M1162
2003
Insecticide Suggestions to Manage Landscape Tree
and Shrub Insects
Vera
Krischik
Associate Professor
Department of Entomology
Jeffrey D. Hahn
Extension Educator, Entomology
Department of Entomology
© 2003 Regents of the University of Minnesota. All rights reserved.
How To Use This Publication |
This publication provides information on timing insecticides and
insecticide choices. However, it is the responsibility of the applicator
to determine the appropriateness, correct timing, and safety requirements
of a chemical application.
We encourage applicators to manage pests using integrated pest
management (IPM) techniques. Before spraying pesticides, use economical
and effective nonchemical methods such as cultural, mechanical,
and biological control. Important goals in IPM are to properly
time pesticide application to the vulnerable stage of the pest,
use biorational pesticides that conserve beneficial insects, and
minimize plant damage. Integrated pest management utilizes insect
identification, knowledge of the pest insect's life cycle, monitoring
techniques, timing insecticide application to the pest's most vulnerable
stage, choosing the most appropriate pesticide, and monitoring
after application.
Information on application times and dates are based on an average
season; adjust timing of treatments when an early or late season
is encountered. Seasonal dates apply to central Minnesota, including
the Twin Cities. Expect pests approximately 7 days earlier for
southern Minnesota and approximately 7–10 days later for northern
Minnesota. It is the responsibility of the applicator to ensure
the target pest is present before applying pesticides.
Follow all label directions carefully. Be sure the pesticide is
labeled for the target site and/or plant that is intended to be
treated. The availability and recommended use of specific pesticides
changes over time. If suggestions in this publication differ from
recommended uses on a label, the label is the final authority on
how you may
legally use that pesticide. It is up to the applicator to ensure
pesticides are mixed, applied, and stored properly.
Pesticides are listed by common chemical name, professional product
name, and consumer product name. Use of trade names does not imply
endorsement. See the reference list at the end of the publication
for other publications with more detailed information on specific
pests.
Recently, several commonly used insecticides for the control of
insects on woody landscape plants were removed from sale. EPA is
phasing out the use of chlorinated hydrocarbons, organophosphates
and carbamates due to safety concerns. Registration changes include:
- acephate (under review)
- bendiocarb (cancelled)
- chlorpyrifos (only for nursery production,
golf courses, and road medians)
- diazinon (cancelled)
- dimethoate
(cancelled)
- dicofol (for non-residential, nursery use only)
- endosulfan
(cancelled)
- lindane (cancelled)
A pesticide name in Bold indicates a professional
product requiring a MN Pesticide Certification and License.
Pest |
Hosts |
Pesticide |
Remarks |
Aphids: leaf sucking, Family Aphididae,
Order Homoptera |
aphids: leaf sucking, exposed |
all trees and shrubs |
- acephate
- azadirachtin
- bifenthrin
- chlorpyrifos (nursery only)
- cyfluthrin
- deltamethrin
- disulfoton
- esfenvalerate
- fluvalinate
- imidacloprid
- insecticidal soap
- lambda cyhalothrin
- malathion
- oil, summer spray
- oil, dormant
- permethrin
- pymetrozine
- pyrethrins
- pyriproxyfen
|
Treat when aphids are numerous. Watch for evidence of aphid
natural enemies (e.g. lady beetles and parasitic wasps). Insecticide
treatments may not be necessary when natural enemies are abundant. |
|
Pest |
Hosts |
Pesticide |
Remarks |
Aphids: leaf curling, Family Aphididae,
Order Homoptera |
viburnum leaf curl aphid |
ash, elm, viburnum and others |
- acephate (systemic insecticide)
- imidacloprid*
(systemic insecticide)
- Inject/drench into soil when
damage is first noticed, usually in spring.
- cyfluthrin
|
Spray foliage when damage is first noticed,
usually in spring. |
honeysuckle witches' broom aphid |
Tartarian, Zabel, and other susceptible
varieties of honeysuckle |
- acephate (systemic insecticide)
- imidacloprid* (systemic insecticide)
- Inject/drench into soil when damage is first noticed,
usually in spring.
