July 2022 - 24
PLANT HEALTH
Bacterial blight on
geranium - latently
infected cuttings starting
to wilt in the greenhouse.
Bacterial blight on ivy
geranium - spots,
necrotic wedge
and chlorosis - ivy
geranium.
Bacterial
blight on
geranium -
leaf spots with
chlorosis.
Bacterial blight on
geranium - leaf spots
on hybrid seedling
geraniums that were
infected by contact with
infected cutting-grown
geraniums (hanging
baskets of infected zonals
were hung over them).
Chili pepper mild mottle virus this year
caused stunting and a very dramatic
flower break in some cultivars, but leaf
mottling was more subtle and harder
to see. As with other tobamoviruses,
this virus is spread by merely handling
the plants, so the problem was likely
distributed before growers realized the
pathogen was on the premises.
Fortunately, the Agdia immunostrip test
for TMV was found to detect CPMMoV, so
growers were able to use that tool to check
suspicious symptoms and identify infected
material for discard.
Although there were also a few
scattered cases of TMV seen on petunia
and calibrachoa this year, TMV itself
did not appear to be widespread this
season. Regardless, as long as TMV test
kits indicated a positive, it was a good
decision to discard calibrachoa with virus
symptoms, no matter what tobamovirus
was involved.
Begonia with Impatiens
Necrotic Spot Virus (INSV)
OTHER CROP PROBLEMS TOO
Another virus problem, alternanthera
mosaic virus (AltMV, a potexvirus) was
seen on portulacas for the first time in
a number of years. The symptoms were
misshapen leaves, with irregular outlines
and pale spots.
And losses to impatiens necrotic spot
virus (INSV) were also high in some
greenhouses. One business encountered
two INSV-infected crops: New Guinea
impatiens (brown zonate leaf lesions)
and Nonstop begonias (pronounced
yellow leaf mottling).
Interestingly, chickweed on the
greenhouse floor also tested positive.
It is important to remember weed
control when you are trying to eradicate
thrips-borne tospoviruses (INSV as well as
tomato spotted wilt virus, TSWV) from your
greenhouse! Test kits specific for AltMV,
INSV and TSWV are all available to help you.
Good scouting and prompt roguing out are
your best defenses against these intractable
bacterial and viral diseases.
Margery Daughtrey is senior Extension associate
in the Long Island Horticultural Research &
Extension Center at Cornell University. She can
be reached at mld9@cornell.edu.
24 JULY 2022 GPNMAG.COM
http://www.GPNMAG.COM
July 2022
Table of Contents for the Digital Edition of July 2022
July 2022 - 1
July 2022 - 2
July 2022 - 3
July 2022 - 4
July 2022 - 5
July 2022 - 6
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https://www.nxtbook.com/greatamericanmediaservices/GPN/gpn-new-varieties-digital-guide-2023
https://www.nxtbook.com/greatamericanmediaservices/GPN/september-2022
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https://www.nxtbook.com/greatamericanmediaservices/GPN/january-2022
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https://www.nxtbook.com/greatamericanmediaservices/GPN/august-2021
https://www.nxtbook.com/greatamericanmediaservices/GPN/big-grower-july-2021
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https://www.nxtbook.com/greatamericanmediaservices/GPN/big-grower-january-2021
https://www.nxtbook.com/greatamericanmediaservices/GPN/january-2021
https://www.nxtbook.com/greatamericanmediaservices/GPN/december-2020
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https://www.nxtbook.com/greatamericanmediaservices/GPN/november-2020
https://www.nxtbook.com/greatamericanmediaservices/GPN/october-2020
https://www.nxtbook.com/greatamericanmediaservices/GPN/big-grower-september-2020
https://www.nxtbook.com/greatamericanmediaservices/GPN/september-2020
https://www.nxtbook.com/greatamericanmediaservices/GPN/august-2020
https://www.nxtbook.com/greatamericanmediaservices/GPN/big-grower-july-2020
https://www.nxtbook.com/greatamericanmediaservices/GPN/july-2020
https://www.nxtbook.com/greatamericanmediaservices/GPN/june-2020
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https://www.nxtbook.com/greatamericanmediaservices/GPN/californiaspringtrials-2020
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https://www.nxtbook.com/greatamericanmediaservices/GPN/march-2020
https://www.nxtbook.com/greatamericanmediaservices/GPN/february-2020
https://www.nxtbook.com/greatamericanmediaservices/GPN/cannabisguide-2020
https://www.nxtbook.com/greatamericanmediaservices/GPN/hempguide-2020
https://www.nxtbook.com/greatamericanmediaservices/GPN/big-grower-january-2020
https://www.nxtbook.com/greatamericanmediaservices/GPN/january-2020
https://www.nxtbook.com/greatamericanmediaservices/GPN/december-2019
https://www.nxtbook.com/greatamericanmediaservices/GPN/big-grower-november-2019
https://www.nxtbook.com/greatamericanmediaservices/GPN/november-2019
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https://www.nxtbook.com/greatamericanmediaservices/GPN/september-2019
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https://www.nxtbook.com/greatamericanmediaservices/GPN/undercontrol-2019
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