Needle nematode Longidorus spp'

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Needle nematodeLongidorus spp.
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How do you diagnose a corn needle nematode
problem?
herbicide injury
nematode injury
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• ectoparasite (live outside roots)
• sting and needle nematodes
• endoparasite (live inside roots)
• migratory root lesion nematode
• sedentary root knot and cyst
  nematodes

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Pratylenchus penetransroot lesion nematode
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symptoms

• lesions on roots
• stunting

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Root lesion nematode disease cycle
35 days
egg J2 J3 J4 adult
soil or root
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feeds as ectoparasite or endoparasite in root
cortex
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host/pathogen interaction

• plant responses to ecto- and migratory
  endoparasites
• 1.
• 2.
• nematodes respond by __________.

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• root knot nematodes Meloidogyne spp.
• vegetable and ornamental crops
• 4 major species

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root-knot affects both quality and yield
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juvenile stages
adult stages
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nematode feeds on 4-6 giant cells
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Diagnosing a root knot nematode problem
Which plants are infected with root knot nematode?
symptoms sign
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cyst nematode Heterodera spp.
Many species - narrow host range - named for
primary host
SCN Management Guide
cyst dead body of female
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soybean cyst nematode Heterodera glycines
SCN
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(No Transcript)
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J3
J2
nematode feeding cells
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susceptible cultivar on left / resistant on right
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strategies for dealing with conditions not
conducive to life cycle

• stay in place and deal with it root lesion
• move to a better place needle
• wait escape in time cyst
• use multiple strategies root knot

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sting or needle nematode
root lesion nematode