Iris mosaic virus

Iris mosaic virus (Betacarmovirus iridis) is a viral pathogen that significantly impacts the health and aesthetic value of various ornamental species. It causes systemic infection throughout the host plant, interfering with cellular functions and plant development.

The primary hosts of this virus are irises. The pathogen survives and thrives within the plant's vascular system, slowly weakening the host and making it more susceptible to environmental stress and secondary fungal infections.

Symptoms are most visible on foliage as light green or yellow mosaics, mottling, and chlorotic streaks. Flowers often exhibit color-breaking symptoms, where petals show irregular streaks or spots, significantly reducing their ornamental quality and commercial marketability.

Transmission occurs primarily through aphid vectors in a non-persistent manner, meaning the insects can spread the virus very quickly during brief feeding probes. Additionally, human activities such as dividing rhizomes with contaminated tools or improper handling of infected plant parts play a major role in the spread.

Since there are no cures for viral infections in plants, the strategy focuses entirely on prevention and sanitation. Growers must prioritize the selection of virus-free stock, strictly sanitize all cutting tools between plants, maintain rigorous pest control programs, and promptly rogue out any plants showing symptoms of infection to protect the rest of the collection.