- cyfluthrin
|
Spray foliage when damage is first noticed,
usually in spring. |
|
Pest |
Hosts |
Pesticide |
Remarks |
Aphids: woolly, Family Aphididae,
Order Homoptera |
aphids: leaf sucking,
woolly, exposed on branch/trunk
woolly alder aphid
woolly apple aphid
|
alder, silver maple, elm, apple, hawthorne,
mountain ash
|
- systemic insecticides
- acephate
- cyfluthrin
- imidacloprid*
- Inject/drench into soil when damage is first noticed,
usually in spring.
|
Spray foliage when damage is first noticed
in spring. |
Pest |
Hosts |
Pesticide |
Remarks |
Adelgid: Woolly (family Adelgidae,
order Homoptera) |
hemlock woolly adelgid*
|
hemlock |
|
The woolly wax reduces the
efectiveness of contact insecticides. Systemic insecticides
are the best choice. Use a soil drench or foliar spray of
imidacloprid. |
|
pine bark
adelgid
|
White, Austrian, Scotch pine
|
- dormant oil
- carbaryl
- chlorpyrifos (nursery only)
|
Improve health of tree, primarily through
watering. The woolly wax reduces the effectiveness
of contact insecticides. Spray bark of trunk and limbs 3
times. Dormant oil sprays (3-5%) are quite effective if applied
in the fall
or spring
to kill
the overwintering
nymphs before the females have begun to produce eggs in the
waxy coating. Insecticides applied in mid-April will kill
the overwintering nymphs before they mature and lay eggs.
Summer sprays are effective but two to three sprays, at weekly
intervals, will be needed to kill new crawlers hatching from
eggs. |
|
Pest |
Hosts |
Pesticide |
Remarks |
Borers: bark beetles, Family Scolytidae,
Order Coleoptera |
ambrosia beetle
|
red maples, oak, and many others |
- chlorpyrifos (nursery only)
- permethrin
|
Single female galleries in pruning wounds,
can vector pathogenic fungus |
|
European elm bark beetle
native elm bark
beetle
|
elms
|
- chlorpyrifos (nursery only)
- permethrin
|
Control native elm bark beetle
at overwintering sites at the base of healthy elm trees in
fall. The injection of systemic fungicides on a preventative
basis, or to cure infected elms showing early stages of disease
(less than 5-10% of crown symptoms). Alamo and Arbotect 20-S
are trade names of two systemic fungicides that are generally
effective for 2 to 3 years, but must be applied by licensed
arborists. |
|
pine bark beetle
|
pines
|
- chlorpyrifos (nursery only)
- permethrin
|
|
|
Pest |
Hosts |
Pesticide |
Remarks |
Borers: clearwing borers, Family Sessidae,
Order Lepidoptera |
lilac/ash clearwing borer
|
lilac, privet, most ash |
- chlorpyrifos (nursery only)
- permethrin
|
Spray on bark of trunk and
limbs during adult egg laying, mid-May to June. Base timing
on pheromone trap catches (available commercially). |
|
banded ash clearwing borer
|
lilac, privet, most ash
|
- chlorpyrifos (nursery only)
- permethrin
|
Spray on bark of trunk and limbs during
adult egg laying, August. Base timing on pheromone trap catches
(available commercially). |
|
viburnum borer
|
viburnum
|
- chlorpyrifos (nursery only)
- permethrin
|
Spray on bark of trunk and limbs during
adult egg laying late June and July. Base timing on pheromone
trap catches (available commercially). |
|
Pest |
Hosts |
Pesticide |
Remarks |
Borers: flat headed borers, Family
Buprestidae, Order Coleoptera |
bronze birch borer
|
birch (esp. paper, European
white, and gray birch) |
- chlorpyrifos (nursery only)
- permethrin
- imidacloprid
|
Improve health of birch,
primarily through adequate watering. Spray bark of trunk
and limbs 3 times. |
|
emerald ash borer*
*Not established in Minnesota as of 2003 |
ash |
