TY  - SER
AU  - Valverde,R.A.
AU  - Moreno,R.
AU  - Gamez,R.
TI  - Incidence and some ecological aspects of Cowpea severe mosaic virus in two croping systems in Costa Rica
KW  - FEIJAO DE CORDA
KW  - COWPEA
KW  - MOSAICO
KW  - VIRUS
KW  - DOENCA DE PLANTA
KW  - COSTA RICA
ER  -