signs and symptoms of damage of nematodes on vegetable and small fruit crops
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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) - PowerPoint PPT PresentationTRANSCRIPT
Signs and symptoms of damage of nematodes on vegetable and
small fruit crops
Nematode Workshop 2nd Morning Session
George S. Abawi and Beth K. Gugino
Department of Plant Pathology
General field symptoms includeGeneral 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.
Accompanying root symptoms includeAccompanying root symptoms include
Galls, stubby roots, excessive branching
Necrotic lesions and general discoloration
Rots
Ditylenchus destructor Meloidogyne hapla
Most important nematodes on vegetables in the NortheastMost important nematodes on vegetables in the Northeast
Northern root-knot Meloidogyne hapla
Root-lesion Pratylenchus penetrans
Cyst nematodes Heterodera schachtii
Globodera rostochiensis
Northern Root-Knot Nematode (Meloidogyne hapla) on CarrotNorthern Root-Knot Nematode (Meloidogyne hapla) on Carrot
No Vydate at plantingNo Vydate at planting
Vydate applied at plantingVydate applied at planting
Symptoms of NRKN infection on young and mature carrots
MarketableMarketable UnmarketableUnmarketable
0 1 2 3 4 5
Northern Root-Knot and Lesion Nematode Damage on Onion
Northern Root-Knot and Lesion Nematode Damage on Onion
infested not infested
Symptoms of nematode infestation in an onion fieldSymptoms of nematode infestation in an onion field
Meloidogyne hapla
Galls on roots
Thick neck and reduced bulb size
Close-up of root-knot nematode damage on onion roots
Root-lesion nematode (Pratylenchus penetrans) in an onion root
eggs
juveniles
Pratylenchus penetrans
Lesions on soybean root
Northern Root-Knot Nematode (Meloidogyne hapla) on Lettuce
Healthy lettuce plantsStunted and uneven growth due to nematode infection
Galls on lettuce with stained egg sacs
Galls on lettuce root system
Nodulation on cloverhttp://starklab.slu.edu/Bio2000/clover
Symptoms of a heavy nematode infestation in a potato field
Golden Potato Cyst Nematode (Globodera rostochiensis)
Photo credit: Christopher Hogger, Swiss Federal Research Station for Agroecology and Agriculture, Bugwood.org
Lesions from P. penetrans infection on potato tubers
Lesions from P. penetrans infection
on potato roots
Root-knot
Potato early dying disease (PED)Potato Early Dying Disease (PED)
(Pratylenchus penetrans + Verticillium dahliae)
No galls develop on the primary roots
Northern Root-Knot Nematode (Meloidogyne hapla) galls on the fine potato roots
Severe damage to potato by M. hapla
Sugar beet cyst nematode (Heterodera schachtii) damage in a beet field
Sugar beet cyst nematode on beet
seedling roots
female cystfemale cyst
Lifecycle of Heterodera schachtii
Sugar beet cyst nematode (Heterodera schachtii) damage in cabbage microplot trial, NYSAES, 1983
UninfestedInfested with H. schachtii
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)
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
Tomato roots grown in uninfested (left) and soil infested (right) with Meloidogyne hapla
UF factsheet
UF factsheet
Root-knot nematode (Meloidogyne spp.)
damage on bean in the field and severe galling on
the roots.
Stubby root nematode (Paratrichadorus christiei) damage
on corn roots