Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract

Occurrence and integrated control of Phalaenopsis virus diseases.

Abstract

Phalaenopsis plants showing different leaf symptoms, such as light yellow spot, short streak, patch, pitted necrosis, white ring, yellow ring, concentric rings and no-symptoms, were examined by ELISA for cymbidium mosaic virus (CyMV), odontoglossum ringspot virus (ORSV), cucumber mosaic virus (CMV) and cymbidium ringspot virus (CyRSV). CyMV and ORSV, but no CMV and CyRSV were detected in the examination. The wild species and hybrid plants of Phalaenopsis, Doritaenopsis and Doritis collected from Taiwan, Japan, UK and USA were found to be infected by CyMV and/or ORSV with an infection rate (per country of origin) of 35.8%, 18.2%, 18.2% and 33.3%, respectively. The ratio among CyMV, ORSV and complex infection was 62.9%:18.2%:18.9%. An integrated control method was developed for the virus diseases of Phalaenopsis occurring in the greenhouse as follows: (1) developing a new cultivation management system with sphagnum moss instead of tree fern for the planting medium to grow healthy hybrid seedlings with vigorous roots, reducing root pruning on transplanting, blocking the infection and spread of viruses, (2) destroying virus infected plants, and (3) disinfecting pruning tools and cutting knives with a mixture of 4% formalin and 4% NaOH, and beds, pots and the greenhouse with 10% (v/v) Clorox bleach solution (5% sodium hypochloride, NaCl0).