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  Dasheen Mossaic virus of Aroids
From: Denis denis at skg.com> on 2000.07.14 at 23:01:43(5114)
Dear Aroiders:

I inadvertantly opened a can of worms and now I am endeavoring to put
the slimey little devils back in the can and tape the lid in place with
duct tape. I hope this short letter helps with the virus thing.

The following material is excerpted from Dr. Ann Chase's book, "A
Compendium of Ornamental Plant Diseases." Bear in mind that she is
writing about Commercial Aroid Foliage Crops and does have much to say
about the effects of DMV on other non-commercial Aroids such as the ones
Aroid-L Subscribers like to grow.

"Dasheen Mossaic Virus (DMV) causes the single most important Virus
disease of Foliage Plants. The Disease was first described by Zettler et
al in 1970 and has since been reported in many members of the Araceae
Family including food crops and Ornamentals?. Symptoms vary from one
host to another. They are not always apparent on infected foliage plants
or present on all their leaves. Young seedlings of Philodendron selloum
develope systemic vein chlorosis, and severe distortion and the Mossaic
symptom occur on most plants. In contrast Caladium hortulanum Birdsey
(fancy leaved Caladiums) Colocasia esculenta (L.) Schott (Dasheen or
Taro) and Xanthosoma sagittafolium (L.) Schott (Cocoyam) Develop a
feathery mossaic pattern, but many of their leaves are asymptomatic? The
most commonly infected foliage plants are Dieffenbachia spp. and
Aglaonema spp. Ring spot, mossaic patterns and leaf distortions usually
occur on infected Dieffenbachias?DMV is transmitted by Aphids in a
nonpersistent manner or mechanically in the sap from infected plants
(non-sterile cutting or harvesting tools)?. The host range of DMV has
been extensively examined. The only plants infected appear to be members
of the Araceae Family. Reported hosts are Aglaonema, Alocasia,
Amorphophallus Anthurium, Arisaema, Caladium, Colocasia, Cryptocoryne,
Dieffenbachia, Philodendron, Richardia, Spathiphyllum, Xanthosoma, and
Zantedeschia?. DMV infections of foliage plants are systemic, and no
chemicals are available for the control of Virus Diseases?. Research
done has shown that fresh corm weights of Caladiums infected with DMV
were reduced by 40% and the leaf area was reduced by 53% over uninfected
controls. "

From: StellrJ at aol.com on 2000.07.15 at 16:23:19(5124)
In a message dated 7/14/00 7:07:00 PM Eastern Daylight Time, denis@skg.com

<< "Dasheen Mossaic Virus (DMV) causes the single most important Virus

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