Post on 06-Apr-2018
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Root Lesion Nematode:Biology and Management
Bikash BhandariGraduate student
Department of plant, Environment and
Soil Sciences
02/16/2011
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Introduction
Lesion nematode means they produce
conspicuous necrotic lesions on host roots.
Belongs to the genus Pratylenchus
Ranked third only to Rootknot and Cyst
nematodes in terms of economic impact oncrops (Sasser and Freckman, 1987)
keys.lucidcentral.org
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Introduction
Most important species:P. penetrans(400 hosts)
P. vulnus(fruit trees
and ornamentals)
P. brachyrus(peanut,
soybean)
P. zea(corn)
P. coffee(coffee)
www.fao.org
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Taxonomy
Phylum Nematoda
Class - Secernentea
Order - Tylenchida
Superfamily - TylenchoideaFamily - Pratylenchidae
Genus -
Pratylenchus
plpnemweb.ucdavis.edu
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Distribution
World wide distribution:Asia - 40
Europe - 32
Africa - 16North America - 27
South America - 22
Ocean - 12
Antartica -1
Source: Castillo and Vovlas, 2007
bizbox.slate.com
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Distribution
Source: Castillo and Vovlas, 2007
70 species arereported.
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Biology
Migratory endoparasites
Feeding restricted entirely to root cortex (notroot stele)
Most problem in
perennial crops
apsnet.org
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About 0.3-
0.9mm long
Invisible tonaked eye
Set off lipregion
Low and flat infront
3 annules
Stylet is
prominent andhave a largebasal knob.
http://nematode.unl.edu/prapen.htm
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Biology
Oesophagus overlappedthe intestine.
2 dark spicules
Bursa
http://nematode.unl.edu/prapen.htm
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Life cycle
Sexual
Asexual
(Parthenogenesis)
Six life stages
(4-8 weeks)
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Life cycle
http://www.apsnet.org/edcenter/intropp/lessons/Nematodes/
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Symptoms
Healthy vs. lesion nematode-infected roots
systems. (Courtesy C. S. Huang)
Small yellowish dark brown lesions(glycosides)
Root girding and disintegration
hrt.msu.edu
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Symptoms
Patches of stunted and chlorotic plants
Soil test is necessary
Potato early dying disease in field. (Courtesy R.C. Rowe)
Corn field showing nematode injury to roots
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Dissemination
Irrigation and surface drainage
Transport of
infected plants/soils
uprooted.jessicareeder.comcountryliving.com
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Nematode management
Pre-plant Fumigation
Nematicides
Seed treatment
Crop rotation
Resistant varieties
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