PCA NEMATODES EXAM NEWEST 2026 | COMPLETE
200 QUESTIONS AND CORRECT DETAILED ANSWERS
| BRAND NEW VERSION | ALREADY GRADED A+
CORE DOMAINS
Nematode Biology and Morphology
Nematode Taxonomy and Identification
Nematode-Plant Interactions and Damage Symptoms
Nematode Sampling and Extraction Methods
Economic Thresholds and Damage Assessment
Integrated Pest Management (IPM) Strategies
Chemical Nematicides (Fumigants and Nonfumigants)
Biological and Cultural Control Methods
Host Resistance and Crop Rotation
Regulatory Compliance and California Nursery Certification
INTRODUCTION
This comprehensive examination is designed to assess the knowledge and practical
skills required for obtaining the Pest Control Advisor (PCA) Nematodes
Certification. The exam covers essential topics including plant-parasitic nematode
identification, biology and life cycles, host-parasite relationships, crop damage
symptoms, soil sampling techniques, diagnostic procedures, economic thresholds,
and integrated pest management strategies. Candidates must demonstrate
proficiency in nematode management approaches including chemical, biological,
cultural, and regulatory controls. This assessment prepares candidates for
effective nematode management in California agricultural systems, emphasizing
practical decision-making and field application skills.
SECTION ONE: QUESTIONS 1 – 100
QUESTION 1
,Describe the relative size of plant-feeding nematodes.
A. All are visible to the naked eye, approximately 1-2 cm in length
B. Great variability exists, ranging from 0.25 µm to 12 mm in length
C. They are all microscopic, less than 0.1 mm in length
D. They range from 1-5 mm in length with no significant variation
Correct answer: B
RATIONALE: Plant-parasitic nematodes exhibit great variability in size,
ranging from 0.25 µm to 12 mm in length. Most are microscopic and require
magnification for observation, but some larger species can be seen with the naked
eye . This size range variation has significant implications for sampling and
extraction methodology.
QUESTION 2
Name the five to six life stages of plant-parasitic nematodes in correct
developmental order.
A. Egg, larva, pupa, adult
B. Egg, juvenile 1 (J1), juvenile 2 (J2), juvenile 3 (J3), juvenile 4 (J4), adult
C. Spore, juvenile, adult
D. Egg, nymph, adult
Correct answer: B
RATIONALE: Plant-parasitic nematodes undergo a simple life cycle
consisting of an egg stage, four juvenile stages (J1 through J4), and the adult
stage . The first molt occurs within the egg, so the infective stage that hatches is
typically the J2 stage for most endoparasitic nematodes.
QUESTION 3
Describe the shape and size of root-knot nematode (Meloidogyne spp.) adults.
A. Both males and females are worm-shaped and slender
B. Females are round and lose their vermiform shape as adults; males retain
vermiform shape
,C. Both are pear-shaped and sedentary
D. Females are long and slender; males are round and swollen
Correct answer: B
RATIONALE: Root-knot nematode females undergo dramatic morphological
change as they mature, becoming pear-shaped or spherical as they become
sedentary inside plant roots. Males retain the slender, worm-shaped (vermiform)
appearance characteristic of most nematodes . This sexual dimorphism is important
for species identification.
QUESTION 4
Describe the shape and size of cyst nematode (Heterodera and Globodera spp.)
adults.
A. Adult female is swollen, and eggs are retained inside the body; the body
becomes a cyst after the female dies
B. Both sexes are vermiform and mobile
C. Adult female is elongated and migratory
D. The female is smaller than the male
Correct answer: A
RATIONALE: Cyst nematode females become swollen and sedentary,
retaining their eggs within their body. After the female dies, the body wall hardens
into a protective structure called a cyst, which can persist in soil for many years
and contains viable eggs . This adaptation makes cyst nematodes particularly
difficult to manage.
QUESTION 5
Describe the shape and size of lesion nematode (Pratylenchus spp.) adults.
A. Large and round
B. Small, needle-like, and vermiform
C. Pear-shaped and swollen
D. Coiled and thick
, Correct answer: B
RATIONALE: Lesion nematodes are small, vermiform (worm-shaped), and
needle-like in appearance . They are migratory endoparasites that move through
root tissues, creating lesions and damage as they feed and reproduce.
QUESTION 6
Describe how nematode shape affects the choice of extraction method.
A. Shape is not a factor; all methods work for all nematodes
B. Larger, swollen nematodes may be observed directly on the root system; smaller
nematodes require actual extraction from soil or tissue
C. Only the size matters, not the shape
D. All nematodes require the same extraction method regardless of shape
Correct answer: B
RATIONALE: The shape and size of nematodes significantly influence
extraction method selection. Larger, swollen nematodes (such as cyst and root-knot
females) may be visible on roots and can be directly observed, while smaller
vermiform nematodes require extraction from soil or plant tissue using specialized
techniques such as sieving, Baermann funnel, or sugar centrifugation .
QUESTION 7
Define "vermiform."
A. Spherical or pear-shaped
B. Worm-shaped or resembling a worm
C. Coiled like a spring
D. Thread-like with a spiral shape
Correct answer: B
RATIONALE: "Vermiform" literally means worm-shaped . This term
describes the slender, cylindrical, elongated shape characteristic of most nematodes
in their mobile stages, distinguishing them from the swollen, sedentary stages of
some species.
