Guideline for the efficacy evaluation of nematicides. No. 188: Aphelenchoides spp. on ornamentals

aphelenchoides begonia chrysanthemum efficiency eficacia ensayo methode methods nematicides nematocidas nematocide nematodos de las plantas ornamental plants plant nematodes plantas ornamentales plante ornementale primula saintpaulia ionantha testage testing verbenaceae weigelia