VIRGINIA COMMERCIAL PESTICIDE APPLICATORS CORE EXAM / STUDY GUIDE LATEST VERSION 2025-2026 / QUESTIONS AND
CORRECT ANSWERS|A+
Explain the difference between key pests, occasional pests and secondary pests ✔️Key pests are nearly
always present and require regular control. occasional pests are migratory or cyclical and require
intermittent control. secondary pests require control only under certain conditions, such as the
elimination of a key pest or the absence of a natural host.
what should you do first if you see damage to a plant, animal, or valuable product/ ✔️identify the cause
what should you do first if you discover a pest that may need to be controlled? ✔️make sure the pest is
actually responsible for the damage. then accurately identify the pest
how can pest identification help you develop a good pest control strategy? ✔️it allows you to determine
basic information about the pest, including its life-cycle and when it is most susceptible to control
measures.
name the 5 basic pest groups ✔️weeds, parasites and diseases, mollusks, arthropods, and vertebrates.
why do weeds present such a challenge to pest managers? ✔️weeds are often hardy, aggressive, and
tolerant of harsh conditions. many produce large numbers of seeds which can spread over a wide area
and remain dormant for a long time.
how can you tell a monocot from a dicot? ✔️monocots (sedges and grasses) have one cotyledon, parallel
leaf veins, flower parts in multiples of 3 and fibrous roots. Dicots have 2 cotyledons, broad leaves with
netted veination, and flower parts in multiples of 4 and 5 and usually have taproots.
name the pathogens that cause most plant and animal diseases ✔️fungi, bacteria, mycoplasma, and
viruses
what are the symptoms of viral plant diseases ✔️stunting, yellow rings on leaves, wilting, and mosaic
patterns
how do plant parasitic nematodes harm plants? ✔️by attacking the roots, stems and leaves. nematode
root feeding interferes with a plants ability to take up water and nutrients. infected plants wilt and seem
to be suffering from a lack of water or nutrients.
how do mollusks harm plants? ✔️by feeding on foliage and fruit. mollusks reduce the value of
commercial produce if they feed on harvested plants and fruit.
what are arthropods? how do they differ from vertebrates? ✔️arthropods are animals with segmented
bodies and jointed appendages. Arthropods have an external skeleton and may have specialized
appendages such as sucking tubes, chewing mouth parts, antennae, and pincers. they have no
backbones like vertebrates
what is the difference between gradual and complete metamorphosis? why is it important to know the
life cycle stage of an insect? ✔️gradual metamorphosis includes 3 stages: egg, nymph and adult. there is
no pupa stage. complete metamorphosis includes 4 stages: egg, larva, pupa, and adult. insects that
, develop via complete metamorphosis change body form. larvae may not look at all like adults within the
same species.it is very important to recognize the damaging stage for best treatment results. many
insect are pests in one stage but not another. especially larval form.
what are beneficial insects? and why are they important to agriculture? ✔️insects that are pollinators
(bees and butterflies) or pest predators (ladybeetles and lacewings). with out pollinators many types of
plants could not reproduce and beneficial predators feed on harmful insects, mites, and weeds.
how do mites harm plants? ✔️They suck the plant juices, eat the underside of leaves, and disfigure the
plants they feed on.
what is an economic threshold? ✔️the level at which economic losses caused by pest damage, if the pest
population continued to grow, would be greater than the cost of controlling the pests. reaching an
economic threshold usually prompts some kind of pest control action.
how are thresholds important to a sound pest control strategy? ✔️setting a treatment or action
threshold is essential to prevent the pests in an area from causing unacceptable injury or harm. action
thresholds vary: sometimes one pest is too many (like a rat in a food processing facility). Thresholds help
producers and applicators weigh the cost of pest control against the cost of a pest infestation
what is monitoring and how is it important to a sound pest control strategy? ✔️regular checking or
scouting for pests in a designated area. Monitoring will tell you what pests are in an area, how many are
in the area, and how much damage they are causing. it will help determine if the pest population has
reached the treatment threshold and whether control measures have worked.
what is the difference between prevention, suppression and eradication of a pest? ✔️prevention means
reducing the chances that a pest will become a problem. suppression means reducing pest numbers or
damage to an acceptable level. Eradication means destroying an entire pest population.
how could you prevent a pest infestation? ✔️plant weed- and disease- free seed, choose plants resistant
to diseases and insects, and practice good sanitation. other preventative techniques include excluding
pests from the target area and using pre-emergent herbicides to kill weed seeds.
briefly define IPM ✔️Integrated Pest Management is an ecological approach to pest control. it is based
on the habitat and life-cycle of the pest. IPM combines chemical and nonchemical methods into a single
plan or strategy. the goal of an IPM program is to reduce pest populations to an acceptable level in a
way that is practical, cost-effective, and safe for the environment as well as human health.
