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Integrated Pest Management
for Vegetable Gardens
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Integrated Pest Management (IPM)
• Utilizing a variety of pest management measures including
cultural, physical/mechanical, biological, and chemical to
keep pests at acceptable levels.
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Cultural Methods of Control
• Plant resistant varieties
• Inspect plants
• Crop rotation
• Sanitation
• Good cultural practices (fertilizer, watering, etc.)
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Crop Rotation
Carrots
Apiaceae
Onions
Subfamily - Allioideae
Peas
Leguminosae
Squash
Curcurbitaceae
Tomatoes
Solanaceae
Garden Map 2006
Tomatoes
Squash
Carrots
Onions
Peas
Garden Map 2007
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Mechanical Control
• Collars
• Screens or rowcovers
• Mulches
• Your fingers or your toes
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Biological Control
• Beneficial Insects
– Lady beetles, lacewings, wasps, etc.
Excellent Not so great
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Plants To Attract Beneficial Insects
• Dill / fennel
• Coriander
• Buckwheat
• Sweet Alyssum
• Sunflowers
• Cosmos
• California Poppy
• Cornflower
• Basil
• Borage
• Yarrow
• Catmint
• Coneflower
• Goldenrod
• Golden Marguerite
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Chemical Control
• Pesticides
– Conventional or Synthetic
– Botanical
– Biological
– Horticultural Oils
– Insecticidal Soaps
– Check post-harvest interval
– Label is the law!
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Insecticidal Soap
• Ingredients: Insecticidal
soap is sodium or
potassium salts combined
with fatty acids
• Application: Insecticidal
soap must come in direct
contact with the insect. It is
no longer effective once it
has dried.
• How It Works: The fatty acids
in the soap penetrate the
insect’s outer covering and
cause the cells to collapse.
• Pros:
• One of the safest pesticides.
• Non-toxic to animals.
• No residue.
• You can use on vegetables up
to harvest.
• Cons:Can burn or stress
plants. Don’t use in full sun or
high temperatures
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Bt (Bacillus thuringiensis)
• Ingredients: bacteria.
There are more than 80
types of Bt used as
pesticides
• Application: Generally
available in powdered form
that is sprinkled or dusted
on a plant. It must be eaten
by the targeted insect.
• How It Works: Bt is a stomach
poison. It releases toxins in the
stomachs of susceptible insects
which cause them to stop eating
and starve.
• Pros: Bt strains are very host
specific and will not harm people,
pets, birds or bees
• Cons: Slow acting. It may take
days for the insect to completely
stop eating and die. Breaks down
quickly. Can kill ‘good insects’ like
butterfly larva Breaks down rapidly
in sunlight. Can be a skin irritant.
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Pyrethrins
• Ingredients: Derived from
Chrysanthemum
cinerariifolium
• Application: Generally
found in powder form and
dusted on leaves.
• How It Works: Poisons the
insect, causing a quick
death
• Pros: Quick acting. Low
toxicity to animals.
Degrades within a day.
• Cons: Broad spectrum
insecticide. Kills any insect.
Very toxic to honeybees
• Precautions: Use
cautiously, only when you
have a major problem with
hard-to-kill insects.
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Rotenone
• Ingredients: Derived from
the roots of tropical
legumes
• Application: Dust onto
plant
• How It Works: Inhibits a
cellular process, depriving
insects of oxygen in their
tissue cells.
• Pros: Low residual effect.
Breaks down quickly in
sunlight.
• Cons: Broad spectrum
pesticide
• Precautions: Apply in the
evening, when bees are
less active.
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Potassium Bicarbonate • Ingredients: Potassium
bicarbonate usually combined
with horticultural oil and / or a
substance to improve
spreading and coverage of the
leaves. There are
commercially available
products such as GreenCure®
and Kaligreen, or you can
prepare your ownNote: Baking
soda or sodium bicarbonate is
often recommend for similar
fungus problems, however
research has shown potassium
bicarbonate works better and
is safer on plants.
• Application: Spray at the first
sign of disease or use as a
preventative before infection.
• How It Works: It’s still unclear,
but it appears that bicarbonates
can damage the cell wall and
possible create a pH that is not
conducive to further fungal growth.
The effect is immediate.Pros:
• Lasts 2 - 3 weeks as a
preventative.
• You can use on vegetables up to
harvest.
• Cons: Can burn plants, especially
if used in full sun. so Check label
and test on a small area before
spraying entire plant.
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Horticultural Oil
• Ingredients: Highly refined
petroleum oil
• Application: Mixed with
water and sprayed onto
foliage
• How It Works: Coats and
suffocates insects or
disrupts their feeding.
