January 2019 - 41

the USDA-APHIS said on its website.
Infested potato plants can exhibit
yellowing, wilting or death of foliage,
none of which has been observed in
the affected Idaho fields.
Tina Gresham is the director of the
USDA-APHIS's Pale Cyst Nematode
program. She delivered a presentation
during the The Big Idaho Potato
Harvest Meeting in Fort Hall on Nov.
14. Gresham shared her notes with
Spudman from that presentation,
which covered the state of the program
and the status of PCN eradication.
* In general, the infestations detected
in recent years are much smaller
than those detected in the early
years of the program. In recent
years, most new fields are detected
at the lowest possible detection
level for the survey method in
use. This indicates that fields are
being
detected much
the
movement
earlier
in
infestation process and soil
from those fields (and
by cascading effect, the exposure of
other fields) is being contained more
quickly. Earlier detection means that
fewer fields are exposed over time.
In general, the infestations detected in recent
years are much smaller than those detected in
the early years of the program.
* Eradication treatments are ongoing
with 1,3-dichloropropene (Telone
II) and the trap crop litchi tomato
(Solanum sisymbriifolium). Both
have been effective at reducing
viable PCN populations on infested
fields and also have been good
alternatives to methyl bromide soil
fumigant that the program stopped
using after 2014.
* Four fields have been treated with
the litchi tomato trap crop since
2015; no viable PCN has been
detected on any of them.
* Litchi tomato is listed by ISDA
as an invasive species because it
is non-native to Idaho. Its use on
PCN-infested fields is permitted
with strict requirements to ensure
the plant is contained to treatment
areas and is not allowed to produce
mature fruit (seeds).
* The PCN program monitors all
current and past fields treated with
litchi tomato (a minimum of five years
after treatment) to ensure the plant
does not carry over after treatment.
* Despite rumors to the contrary,
litchi tomato has not been found
anywhere outside of the four treated
fields.
* Telone used by the PCN program
under a 24c (special local needs
label) allowing treatment rate up to
36 gallons per acre, which is higher
than the standard application rate
(typically ~20 gallons per acre). More
than one annual treatment is required
but multiple treatments have been
effective at reducing PCN viability.
SORTING AND
PEELING SOLUTIONS
FOR THE POTATO INDUSTRY
For more than 40 years, TOMRA Food designs
and manufactures sensor-based sorting machines
and integrated post-harvest solutions for the food
industry, using the world's most advanced grading,
sorting, peeling and analytical technology.
food.us@tomra.com
www.tomra.com/food
Spudman * January 2019
41

http://www.tomra.com/food

January 2019

Table of Contents for the Digital Edition of January 2019

January 2019 - 1
January 2019 - 2
January 2019 - 3
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https://www.nxtbook.com/greatamericanmediaservices/SPUD/spudman-november-december-2023
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