Spudman April 2023 - 10
varieties are available for the latter.
Both of these species are regulated
The second group of potato nematodes
is the RKNs. Found all over the world,
they make the tubers look bumpy. No
commercial potato cultivars are resistant
to RKNs. The Northern RKN is common
in cooler states, and the Columbia RKN
occurs only in the Northwestern states.
The third group is lesion nematodes,
Pratylenchus spp., found throughout
North America. They feed within
the plant roots. The feeding damage
predisposes the plant to secondary
infections, such as the fungus that
causes Early Dying syndrome.
The final group, stubby root
nematodes, feed on root surfaces,
causing many stubby roots to form.
Alone, they do not cause commercial
damage, but they transmit tobacco
rattle virus, which causes corky spot
disease. The disease impairs tuber
quality, leading to crop rejection.
A cyst that has been broken open reveals the hundreds of eggs that one cyst holds.
Photo: Dandurand program at University of Idaho.
Prevention and management of the
four types of nematodes will improve
as PAPAS and other research projects
discover new information. To keep up
on the latest developments on how to
manage nematodes, check the website
www.potatonematodes.com and local
Cooperative Extension websites.
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Spudman * April 2023
Spudman April 2023
Table of Contents for the Digital Edition of Spudman April 2023
Spudman April 2023 - 1
Spudman April 2023 - 1A
Spudman April 2023 - 2A
Spudman April 2023 - 2
Spudman April 2023 - 3
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