- chlorpyrifos (nursery only)
- permethrin
- imidacloprid
|
Quarantine pest; report to MDA. |
|
flat headed apple tree borer
|
flowering fruits, rose, cotoneaster,
maple, oak, willow
|
- chlorpyrifos (nursery only)
- permethrin
- imidacloprid
|
Improve health of tree, primarily through
watering. Spraying bark of trunk and limbs 3 times. |
|
twolined chestnut borer
|
oak |
- chlorpyrifos (nursery only)
- permethrin
- imidacloprid
|
Improve health of tree, primarily through
watering. Spraying bark of trunk and limbs 3 times. |
|
Pest |
Hosts |
Pesticide |
Remarks |
Borers: round headed borers, Family
Cerambycidae, Order Coleoptera |
Asian long horn beetle*
*Not established in Minnesota as of 2003 |
|
- chlorpyrifos (nursery only)
- permethrin
|
Quarantine pest; report to
MDA. |
|
elm borer
|
|
- chlorpyrifos (nursery only)
- permethrin
|
Improve health of tree, primarily through
watering. Spraying bark of trunk and limbs 3 times. |
|
locust borer
|
|
- chlorpyrifos (nursery only)
- permethrin
|
Improve health of tree, primarily through
watering. Spraying bark of trunk and limbs 3 times. |
|
whitespotted sawyer
|
|
- chlorpyrifos (nursery only)
- permethrin
|
Improve health of tree, primarily through
watering. Spraying bark of trunk and limbs 3 times. If beetle
vectored nematode, then insecticide applications will do
no good. |
|
Pest |
Hosts |
Pesticide |
Remarks |
Caterpillars: leaf feeding, many Families,
Order Lepidoptera |
caterpillars
|
virtually all trees and shrubs |
- acephate
- Bacillus thuringiensis var. kurstaki
- bifenthrin
- carbaryl
- chlorpyrifos (nursery only)
- cyfluthrin
- deltamethrin
- esfenvalerate
- fluvalinate
- insecticidal soap
- lambda cyhalothrin
- malathion
- permethrin
- pyrethrins
- spinosad
- diflubenzuron
|
Spray leaves when caterpillars
are small and before leaf damage is extensive. |
|
cankerworm (spring and fall)
|
apple, ash, basswood boxelder, cherry,
elm, maple, and others |
- as above (for caterpillars)
|
Late April to mid-May (at time of leaf
expansion).Spray leaves when caterpillars are small and before
leaf damage is extensive. |
|
Eastern tent caterpillar
|
wild cherry, apple, crabapple, plum,
pear, and others |
- as above (for caterpillars)
|
First active mid- to late May. Spray
foliage when tents first appear, early to mid-May. Use Bacillus
thuringiensis var. kurstaki when trees are flowering to protect
pollinating bees. |
|
fall webworm
|
apple, birch, black walnut, boxelder,
elm, oak, willow, and many others |
- as above (for caterpillars)
|
Spray foliage when caterpillars are young,
July to early August, but before webs are spun. Control is
not effective once caterpillars are enclosed |
|
forest tent caterpillar
|
aspen, birch, oak, basswood, ash, maple,
elm, and others
|
- as above (for caterpillars)
|
First active mid- to late May. |
|
gypsy moth*
*Not established in Minnesota as of 2003 |
oaks, most trees and shrubs
|
- as above (for caterpillars)
- diflubenzeuron
- pheromone flakes
|
Quarantine pest; report to MDA. Larvae:
May
Adults: August
Eggs: September
|
|
red humped caterpillar
|
birch, dogwood, elm, apple, and many
others
|
- as above (for caterpillars)
|
First active August to September.
|
|
spiny elm caterpillar
|
elm, willow, and others
|
- as above (for caterpillars)
|
First active late May to early June
|
|
spruce budworm
|
balsam fir, spruce
|
- as above (for caterpillars)
|
First active mid- to late May
|
|
walnut caterpillar
|
butternut, hickory, walnut, and others
|
- as above (for caterpillars)
|
First active July to September.
