“the best defense is a good offense” ipm for the community gardener · 2018-07-13 · squash...
TRANSCRIPT
“The Best Defense is a Good Offense”
IPM for the Community Gardener
Something to think about……..
What is IPM?
•Integrated
•Pest
•Management
What is IPM
IPM is a sustainable approach to managing pests through biological, cultural, physical and chemical tools in a way that minimizes risks to the community.
www.ipminstitute.org
Advantages that Community Gardens have:
• Less wind
• Less predators
• More diversity in cropping systems
• Smaller areas to control
Disadvantages
• Limited on pest control options
• Limited space to rotate crops
Nature always Wins……
©University of Maine
INSECT MANAGEMENT USING IPM
Scout and Scout Again!!!!!
• Look under the leaves
• Around the soil line
• Net sweep
• Traps
• Degree Days
Photo Credit: Debbie Roos
Preventive (Cultural) Control Measures
• Appropriate seed variety
• Maintain sanitation
• Mulches
• Rotation, Rotation, Rotation
Mechanical or Exclusion Techniques Controls
• Row covers
• Trap crops
• Ring Barriers
Biological Controls
• Maintain natural predators & encourage natural to visit you
• Release of biologicals is not
highly recommended
• Maintain or enhance natural enemy population
Pollen and
Nectar
Winter Cover
Prey Nesting
and Retreats
Responsible Pesticide Use
4 R’s
Right product
Right time
Right place
Right applicator
KNOW YOUR PEST
FRIEND FOE
Photo Credit: Debbie Roos
Important Definitions
VECTOR-An insect or any living creature that can transmit a disease
HOST A plant which aids, shelters, or protects another plant in its growth, as those which are used for nurse crops
The BAD Guys
Aphids
• Affect many crops particularly cole crops
• Sucking insects
• Many generations/year
• Reproduce very rapidly
• Hand removal
• Spray with high pressure water
• Insecticidal soaps*
Photo Credit: Debbie Roos
Thrips
Sucking insects Vector some viruses Often see damage before the insect
entomology.wsu.edu/insectoftheweek/thrips.html
Photo Credit: Utah State University
Cabbage Looper
• Affects many brassicas, including Cabbage, broccoli, cauliflower, collards, mustard, etc.
• Overwinters as pupa, emerges in the
spring, lays eggs, larvae feed for 2-4 weeks • Multiple generations
• Hand pick or Bt
© John Van Dyer
© Utah State University
Diamond Back Moth
• Overwinter as adult moths • Lay eggs singly • Chew underside of leaves • Many generations per year • Hand pick or Bt
© Ryan Skype
© Utah State University
Imported Cabbage Worm
• Moths emerge in spring
• Lay hundred
• Many generations per year
• Remove and kill eggs
Bt
Photo Credit: Sarfo
©Utah State University
Cucumber Beetle (Affects cucurbits, bean and corn)
Spotted Striped
Less active during cool, rainy weather Vector bacterial wilt Plant rotation, eggs are near host plant Host plant Plant late Row covers, take off for pollinator
Photo Credit: Debbie Roos
Photo Credit: Debbie Roos
Photo Credit: Lawrence Ralph Berg
Squash Bugs
• Affect squash and pumpkins
• Over winter as adults • Lay eggs under leaves, in patterns of about 12
• Emerge and suck sap from leaves stems • One generation per year
• Plant early or late • Collect and destroy eggs and nymphs
• Trap with piece of shingle or cardboard during heat of day and destroy
Photo Credit (both): Debbie Roos
Squash Vine Borer
• Overwinter as pupa and emerge as moths
• Lay eggs and larvae bore into stems
• Get rid of infected plants
• Rotate
• Can kill larvae
• Plant late (after June 24th)
• Plant a couple of early trap crops and remove when infected
Photo Credit (both): Jeff Hahn UMN
Cucumber Beetle (Affects cucurbits, bean and corn)
Spotted Striped
Less active during cool, rainy weather Vector bacterial wilt Plant rotation, eggs are near host plant Host plant Plant late Row covers, take off for pollinator
Photo Credit: Debbie Roos
Photo Credit: Debbie Roos
Photo Credit: Lawrence Ralph Berg
Colorado Potato Beetle
• Destructive at larval and adult stages
• Overwinters as adults
• Emerges in spring and lays eggs in clusters of 10-30
• Handpick
Photo Credit: Scott Bauer
Photo Credit: “Pollinator”
Japanese Beetle
• Common Lawn Pest
• Feeds on many types of vegetable
• Larva feeds on roots
• Adult feeds on foliage, will skeletonize a plant
• Hand pick in the morning hours
Photo credit: Bruce Martin
Photo credit: USDA-Aphis
Mexican Bean Beetle
Affects beans (all kinds) Adults overwinter in plant debris, Eggs are yellow Adults and larvae feed on underside of leaves Handpick and destroy. Remove debris
