1|Page
IOWA 3OT PESTICIDE MANUAL EXAM|
COMPREHENSIVE Q&A FOR
CERTIFICATION SUCCESS 2026
Trunk injection - correct-answer - Placed at or inside cambium layer
Movement of the chemical into the tree occurs in the xylem
Rotary spreader - correct-answer - Widely used in apply granular products to
residential turfgrass properties
Define point of runoff - correct-answer - Sprayed to the point that some excess
spray liquid begins to drip to the ground
Re-entry interval - correct-answer - listed on product label about when it is safe
to be in area, or when spray has dried.
,2|Page
List three leaf arrangements on ornamental plants - correct-answer - Alternate -
leaf occurs singly per plant node and the leaves alternate sides along the stem
Opposite - having leaves arise from the same node, on opposite sides of the stem
Whorled - where three or more leaves, petals, or other place organs arise from
the same node
Ornamental plant - correct-answer - one that is grown for the purpose of adding
to or improving the beauty of a landscape site.
Identifying plant material - correct-answer - Plant form and size
Foliage character - deciduous or evergreen
,3|Page
Leaf, bud, or branch arrangement
Alternate
Opposite
Whorled
Type of leaf - simple, compound
Leaf margin - entire, toothed, lobed, etc
Leaf shape - oval, round, linear, etc
Twig characteristics - plain, thorns, etc
Bark characteristics - smooth, plated, diamond patterned, etc
Outline the factors involved in matching a plant to the site - correct-answer -
"The right plant in the right site"
Plant hardiness
, 4|Page
Plant is hardy if it can tolerate the lowest average winter temperatures occurring
in a specific zone.
Most of Iowa is zoned in 5a, some 5b in south and NW is 4b.
Environmental microclimates
Conditions in their immediate vicinity
Under eaves of buildings, south side of building, hilltop, under tree, etc.
Soil moisture and drainage
Amount of moisture a site receives and the speed by which the moisture drains
from the site.
Frequent heavy rain, slow drainage reduces oxygen levels for roots, etc
Soil pH
pH is the relative concentration of hydrogen ions and hydroxide ions in the soil
Availability of plant nutrients in soil is affected by soil pH.
Most soils in iowa have pH between 5.5 - 7.5
Woody ornamentals grow best at pH 6-7
Bedding plants from 5.5 - 6.5
IOWA 3OT PESTICIDE MANUAL EXAM|
COMPREHENSIVE Q&A FOR
CERTIFICATION SUCCESS 2026
Trunk injection - correct-answer - Placed at or inside cambium layer
Movement of the chemical into the tree occurs in the xylem
Rotary spreader - correct-answer - Widely used in apply granular products to
residential turfgrass properties
Define point of runoff - correct-answer - Sprayed to the point that some excess
spray liquid begins to drip to the ground
Re-entry interval - correct-answer - listed on product label about when it is safe
to be in area, or when spray has dried.
,2|Page
List three leaf arrangements on ornamental plants - correct-answer - Alternate -
leaf occurs singly per plant node and the leaves alternate sides along the stem
Opposite - having leaves arise from the same node, on opposite sides of the stem
Whorled - where three or more leaves, petals, or other place organs arise from
the same node
Ornamental plant - correct-answer - one that is grown for the purpose of adding
to or improving the beauty of a landscape site.
Identifying plant material - correct-answer - Plant form and size
Foliage character - deciduous or evergreen
,3|Page
Leaf, bud, or branch arrangement
Alternate
Opposite
Whorled
Type of leaf - simple, compound
Leaf margin - entire, toothed, lobed, etc
Leaf shape - oval, round, linear, etc
Twig characteristics - plain, thorns, etc
Bark characteristics - smooth, plated, diamond patterned, etc
Outline the factors involved in matching a plant to the site - correct-answer -
"The right plant in the right site"
Plant hardiness
, 4|Page
Plant is hardy if it can tolerate the lowest average winter temperatures occurring
in a specific zone.
Most of Iowa is zoned in 5a, some 5b in south and NW is 4b.
Environmental microclimates
Conditions in their immediate vicinity
Under eaves of buildings, south side of building, hilltop, under tree, etc.
Soil moisture and drainage
Amount of moisture a site receives and the speed by which the moisture drains
from the site.
Frequent heavy rain, slow drainage reduces oxygen levels for roots, etc
Soil pH
pH is the relative concentration of hydrogen ions and hydroxide ions in the soil
Availability of plant nutrients in soil is affected by soil pH.
Most soils in iowa have pH between 5.5 - 7.5
Woody ornamentals grow best at pH 6-7
Bedding plants from 5.5 - 6.5