|
|
white marked tussock moth
|
apple, basswood, elm, poplar, and others
|
- as above (for caterpillars)
|
First active mid- to late May, second
generation first active in August.
|
|
yellow necked caterpillar
|
crabapple, maple, oak, elm, and many
others
|
- as above (for caterpillars)
|
First active August to September.
|
|
Pest |
Hosts |
Pesticide |
Remarks |
Caterpillars: stem boring, many Families,
Order Lepidoptera |
European pine shoot moth
|
Scot's, red, and Austrian
pine |
- as above (for caterpillars)
|
Spray ends of branches thoroughly
in mid-April or late June to early July. |
|
Zimmerman pine moth
|
pine, especially Scot's, white, and Austrian |
- as above (for caterpillars)
- permethrin
|
Spray bark of main stem, especially areas
with exuding pitch, once in mid-April. Prune and destroy
infected limbs. Remove pitch masses by August. Can also spray
in August, although spring application is most effective. |
|
Pest |
Hosts |
Pesticide |
Remarks |
Caterpillars: leaf-feeding and case
bearing, many Families, Order Lepidoptera |
bagworm*
*Not established in Minnesota as of 2003 |
arborvitae, junipers |
- as above (for caterpillars)
|
Spray when bags are small. |
|
elm case bearer
|
American elm, Siberian and
other elms
|
- as above (for caterpillars)
|
Spray when bags are small. |
|
larch casebearer
|
all larch species |
- as above (for caterpillars)
|
Spray as larch foliage appears in May
and overwintering larvae begin feeding or in mid-July to
August when young larvae begin mining needles. |
|
Pest |
Hosts |
Pesticide |
Remarks |
Galls: adelgid, Family Adelgidae, Order
Homoptera |
Galls
(induced by adelgids, cynipid wasps, eriophyid mites, gall
midges, psyllids)
|
most trees and shrubs; found
on leaves, twigs, stems, flowers, buds, and petioles |
|
Control rarely is necessary
to protect plant health. Once galls are seen, control is
not effective for the current year. Identify the insect or
mite and use the suggestions below as a guide. |
|
Cooley spruce gall adelgid
|
Colorado blue and white spruce |
- carbaryl
- bifenthrin
- chlorpyrifos (nursery only)
- cyfluthrin
- deltamethrin
- fluvalinate
- imidacloprid
|
Spray spruce as buds swell in early April
before galls begin to form or in September to kill over wintering
adelgids. |
|
Eastern spruce gall adelgid
|
Norway, white, and other spruce |
- carbaryl
- bifenthrin
- chlorpyrifos (nursery only)
- cyfluthrin
- deltamethrin
- fluvalinate
- imidacloprid
|
Spray spruce as buds swell in early April
before galls begin to form or in late August to early September. |
|
Pest |
Hosts |
Pesticide |
Remarks |
Cynipid Galls: Family Cynipidae,
Order Hymenoptera |
cynipid wasp oak gall
oak bullet gall
oak rolly polly gall
jumping oak gall
mossy rose gall
spiny rose gall
|
oak |
|
Spray from 1/2 to 3/4 leaf
expansion. |
|
Pest |
Hosts |
Pesticide |
Remarks |
Galls: psyllids, Family Psyllidae,
Order Homoptera |
hackberry nipple and blister
galls
|
oak |
- carbaryl
- cyfluthrin
- bifenthrin
|
Spray from 1/2 to 3/4 leaf
expansion. |
|
Pest |
Hosts |
Pesticide |
