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Signs and symptoms of damage of nematodes on vegetable and small fruit crops

Nematode Workshop 2 nd Morning Session. Signs and symptoms of damage of nematodes on vegetable and small fruit crops. George S. Abawi and Beth K. Gugino Department of Plant Pathology. General field symptoms include. Reduced growth Yellowing of foliage (nutrient deficiency-like)

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Signs and symptoms of damage of nematodes on vegetable and small fruit crops

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  1. Nematode Workshop 2nd Morning Session Signs and symptoms of damage of nematodes on vegetable and small fruit crops George S. Abawi and Beth K. Gugino Department of Plant Pathology

  2. General field symptoms include Reduced growth Yellowing of foliage (nutrient deficiency-like) Excessive wilting in hot or dry weather Reduced yields Poor quality produce Symptom severity are nematode density dependent.

  3. Accompanying root symptoms include Galls, stubby roots, excessive branching Necrotic lesions and general discoloration Rots Ditylenchus destructor Meloidogyne hapla

  4. Most important nematodes on vegetables in the Northeast Northern root-knotMeloidogyne hapla Root-lesion Pratylenchus penetrans Cyst nematodes Heterodera schachtii Globodera rostochiensis

  5. Northern Root-Knot Nematode (Meloidogyne hapla) on Carrot

  6. Vydate applied at planting No Vydate at planting

  7. Symptoms of NRKN infection on young and mature carrots

  8. Marketable Unmarketable 0 2 3 4 5 1

  9. Northern Root-Knot and Lesion Nematode Damage on Onion infested not infested

  10. Symptoms of nematode infestation in an onion field

  11. Meloidogyne hapla

  12. Close-up of root-knot nematode damage on onion roots Thick neck and reduced bulb size Galls on roots

  13. Root-lesion nematode (Pratylenchus penetrans) in an onion root eggs juveniles

  14. Pratylenchus penetrans Lesions on soybean root

  15. Northern Root-Knot Nematode (Meloidogyne hapla) on Lettuce

  16. Stunted and uneven growth due to nematode infection Healthy lettuce plants

  17. Galls on lettuce with stained egg sacs Galls on lettuce root system

  18. http://starklab.slu.edu/Bio2000/clover Nodulation on clover

  19. Symptoms of a heavy nematode infestation in a potato field

  20. Photo credit: Christopher Hogger, Swiss Federal Research Station for Agroecology and Agriculture, Bugwood.org Golden Potato Cyst Nematode (Globodera rostochiensis)

  21. Lesions from P. penetrans infection on potato tubers Lesions from P. penetrans infection on potato roots

  22. Root-knot

  23. Potato Early Dying Disease (PED) (Pratylenchus penetrans + Verticillium dahliae) Potato early dying disease (PED)

  24. No galls develop on the primary roots

  25. Northern Root-Knot Nematode (Meloidogyne hapla) galls on the fine potato roots

  26. Severe damage to potato by M. hapla

  27. Sugar beet cyst nematode (Heterodera schachtii) damage in a beet field

  28. Sugar beet cyst nematode on beet seedling roots female cyst

  29. Lifecycle of Heterodera schachtii

  30. Sugar beet cyst nematode (Heterodera schachtii) damage in cabbage microplot trial, NYSAES, 1983 Uninfested Infested with H. schachtii

  31. Roots of cabbage grown in soil heavily infested with H. schachtii (right) vs. uninfested soil (left) Small loose cabbage head from plant grown in soil heavily infested with H. schachtii (right) vs. uninfested soil (left)

  32. Yield of cabbage grown in heavy textured soil infested with increasing densities of sugar beet cyst nematode (Heterodera schachtii), NYSAES, 1983 Fumigated 10 eggs/cc 20 eggs/cc 40 eggs/cc

  33. Tomato roots grown in uninfested (left) and soil infested (right) with Meloidogyne hapla

  34. UF factsheet

  35. UF factsheet

  36. Root-knot nematode (Meloidogyne spp.) damage on bean in the field and severe galling on the roots.

  37. Stubby root nematode (Paratrichadorus christiei) damage on corn roots

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