• Pros: Low toxicity to humans,
pets or birds . No toxic residue.
• Cons: Most effective against
soft bodied insects. Can cause
bluish evergreens to
temporarily lose their blue tint.
Can burn leaves
• Precautions: There are
several grades. Be sure to use
the one that is right for the
season in which you are
spraying.
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Neem
• Ingredients: Contains 2
ingredients, azadirachtin
(AZA0 and liminoids, both
frm the seed kernels of the
neem tree fruit.
• Application: Sprayed onto
plant leaves.
• How It Works: Upsets the insects
hormonal system and prevents it
from developing to its mature
stage. Most effective on immature
insects and species that undergo
complete metamorphosis.
• Pros: Non-toxic to humans
• Cons: Washes away in rain. Slow
acting. Breaks down in sunlight
Indiscriminate pesticide
• Precautions: Keep pets from
treated leaves until they dry.
•
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Damping-off
• Pythium and Rhizoctonia
• Fungus
• Spores survive in soil and on debris
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Damping-off Control
• clean potting mix & containers
• good air movement
• seed treatment - fungicides
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Cutworm
• Moth lays eggs on low growing plants
• Larva 1-2” gray color feed at night
• Overwinter as larva or pupae
• Likes weedy areas & sod
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Cutworm Control
• Collars
• Beneficial nematodes
– Steinernema carpocapsae
• Carbaryl (Sevin)
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Beneficial nematodes
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Aphids
• Small soft bodied various colors
• Suck sap from plants & spread virus diseases
• Winged and wingless
• Overwinter as eggs
or adults
• Some species only
produce females
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Aphid Control
• Forceful water
• Foil mulch
• Insecticidal soap
• Azadirachtin (Neemix)
• Rotenone
• Esfenvalerate
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Whitefly
• White insects 1/16” long
• Eggs to nymph to “fly like”
adult
• Suck plant sap
• Do not overwinter outdoors in
NJ
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Whitefly Control
• Floating row covers
• Insecticidal soap
• Pyrethrum
• Pyrethrin
• Esfenvalerate
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Tomato Hornworm
• 5”moth lays eggs on tomato
plants
• 4” larva long chews on plants
• Overwinter as pupa in soil
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Tomato Hornworm Control
• hand-pick
• natural predator
– Trichogramma wasp
• Bacillus
thuringiensis - Bt
• Carbaryl (Sevin)
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Pest?
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Tomato Leaf Blight
• Early Blight & Septoria Leaf
Spot
• Fungus disease
• Spores overwinter in soil on
crop debris
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Tomato Leaf Blight Control
• Tolerant varieties ‘Mtn. Supreme’
• Crop rotation
• Good air circulation
• Sanitation
• Fungicides
– Copper
– Chlorothalonil
– Mancozeb
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Fusarium & Verticillium wilt
• Fungus disease
• Spores live for years in soil
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Fusarium & Verticillium wilt control
• Plant resistant varieties
• Practice good crop rotation
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Choosing Varieties
• ‘Celebrity’ - VFFNT, 70 days,
All American Winner, mid-season, medium red fruit, determinate
V - Verticillium wilt
F, FF - Fusarium wilt race 1, 2
N - Nematodes
T - Tobbaco mosaic virus
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Virus Control
• Cull infected plants
• Control aphids, whiteflies, &
thrips
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Blossom End Rot
• Caused by a lack of calcium
• Common in first fruit & in plants in containers
• Rest of fruit safe to eat
(if spot is small)
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Blossom End Rot Control
• Add calcitic lime
• Keep soil evenly moist, use
mulches
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Slugs & Snails
• Various colors & sizes
• Shred plants
• Leave clear or silvery trail
• Likes moist shaded areas
with organic material
• Most overwinter as eggs
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Slug & Snail Control
• Traps – beer, piece of wood
• Diatomaceous earth
• Copper screening
• Iron Phosphate bait (Sluggo)
• Metaldehyde bait
• Carbaryl (Sevin) bait
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European Corn Borer/ Corn Earworm
• Moth lays eggs larva
hatch and burrow into
fruit
• Mature borer larvae
overwinter in NJ in corn
stubble, or stems of
plants, including weeds
• Two generations in NJ
• Earworm overwinters as
pupae in southern states
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European Corn Borer/ Corn Earworm
• Bacillus thuringiensis – Bt.
