PCA - Nematodes A Exam
2026-2027
Expert-Verified Questions and Answers
(With A+ Grades Guarantee)
, Describe why ectoparasitic nematodes are not found in They spend their entire lives outside of roots in the soil, so they will be found in soil
root samples. samples.
Describe why root-knot nematodes may not be found in a Dagger and needle nematodes also produce root galling, so root galls caused by
root sample that has nematode galls on it nematodes are not always caused by root-knot nematodes.
List the common units used to report nematode population Basis of a volume or weight of soil, or weight of plant tissue.
levels from soil and from roots.
Describe the factors that influence the efficiency of the Size of soil particles, organic matter content and size, shape and motility of
extraction method. nematode, and capability of the technician
Explain extraction efficiency and its importance in Indicates percentage of nematodes recovered from a sample to which a known
nematode sampling. number of nematodes has been added.
Identify the different extraction methods used by labs. Sieving, Fenwick Can, Elutriator, Baermann Funnel, Mist, Sugar Flotation, Sugar
Centrifugation, Staining Roots, Greenhouse Bioassay
List the preferred extraction method for nematodes of Baermann funnel, mist chambers
foliage or stems
List the preferred extraction method for dagger nematodes Baermann funel, Sugar flotation and Centrifugation
List the preferred extraction method for cyst nematodes Sugar flotation and centrigufation, Baermann funnel
List factors to consider in conjunction with every nematode Suitability of sample, efficiency of extraction method, pathogenicity of nematodes
sample present, biological and environmental factors that might influence pathogenicity
Define damage threshold. Level at which the pest is expected to damage the crop
Describe the factors that influence the damage threshold Temperature at time of planting
for nematodes.
List the resources for finding out methods for controlling UC IPM Pest Management Guidelines
nematodes in specific crops.
Describe the role of the California Nursery Certification Keeps devastating nematodes out of state, certifies nurseries as having nematode-
program in preventing the spread of nematodes free stock so that they may sell in California.
List methods used to prevent the spread of nematodes Quarantine, certified planting materials, check suspect materials before planting,
nematodes may be present in manure, clean equipment before moving, avoid
contaminated irrigation water
2026-2027
Expert-Verified Questions and Answers
(With A+ Grades Guarantee)
, Describe why ectoparasitic nematodes are not found in They spend their entire lives outside of roots in the soil, so they will be found in soil
root samples. samples.
Describe why root-knot nematodes may not be found in a Dagger and needle nematodes also produce root galling, so root galls caused by
root sample that has nematode galls on it nematodes are not always caused by root-knot nematodes.
List the common units used to report nematode population Basis of a volume or weight of soil, or weight of plant tissue.
levels from soil and from roots.
Describe the factors that influence the efficiency of the Size of soil particles, organic matter content and size, shape and motility of
extraction method. nematode, and capability of the technician
Explain extraction efficiency and its importance in Indicates percentage of nematodes recovered from a sample to which a known
nematode sampling. number of nematodes has been added.
Identify the different extraction methods used by labs. Sieving, Fenwick Can, Elutriator, Baermann Funnel, Mist, Sugar Flotation, Sugar
Centrifugation, Staining Roots, Greenhouse Bioassay
List the preferred extraction method for nematodes of Baermann funnel, mist chambers
foliage or stems
List the preferred extraction method for dagger nematodes Baermann funel, Sugar flotation and Centrifugation
List the preferred extraction method for cyst nematodes Sugar flotation and centrigufation, Baermann funnel
List factors to consider in conjunction with every nematode Suitability of sample, efficiency of extraction method, pathogenicity of nematodes
sample present, biological and environmental factors that might influence pathogenicity
Define damage threshold. Level at which the pest is expected to damage the crop
Describe the factors that influence the damage threshold Temperature at time of planting
for nematodes.
List the resources for finding out methods for controlling UC IPM Pest Management Guidelines
nematodes in specific crops.
Describe the role of the California Nursery Certification Keeps devastating nematodes out of state, certifies nurseries as having nematode-
program in preventing the spread of nematodes free stock so that they may sell in California.
List methods used to prevent the spread of nematodes Quarantine, certified planting materials, check suspect materials before planting,
nematodes may be present in manure, clean equipment before moving, avoid
contaminated irrigation water