200 QUESTIONS AND CORRECT DETAILED ANSWERS
| BRAND NEW VERSION | ALREADY GRADED A+
CORE DOMAINS
Nematode Biology and Morphology
Nematode Taxonomy and Identification
Nematode-Plant Interactions and Damage Symptoms
Nematode Sampling and Extraction Methods
Economic Thresholds and Damage Assessment
Integrated Pest Management (IPM) Strategies
Chemical Nematicides (Fumigants and Nonfumigants)
Biological and Cultural Control Methods
Host Resistance and Crop Rotation
Regulatory Compliance and California Nursery Certification
INTRODUCTION
This comprehensive examination is designed to assess the knowledge and practical
skills required for obtaining the Pest Control Advisor (PCA) Nematodes
Certification. The exam covers essential topics including plant-parasitic nematode
identification, biology and life cycles, host-parasite relationships, crop damage
symptoms, soil sampling techniques, diagnostic procedures, economic thresholds,
and integrated pest management strategies. Candidates must demonstrate
proficiency in nematode management approaches including chemical, biological,
cultural, and regulatory controls. This assessment prepares candidates for
effective nematode management in California agricultural systems, emphasizing
practical decision-making and field application skills.
SECTION ONE: QUESTIONS 1 – 100
QUESTION 1
,Describe the relative size of plant-feeding nematodes.
A. All are visible to the naked eye, approximately 1-2 cm in length
B. Great variability exists, ranging from 0.25 µm to 12 mm in length
C. They are all microscopic, less than 0.1 mm in length
D. They range from 1-5 mm in length with no significant variation
Correct answer: B
RATIONALE: Plant-parasitic nematodes exhibit great variability in size,
ranging from 0.25 µm to 12 mm in length. Most are microscopic and require
magnification for observation, but some larger species can be seen with the naked
eye . This size range variation has significant implications for sampling and
extraction methodology.
QUESTION 2
Name the five to six life stages of plant-parasitic nematodes in correct
developmental order.
A. Egg, larva, pupa, adult
B. Egg, juvenile 1 (J1), juvenile 2 (J2), juvenile 3 (J3), juvenile 4 (J4), adult
C. Spore, juvenile, adult
D. Egg, nymph, adult
Correct answer: B
RATIONALE: Plant-parasitic nematodes undergo a simple life cycle
consisting of an egg stage, four juvenile stages (J1 through J4), and the adult
stage . The first molt occurs within the egg, so the infective stage that hatches is
typically the J2 stage for most endoparasitic nematodes.
QUESTION 3
Describe the shape and size of root-knot nematode (Meloidogyne spp.) adults.
A. Both males and females are worm-shaped and slender
B. Females are round and lose their vermiform shape as adults; males retain
vermiform shape
,C. Both are pear-shaped and sedentary
D. Females are long and slender; males are round and swollen
Correct answer: B
RATIONALE: Root-knot nematode females undergo dramatic morphological
change as they mature, becoming pear-shaped or spherical as they become
sedentary inside plant roots. Males retain the slender, worm-shaped (vermiform)
appearance characteristic of most nematodes . This sexual dimorphism is important
for species identification.
QUESTION 4
Describe the shape and size of cyst nematode (Heterodera and Globodera spp.)
adults.
A. Adult female is swollen, and eggs are retained inside the body; the body
becomes a cyst after the female dies
B. Both sexes are vermiform and mobile
C. Adult female is elongated and migratory
D. The female is smaller than the male
Correct answer: A
RATIONALE: Cyst nematode females become swollen and sedentary,
retaining their eggs within their body. After the female dies, the body wall hardens
into a protective structure called a cyst, which can persist in soil for many years
and contains viable eggs . This adaptation makes cyst nematodes particularly
difficult to manage.
QUESTION 5
Describe the shape and size of lesion nematode (Pratylenchus spp.) adults.
A. Large and round
B. Small, needle-like, and vermiform
C. Pear-shaped and swollen
D. Coiled and thick
, Correct answer: B
RATIONALE: Lesion nematodes are small, vermiform (worm-shaped), and
needle-like in appearance . They are migratory endoparasites that move through
root tissues, creating lesions and damage as they feed and reproduce.
QUESTION 6
Describe how nematode shape affects the choice of extraction method.
A. Shape is not a factor; all methods work for all nematodes
B. Larger, swollen nematodes may be observed directly on the root system; smaller
nematodes require actual extraction from soil or tissue
C. Only the size matters, not the shape
D. All nematodes require the same extraction method regardless of shape
Correct answer: B
RATIONALE: The shape and size of nematodes significantly influence
extraction method selection. Larger, swollen nematodes (such as cyst and root-knot
females) may be visible on roots and can be directly observed, while smaller
vermiform nematodes require extraction from soil or plant tissue using specialized
techniques such as sieving, Baermann funnel, or sugar centrifugation .
QUESTION 7
Define "vermiform."
A. Spherical or pear-shaped
B. Worm-shaped or resembling a worm
C. Coiled like a spring
D. Thread-like with a spiral shape
Correct answer: B
RATIONALE: "Vermiform" literally means worm-shaped . This term
describes the slender, cylindrical, elongated shape characteristic of most nematodes
in their mobile stages, distinguishing them from the swollen, sedentary stages of
some species.