• Carbaryl (Sevin)
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Spider Mites
• Tiny pests related to
spiders
• Suck sap from plants
• Likes hot dry conditions
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Spider Mite Control
• Forceful water
• Insecticidal soap
• Horticultural oil
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Colorado Potato Beetle
• 3/8” Adults overwinter in soil lay eggs on
plants
• Larva feed on leaves
• 2 generations in NJ
• Resistant to many
pesticides
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Colorado Potato Beetle Control
• Hand-pick
• Heavy mulch
• Floating row cover with crop
rotation
• Bt tenebrionis on small larva
• Rotenone
• Pyrethrum
• Carbaryl (Sevin)
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Flea Beetles
• 1/16” adults overwinter in protected places
• Lay eggs in soil near plant roots
• Larva feed on plant roots
• Jump when disturbed
• 2 generations in NJ
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Flea Beetle Control
• Floating row covers with crop
rotation
• Hot pepper wax
• Carbaryl (Sevin)
• Esfenvalerate
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Verticillium Wilt of Eggplant
• Fungus disease – attacks many
types of plants including those
in the Solanaceous family
• Spores, microsclerotia, live in
soil for years -Up to 8 years
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Verticillium Wilt of Eggplant
Control
• Crop rotation – may have
limited affect
• Plant in clean potting mix in
containers
• Remove crop debris
• Fumigate soil
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Imported Cabbageworm
• Adult white butterfly native to Europe
• Eggs laid on plants
• 1” Larva chew on leaves
• Overwinter as pupa
attached to plants
• 3-4 generations
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Imported Cabbageworm Control
• Hand-pick
• Bacillus thuringiensis - Bt
(Dipel)
• Carbaryl (Sevin)
• Esfenvalerate
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Cabbage Maggot
• Adults similar to houseflies
• Overwinter as pupae
• Flies lay eggs in April to May
on soil near base of plants
• Eggs hatch into maggots
which bore into roots
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Cabbage Maggot Control
• Floating row covers with crop
rotation
• Protective collar
• Plant after June 1
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Squash Vine Borer
• Adult clear wing moth
• Eggs laid on stalks in early summer
• Eggs hatch into borers which tunnel into stem
• Overwinter as coccoon
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Squash Vine Borer Control
• Floating row covers – remove
at flowering
• Make several plantings (after
July 1)
• Hand destroy
• Bacillus thuringiensis Bt -
injection
• Rotenone
• Carbaryl (Sevin)
• Esfenvalerate
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Cucumber Beetle
• Adult beetles 1/5” long
• Overwinter as adults in plants
debris
• Eggs laid on plants near soil
• Larva feed on roots
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Cucumber Beetle Control
• Floating row covers – remove at
flowering
• Less attractive varieties (less
cucurbitacin)
• Rotenone
• Pyrethrum
• Carbaryl (Sevin)
• Esfenvalerate
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Powdery Mildew
• Fungal disease
• Can infect in dry weather
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Powdery Mildew Control
• Resistant & tolerant varieties
• Potassium bicarbonate
• Chlorothalonil
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Mexican Bean Beetle
• Adult beetles 1/4 “ long
• Overwinter in grass or weeds
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Mexican Bean Beetle Control
• Natural predator – wasp
Pediobius foveolatus
• Rotenone
• Pyrethrum
• Pyrethrin
• Carbaryl (Sevin)
• Esfenvalerate
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Bean Rust
• Fungal disease
• Reddish dusty spots on
lower surface of leaves
• Overwinters on residue
from diseased plants
• Spores can spread by
wind or by people, tools
and implements
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Bean Rust Control
• Resistant varieties
• Do not handle wet plants
• Chlorothalonil
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Corn Worm
• Corn earworm, European corn
borer, Fall armyworm
• Lay eggs on corn ears larva
tunnel into ear
• Populations build over summer
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Corn Worm Control
• Plant early – mid-April
• Vegetable oil plus Bt on silk
– 6 days after silk appears
• Carbaryl (Sevin)
• Esfenvalerate
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Corn Smut
• Fungal disease
• Overwinters in soil
• Favored by dry conditions
and temperatures 79-94 F
• Injury from environmental,
cultural or insect problems
helped to promote smut
development
• Delicacy in South America
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Corn Smut Control
• Plant resistant varieties
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Poor Pollination of Corn
• Plant in blocks
• Hand pollinate
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Root Knot Nematode
• Microscopic worm
• Infects roots causing
knots and stunted
growth
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Root Knot Nematode Control
• Rotate with marigolds
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Leafminer
• Adult fly (1/10”) lays eggs on
underside of leaves in early
spring
• Eggs hatch into maggots
which tunnel in leaf
• Overwinter as pupa in
soil
• Larger plants more tolerant of
damage
• 2-3 generations/year
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Leafminer Control
• Floating row covers
• Permethrin
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