Remarks |
Galls: eriophyid mites can be vagrant
(free roaming) or make galls (erineum galls, finger galls,
bladder
galls, ash flower gall), Family Eriophyidae, Order Acari |
maple spindle gall
maple
velvet erineum gall
viburnum erineum gall
birch erineum gall
|
maple
maple
viburnum
birch
|
|
Spray at or just prior to
bud break. |
|
ash flower gall (eriophyid mite)
|
ash
|
|
Spray just prior to flower bud break
in spring. |
|
Pest |
Hosts |
Pesticide |
Remarks |
Galls: fly, Family Cecidomyiidae, Family
Tephrytidae, Order Diptera |
tephrytid stem gall/
cecidomyiid stem gall
|
many |
|
Spray from 1/2 to 3/4 leaf
expansion. |
|
Pest |
Hosts |
Pesticide |
Remarks |
Leaf Beetle: leaf chewing, Family Chrysomelidae,
Order Coleoptera |
elm leaf beetle
|
American elm, Siberian and
other elms
|
- acephate
- azadirachtin
- Beauveria bassiana
- Bacillus thuringiensis
var tenebrionis
- bifenthrin
- carbaryl
- chlorpyrifos (nursery only)
- cyfluthrin
- deltamethrin
- fluvalinate
- horticultural oil
- insecticidal soap
- imidacloprid
- lambda cyhalothrin
- permethrin
- spinosad
|
Monitor for adult beetles
in May; spray when larvae first appear. Two generations occur
a year. The second generation is less damaging and less important
to control. |
|
cottonwood leaf beetle
|
poplar, willow |
- as above (for leaf beetles)
|
Monitor for adult beetles in May; spray
when larvae first appear. Two generations occur a year. The
second generation is less damaging and less important to
control. |
|
ninebark beetle
|
Diablo, Dart's Gold, American ninebark |
- as above (for leaf beetles)
|
Monitor for adult beetles in May; spray
when larvae first appear. Two generations occur a year. The
second generation is less damaging and less important to
control. |
|
viburnum leaf beetle*
*Not established in Minnesota as of 2003 |
viburnum |
- as above (for leaf beetles)
|
Monitor for adult beetles in May; spray
when larvae first appear. One generation occur a year. |
|
imported willow leaf beetle
|
willow, poplar, cottonwood |
- as above (for leaf beetles)
|
Monitor for adult beetles in May; spray
when larvae first appear. Two generations occur a year. The
second generation is less damaging and less important to
control. |
|
Pest |
Hosts |
Pesticide |
Remarks |
Scarab beetle: leaf chewing, Family
Scarabeidae, Order Coleoptera |
Japanese beetle
|
grapes, rose, many other
plants |
- acephate
- bifenthrin
- carbaryl
- chlorpyrifos (nursery only)
- cyfluthrin
- deltamethrin
- imidacloprid
- lambda cyhalothrin
- malathion
- permethrin
|
Monitor for adult beetles
in June and July. |
|
May/June/Phyllophaga beetles
|
oak, grapes, lindens, Norway maple, cottonwood,
many other plants |
- as above (for Japanese beetles)
|
Monitor for adult beetles in June and
July. |
|
Pest |
Hosts |
Pesticide |
Remarks |
Leafminers: leaf mining, Famiy Tentridinidae,
Order Hymeoptera |
birch leafminer
|
gray, paper, and other birch |
- acephate
- bifenthrin
- carbaryl
- chlorpyrifos (nursery only)
- cyfluthrin
- deltamethrin
- disulfoton
- can be used when damage
is first noticed.
