (CVIPS) Most trees chosen for this program contained pathogens that caused psorosis-like leaf symptoms when graft-inoculated into Pineapple sweet orange and Dweet tangor seedlings. The exact nature of these psorosislike pathogens (PLP) could not be determined from field and greenhouse symptoms. Attempts to recover PLPfree plants by STG initially failed with many varieties and with others less than 10 per cent healthy plants were obtained (Navarro et al., 1980).