Give several reasons to use IPM rather than using only a pesticide. ✔️IPM programs:
1. often ensure better success at the treatment site
2. promote a more balanced ecosystem and are more environmentally friendly
3. are less likely to lead to pesticide resistance and secondary pest outbreaks
4. may reduce pesticide use and can help protect beneficial insects
CORRECT ANSWERS|A+
Explain the difference between key pests, occasional pests and secondary pests ✔️Key pests are nearly
always present and require regular control. occasional pests are migratory or cyclical and require
intermittent control. secondary pests require control only under certain conditions, such as the
elimination of a key pest or the absence of a natural host.
what should you do first if you see damage to a plant, animal, or valuable product/ ✔️identify the cause
what should you do first if you discover a pest that may need to be controlled? ✔️make sure the pest is
actually responsible for the damage. then accurately identify the pest
how can pest identification help you develop a good pest control strategy? ✔️it allows you to determine
basic information about the pest, including its life-cycle and when it is most susceptible to control
measures.
name the 5 basic pest groups ✔️weeds, parasites and diseases, mollusks, arthropods, and vertebrates.
why do weeds present such a challenge to pest managers? ✔️weeds are often hardy, aggressive, and
tolerant of harsh conditions. many produce large numbers of seeds which can spread over a wide area
and remain dormant for a long time.
how can you tell a monocot from a dicot? ✔️monocots (sedges and grasses) have one cotyledon, parallel
leaf veins, flower parts in multiples of 3 and fibrous roots. Dicots have 2 cotyledons, broad leaves with
netted veination, and flower parts in multiples of 4 and 5 and usually have taproots.
name the pathogens that cause most plant and animal diseases ✔️fungi, bacteria, mycoplasma, and
viruses
what are the symptoms of viral plant diseases ✔️stunting, yellow rings on leaves, wilting, and mosaic
patterns
how do plant parasitic nematodes harm plants? ✔️by attacking the roots, stems and leaves. nematode
root feeding interferes with a plants ability to take up water and nutrients. infected plants wilt and seem
to be suffering from a lack of water or nutrients.
how do mollusks harm plants? ✔️by feeding on foliage and fruit. mollusks reduce the value of
commercial produce if they feed on harvested plants and fruit.
what are arthropods? how do they differ from vertebrates? ✔️arthropods are animals with segmented
bodies and jointed appendages. Arthropods have an external skeleton and may have specialized
appendages such as sucking tubes, chewing mouth parts, antennae, and pincers. they have no
backbones like vertebrates
what is the difference between gradual and complete metamorphosis? why is it important to know the
life cycle stage of an insect? ✔️gradual metamorphosis includes 3 stages: egg, nymph and adult. there is
no pupa stage. complete metamorphosis includes 4 stages: egg, larva, pupa, and adult. insects that
, develop via complete metamorphosis change body form. larvae may not look at all like adults within the
same species.it is very important to recognize the damaging stage for best treatment results. many
insect are pests in one stage but not another. especially larval form.
what are beneficial insects? and why are they important to agriculture? ✔️insects that are pollinators
(bees and butterflies) or pest predators (ladybeetles and lacewings). with out pollinators many types of
plants could not reproduce and beneficial predators feed on harmful insects, mites, and weeds.
how do mites harm plants? ✔️They suck the plant juices, eat the underside of leaves, and disfigure the
plants they feed on.
what is an economic threshold? ✔️the level at which economic losses caused by pest damage, if the pest
population continued to grow, would be greater than the cost of controlling the pests. reaching an
economic threshold usually prompts some kind of pest control action.
how are thresholds important to a sound pest control strategy? ✔️setting a treatment or action
threshold is essential to prevent the pests in an area from causing unacceptable injury or harm. action
thresholds vary: sometimes one pest is too many (like a rat in a food processing facility). Thresholds help
producers and applicators weigh the cost of pest control against the cost of a pest infestation
what is monitoring and how is it important to a sound pest control strategy? ✔️regular checking or
scouting for pests in a designated area. Monitoring will tell you what pests are in an area, how many are
in the area, and how much damage they are causing. it will help determine if the pest population has
reached the treatment threshold and whether control measures have worked.
what is the difference between prevention, suppression and eradication of a pest? ✔️prevention means
reducing the chances that a pest will become a problem. suppression means reducing pest numbers or
damage to an acceptable level. Eradication means destroying an entire pest population.
how could you prevent a pest infestation? ✔️plant weed- and disease- free seed, choose plants resistant
to diseases and insects, and practice good sanitation. other preventative techniques include excluding
pests from the target area and using pre-emergent herbicides to kill weed seeds.
briefly define IPM ✔️Integrated Pest Management is an ecological approach to pest control. it is based
on the habitat and life-cycle of the pest. IPM combines chemical and nonchemical methods into a single
plan or strategy. the goal of an IPM program is to reduce pest populations to an acceptable level in a
way that is practical, cost-effective, and safe for the environment as well as human health.
Give several reasons to use IPM rather than using only a pesticide. ✔️IPM programs:
1. often ensure better success at the treatment site
2. promote a more balanced ecosystem and are more environmentally friendly
3. are less likely to lead to pesticide resistance and secondary pest outbreaks
4. may reduce pesticide use and can help protect beneficial insects