- fenoxycarb
- fluvalinate
- lambda cyhalothrin
- permethrin
- imidacloprid*
- Inject or drench into the soil
once. Need to anticipate problem
and apply the previous fall
|
Spray foliage thoroughly
when mines first appear, about mid-May. A second generation
occurs in early June, although treatment is rarely necessary. |
|
elm leaf miner
|
Siberian elm and American elm |
- as above (for birch leafminer)
|
Spray foliage thoroughly when mines first
appear, late April to early May. |
|
Pest |
Hosts |
Pesticide |
Remarks |
Leafhopper: leaf sucking, Family
Cicadellidae, Order Homoptera |
potato leafhopper
|
moves from potato, alfalfa,
grasses to red maples |
- as above (for leaf miner)
|
Spray foliage, especially
underside, when bugs are numerous, normally in July and August |
|
Pest |
Hosts |
Pesticide |
Remarks |
lace bug: leaf sucking, Family Tingidae, Order
Homoptera |
azalea lace bug* hawthorne
lace bug oak lace bug
*Not established in Minnesota as of 2003 |
white and bur oak, hackberry,
basswood,
chokecherry, juneberry, hawthorn, and others
|
- acephate,
- azadirachtin
- bifenthrin
- carbaryl
- chlorpyrifos (nursery only)
- cyfluthrin
- deltamethrin
- fluvalinate
- horticultural oil
- insecticidal soap
- imidacloprid
- lambda cyhalothrin
- malathion
- permethrin
- pyrethrins
|
Spray foliage, especially
underside, when bugs are numerous, normally in July and August |
|
Pest |
Hosts |
Pesticide |
Remarks |
Plant bugs: leaf sucking, Family Miridae
order Homoptera |
ash plant bug
|
most ash |
- acephate,
- azadirachtin
- bifenthrin
- carbaryl
- chlorpyrifos (nursery only)
- cyfluthrin
- deltamethrin
- fluvalinate
- horticultural oil
- insecticidal soap
- imidacloprid
- lambda cyhalothrin
- malathion
- permethrin
- pyrethrins
|
Damage is rarely extensive
enough to warrant control for health of tree. Spray when
bugs first appear on leaves, shortly after leaf expansion
in May. Two generations occur a year. |
|
fourlined plant bug
|
many plants, especially mints |
- as above (for ash plant bug)
|
Spray when bugs first appear on leaves,
shortly after leaf expansion in May. One generation occurs
a year. |
|
honeylocust plant bug
|
honeylocust |
- as above (for ash plant bug)
|
Spray when bugs first appear on leaves,
shortly after leaf expansion in May. One generation occurs
a year. |
|
Pest |
Hosts |
Pesticide |
Remarks |
Sawflies: leaf chewing, Family Diprionidae(conifer)
and Tenthredinidae (common), Order Hymenoptera |
sawflies
|
many trees and shrubs |
- acephate
- azadirachtin
- bifenthrin
- carbaryl
- chlorpyrifos (nursery only)
- cyfluthrin
- deltamethrin
- fluvalinate
- horticultural oil
- insecticidal
soap
- imidacloprid
- lambda cyhalothrin
- malathion
- permethrin
- pyrethrins
- spinosad
|
Spray foliage when larvae
are small (less than or equal to 1/2 full grown size) and
before damage is extensive. Limit treatments to areas of
plants where sawflies are feeding unless sawflies are widespread
throughout the plant. |
|
dogwood sawfly
|
dogwood, gray dogwood and other |
|
First active June to July. |
|
dusky birch sawfly
|
gray, paper, and other birch |
|
First active May. |
|
European pine sawfly
|
mugo, Scot's, and other pines |
|
First active early to late May. |
|
introduced pine
sawfly
|
white, and other pine |
|
First active late May to early June and
second generation. First active late July to early September. |
|
larch sawfly
|
all larch species |
|
First active early June to early July. |
|
mountain ash sawfly
|
American, European mountain ash |
|
First active June to early August. Second
generation first active late August to September. |
|
pear sawfly
|
fruit trees, hawthorn, mountain
ash, crabapple, cotoneaster, and others
|
|
First active early June. Second generation
first active early August. |
|
redheaded pine
sawfly
|
Jack, red, and other pine |
|
First active mid-June to early July. |
|
roseslug sawfly
|
most roses |
|
First active mid-May to mid-June. |
|
yellowheaded spruce sawfly
|
white, black and blue spruce |
|
First active early to mid-June. |
|
Pest |
Hosts |
Pesticide |
Remarks |
Sawflies: stem boring, Family Tenthredinidae,
Order Hymenoptera |
maple petiole borer
|
maple, esp. sugar maple |
|
No effective control available.
