kahjustaja on silmale nähtamatu u 1 mm pikkune nematood, kes eluneb lehtedes, võib eluneda ka vartes, juurtes ja õisikutes nii avamaa kui ka kasvuhoonekrüsanteemidel, kahjustada võib lisaks veel 150 erinevat taimeliiki, sh liiliaid, aedastreid, is a major pest of Chrysanthemum and one of the most imortant species to attack ornamentals, affected tissue becomes yellowish and then brown or blackish, these symptoms offten appearing as distinctive wedge-shaped, areas between the major veins, seriously affected leaves eventually wither and die