CORE Test Flashcards
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
vertebrates
What is groundwater and why is it important?
Water located beneath the earths surface, usually in rock and soil. this water is used in wells and household irrigation
Explain how the solubility, adsorption, and persistence of a pesticide affect its ability to move offsite in water
-solubility- some pesticides dissolve easily in water
-adsorption- some pesticides become tightly attached to soil particles. they will move with eroded soil.
-persistence- some pesticides break down slowly and remain in the environment for a long time.
what weather factors influence pesticide drift?
strong winds or gusts
low RH
high temps
temp inversions
what application factors influence pesticide drift?
droplet or particle size
height and direction of release
both determined by applicator decisions
How can volatility contribute to drift?
in vapor form, a pesticide can move great distances and injure sensitive plants and animals. volatility may also contribute to illegal residues
Which factors influence whether a pesticide will drift?
the weight and density of dry particle applied
whether adjuvants were used in liquid sprays
whether the pesticide tends to form vapors
How do illegal pesticide residues often occur?
too much pesticide is applied
the PHI is ignored
move off site and contaminate plants or animals nearby
sprayed off-labeled, on a site not permitted by the label
List three ways in which pesticides can move off site.
- in air- wind or air currents
- water- runoff or leaching
- objects- soil, plants, animals, humans
What is the difference between ‘point source’ and a ‘nonpoint source’ pesticide pollution?
Point source pollution comes from a specific identifiable place or point. ex. a pesticide spill that moves into a storm drain.
Nonpoint source pollution comes from a wider area. ex. the movement of pesticides into streams after a broadcast application.
What are sensitive areas that need extra protection from pesticides?
sites or living things within an environment that re vulnerable to pesticide injury. ex..
1. places where pesticide might get into ground or surface water
2. near homes, schools, playgrounds, hospitals, and other public areas
3. animals- endangered species, bees, wildlife, livestock and pets.
4. food or feed is stored
Sites or living things within an environment that re vulnerable to pesticide injury. ex..
- places where pesticide might get into ground or surface water
- near homes, schools, playgrounds, hospitals, and other public areas
- animals- endangered species, bees, wildlife, livestock and pets.
- food or feed is stored
What is the difference between a surfactant and an adjuvant?
an adjuvant is a chemical that affects how a pesticide works. it can be any substance added to modify properties of a pesticide formulation.
a surfactant is a specific kind of adjuvant. it affects the dispersing, spreading, or wetting properties of spray droplets.
What concentration of active ingredient would you expect to find in the label : Alpha 40 WP?
40% ai
How do you know if 2 pesticides can be safely tank mixed?
Read the label. if not in the label, mix a small amount in a jar and look for incompatibility signs
Why must pesticides be compatible if they are tank mixed?
because a mixture that is not compatible may be unusable, unsafe, or ineffective. incompatibility occurs when one component within a tank mix reacts with or adversely affects another.
What are fumigants? Why are they dangerous?
Pesticides that form poisonous gasses when applied. They are toxic to a wide range of pests and can be used at many different sites. They are highly toxic to humans and all other organisms. High inhalation exposure risk
what is the general term for a pesticide AI formulated with food or another attractive substance?
Bait
what is the term for a wettable powder formulation that has been compressed into granule-sized particles?
Dry flowable (DF) or water-dispersible granule (WDG)
Name at least 2 disadvantages of Wettable Powders?
- not easy to measure
- inhalation hazard to applicator while mixing and measuring
wettable powders are widely used pesticide formulations. why? many advantages:
- effective for most pest problems and in most types of spray equipment
- excellent residual activity
- easy to store, transport, and handle
- less likely than ECs to harm treated plants/animals
- usually not phytotoxic
- pose less risk of skin and eye absorption
Which dry formulation consists of particles that are more or less uniform in size, shape, and weight?
Pellet
name at least one advantage and one disadvantage of concentrate solution (C, LC, or WSC/WSL) formulations.
adv: do not clog hoses or nozzles
dis: easily absorbed through skin
name at least one advantage and one disadvantage of ready-to-use (RTU) formulations.
adv: convenience- no measuring or pouring
dis: high cost/unit of ai
name at least one advantage and one disadvantage of emulsifiable concentrate (EC) formulations.
adv: little agitation required
dis: may damage treated plants/animals
name at least one advantage and one disadvantage of granule (G) and pellet (P) formulations.
adv: low drift hazard bc of large particle size
dis: uniform application hard to achieve
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
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.