Control rarely is important to protect tree health. |
|
Pest |
Hosts |
Pesticide |
Remarks |
Scales: Family Coccidae (soft scales)
and Diaspididae (armored scales) |
scales
armored scale
(fecal material under shell, no honeydew, overwinter as female
or eggs under female cover)
soft scale
(produces honeydew,
overwinter as immature female)
|
any host |
- acephate
- bifenthrin
- carbaryl
- chlorpyrifos (nursery only)
- deltamethrin
- fluvalinate
- lambda cyhalothrin
- horticultural oil
- insecticidal
soap
- imidacloprid
(only for soft scales)
- malathion
- permethrin
- pyriproxyfen
|
Spray after crawlers have
hatched. Sample to determine hatch time. |
|
black pineleaf scale
(armored scale)
|
red, mugo, and jack pine, and Douglas
fir |
|
First active June to July. |
|
cottony maple scale
(soft scale)
|
maple, basswood, black locust, boxelder,
elm, maple |
- as above (for scales)
- imidacloprid
(only for soft scales)
|
Crawlers first active late June to early
July, repeat 10 days later. |
|
European elm scale
(felt scale)
|
American elm and other native elm |
- as above (for scales)
- imidacloprid
(only for soft scales)
|
Crawlers first active late June to July. |
|
lecanium scale
(soft scale)
|
many trees and shrubs |
- as above (for scales)
- imidacloprid
(only for soft scales)
|
Crawlers first active June to early July. |
|
oystershell scale
(armored scale)
|
apple, birch, ash, cotoneaster, elm,
lilac, and others |
|
Crawlers first active early June. |
|
pine needle scale
(armored scale)
|
pine, spruce |
|
Crawlers first active late May. |
|
pine tortoise scale
(soft scale)
|
Jack and Scot's pine |
- as above (for scales)
- imidacloprid
(only for soft scales)
|
Crawlers first active late June to early
July. |
|
scurfy scale
(armored scale)
|
elm, hackberry, maple, willow |
|
Crawlers first active late June to early
July. |
|
spruce bud scale
(soft scale)
|
spruce |
- as above (for scales)
- imidacloprid
(only for soft scales)
|
Crawlers first active mid-June to early
July. |
|
Pest |
Hosts |
Pesticide |
Remarks |
Spider Mites:Family Tetranychidae,
Order Acari |
spider mites
|
evergreens and some deciduous
trees |
Biorational pesticides:
- abamectin
- bifenazate
- clofentazine
- hexythiazox
- horticultural oil
- insecticidal soap
- pyradiben
Conventional pesticides:
- bifenthrin
- chlorpyrifos
(nursery only)
- deltamethrin
- dicofol
- fenbutatin-oxide
- fluvalinate
- lambda cyhalothrin
|
Spray increasing mite populations
before they become numerous. Use biorational pesticides that
conserve beneficial insects. |
|
twospotted spider mite
|
many deciduous trees |
- as above (for spider mites)
|
Spray increasing mite populations before
they become numerous. Use biorational pesticides that conserve
beneficial insects. |
|
spruce spider mite
|
evergreens |
- as above (for spider mites)
|
Spray increasing mite populations before
they become numerous. Especially serious on juniper. Use
biorational pesticides that conserve beneficial insects. |
|
Pest |
Hosts |
Pesticide |
Remarks |
Twig pruners/
twig girdlers: Family Cerambycidae, Order Coleoptera |
twig prunners/
twig girdlers
|
oak, maple, linden, flowering
fruit trees,
and others
|
|
Prune out.
No effective control available. Control rarely is necessary
to protect tree health. |
|
Pest |
Hosts |
Pesticide |
Remarks |
Weevils: stem feeding, Family Curculionidae,
Order Coleoptera |
white pine weevil
|
pine and spruce, especially
white pine and Norway spruce |
- chlorpyrifos (nursery
only)
- permethrin
|
Spray mid- to late April.
