ABSTRACT.


L. G. WEATHERS1, LUIS SÁNCHEZ A.2 Y R. G. PLATT3
 

Field observations and transmission tests indicate that psorosis and exocortis viruses are present in most Chilean citrus orchards and infect all the commercially grown citrus varieties. When both viruses present as a complex in lemon trees, synergistic responses are frequently noted. Cachexia was found in one mandarin tree but its incidense as a latent virus is unknown. Tristeza, tatter-leaf, and citrange-stunt viruses are universally present in Meyer trees in Chile, but were not found in any commercially grown citrus trees.

Keywords:
1 Ph. D., Profesor de Patología Vegetal, Universidad de California, Riverside, California.
2 Ing. Agr. M. S. Estación Experimental Agronómica y Profesor Agregado de Fruticultura, Facultad de Agronomía, Universidad de Chile, Casilla 1004, Santiago, Chile.
3 Extensionista de Frutales Sub-tropicales, Universidad de California, Riverside, California.