Spray only terminal portion of tree. |
|
Pest |
Hosts |
Pesticide |
Remarks |
Weevils: root feeding, Family Curculionidae,
Order Coleoptera |
black vine weevil
|
many species herbaceous plants,
especially yews |
- Beauveria bassiana
- bifenthrin
- chlorpyrifos (nursery
only)
- cyfluthrin
- deltamethrin
- fluvalinate
- imidacloprid
- lambda cyhalothrin
larvae:
- Beauveria bassiana
- bifenthrin
- imidacloprid
|
Spray in June, July for emerging
adults; spray soil for larvae in July, August. |
|
strawberry root weevil
|
many species herbaceous plants, especially
conifer seedlings |
- as above (for black vine weevil)
|
Spray in June, July for emerging adults;
spray soil for larvae in July, August. |
|
Pest |
Hosts |
Pesticide |
Remarks |
Weevils: trunk feeding, Family Curculionidae,
Order Coleoptera |
Pales weevil
|
white, Scotch pine; firs;
spruce |
- chlorpyrifos (nursery only)
- permethrin
|
Spray foliage in May, June
and again in August, September to kill feeding adults. |
|
Northern pine weevil
|
all pines, spruces |
- chlorpyrifos (nursery only)
- permethrin
|
Spray foliage in May, June and again
in August, September to kill feeding adults. |
|
Insecticide names: Common name, professional product, and consumer product.
(bold indicates a professional product requiring a MN Pesticide
Certification and License)
common name |
professional product |
consumer product |
|
|
|
|
|
- Ortho Isotox
- Ortho Rosepride Systemic
|
|
|
- Safer brand 3-in-1 garden spray concentrate
- Bonide rose rx 3 in 1
|
- Bacillus thuringiensis
var. kurstaki
|
|
- Potato-shield biological insecticide, gardens alive
|
- Bacillus thuringiensis
var. tenebrionis
|
|
- Bonide Colorado Potato Beater
|
|
|
|
|
|
|
|
|
- Ortho Rose & Flower
- Ortho rtu Housplant & Garden
Insect Killer
|
|
|
- Ortho Bug-B-Gon Garden & Landscape rtu
- Garden Tech Sevin-10 rtu
|
|
- Chlorpyrifo Pro (nursery only)
|
|
|
|
|
|
|
- Bayer Advanced Garden Multi-Insect Killer
- Raid Yard
Quard Fower Nozzle
|
|
|
- Bonide Delta Eight Insect Control
- Enforcer Home Pest Control xii
|
|
- Kelthane Dow Agrosciences
|
|
|
|
|
|
|
- Bonide Systemic Rose & Flower Care 8-12-4
- Bayer
Advanced Garden 2 in 1 Systemic Rose & Flower rtu
Granules
|
|
|
- Ortho Bug-B-Gone Multipurpose Spray
- Bonide Bug Beater
rtu
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
- Bayer Advanced Tree & Shrub Insect Control
- Bayer
Potting Mix For Roses & Flowers 0.05-0.5-0
|
|
|
|
|
|
|
|
|
- Ortho Malathion Plus Insect Spray Concentrate Ornamentals
- Ferti-lome
mal-a-cide
|
- oil summer spray ultra fine
|
- Oil summer spray Ultra fine
|
- Ferti-lome Scalecide
- Sun Spray Ultra-Fine Year-Round Pesticidal Oil
|
- oil dormant ortho fertilome
|
|
- Ferti-lome Dormant Spray
- Frank's Dormant & Summer
Oil Spray
|
|
|
- Ortho Bug B Gon Garden & Landscape Ready Spray
- Bonide Borer - miner Killer Concentrate
|
|
|
|
|
|
|
|
|
- Safer Yard & Garden Insect Killer Concentrate
- Frank's Rose & Floral Insect Spray
|
|
|
|
|
|
- Ferti-lome Borer, Bagworm, Leafminer & Tent Caterpillar
Spray
- Bulls Eye BioInsecticide
|
For additional information, see also the following
University of Minnesota publications:
Birch
Leafminers
The Bronze Birch Borer
Spring and Fall Cankerworms
Native Elm Bark Beetle Control
Insect and Mite Galls
Leaf
Beetles in Urban Landscapes
Sawflies
of Trees and Shrubs
Scale Insects of Trees and Shrubs