Leaf hoppers
• Sucking
• Several generations/year
• Transmit disease
• Very difficult to control
• Potato leaf hopper walks sideways
http://insects.tamu.edu/extension/youth/bug/bug043.html
White fly
• Vector for 70+ viruses
• Yellow sticky traps to monitor
• Wash the leaves
• Insecticidal soaps
• Remove leaf litter
• Yellow sticky traps with
mineral oil
Tomato Hornworm
• Seem to appear out of nowhere
• Heavy feeder
• Leave large feces
• Pick them off
Photo credit: George Bredenhoft
Photo credit: Shawn Harahan
Cutworms
• Destructive to all garden vegetables
• May never see them, feed at night
• Look under debris
• Put collar of newspaper, aluminum foil around base of transplants
• Turn to the soil over
Photo credit: John Obermyer
Spider Mite
• Not technically an insect
• Problem during hot, dry weather
• Spread easily and reproduce rapidly
• Can be sprayed off
• Keep plants well watered
Leaf Miner
Affects many vegetable types
Hibernate in cocoons on the soil surface
Several generations per year
Larvae feed inside of leaves
Turn soil
Pick off and dispose of infected leaves
© Texas A & M University
IPM in your Garden Begins the Fall
REMOVE ALL
Diseased & insect infested plant material
Dispose of off site
Remove any weeds particular those gone to seed
Remove any fruits that have fallen to prevent volunteers
http://www.longislandhort.cornell.edu/vegpath/ photos/lateblight_tomato.htmell.edu
Game Changers
Brown Mamorated Stink Bugs Spotted wing drosphila
The Good Guys
Minute Pirate Bugs
• Eats eggs, nymphs
• Very small
• Biting
Photo Credit: Debbie Roos
Praying Mantis
• Feeds on aphids, beetle, bugs, caterpillars
• Not selective in attacking good or bad
Photo credit: Adamantios
Lace Wing
• Larvae feeds on aphids, mealy bugs, scales, mites
• Will eat each other © Edward S. Ross
Syrphid Fly
• Larvae feed on aphids, small caterpillars and thrips
• Adults feed on pollen and nectar
© Oregon State University
Braconid Wasp
• Parasite Pupa
• Parasitize aphids, larvae of moths and butterflies, and some beetles
Photo Credit: Debbie Roos
How to Keep the Good Guys
• Use pesticides wisely
• Flower strips and borders
• Provide nectar, pollen and shelter
Purchasing & Releasing Beneficial Insects
• Very difficult to time properly
• Make sure that beneficial matches the pest problem
• Best used in greenhouses and on islands
Other Friends
• Assassin Bug
• Ground Beetles
• Tachinid Fly
• Wolf spiders
• Some Stink Bugs
• Many more
DISEASE MANAGEMENT
Using IPM
Powdery Mildew
• Affects cucurbits and okra
• Prevalent during rainy and high humidity weather
• Spread by rain, wind and insects
• Water in the morning
• Practice rotation
• Copper or sulfur fungicide as preventative
Downy Mildew
Formation during cool, wet weather, usually after July 1
Photo credit: Ontario Ministry of Agriculture
Early blight
• Fungal disease, Affects tomatoes and potatoes
• Use resistant varieties
• Begins on lower leaves
• Can be spread by infected seeds, wind, equipment and can survive in the soil
• Keep your plants healthy
• NEVER and I mean never plant tomatoes in the same place the following year
• Copper sprays are only preventative
• Destroy all infected material
© University of Minnesota
Late blight
• Fungal disease, can only survive on live tissue. Problem in tomatoes and potatoes
• Whitish grown on edge of lesion. Once dead the area around the lesion will be greyish-whitish on potato. First symptom will be a greasy-looking lesion on a leaf
• Spread through seed and planting material
• Rotation, rotation © Cornell University
Septoria Leaf Spot
• Fungal Disease which affects Solanaceous crops
• Spread by splashing water, old plant debris, infected seeds and seedlings
• Water soaked lesions will appear on the underside of older
leaves
• Rouge out infected plants
• Rotation
Bacteria Spot
• Affects tomatoes and peppers
• Spread through infected seeds and seedlings, splashing water. Prevalent during wetter seasons
• Spots are water –soaked lesions, leaves will be deformed and drop off
• Prevention by sterilizing seeds, using resistant cultivars, mulching and rotation
• Copper sprays only preventative
© University of Massachusetts
Bacterial Wilt
• Affects cucurbits
• Vectored by cucumber beetles (3%-5%) are carriers
• Prevent beetles
• Infected plants cannot be saved, get rid of them
• Trap crops only work if managed with proper chemical controls
The Other Phytophthora
• “Damping off” in seedlings
• 100 species described
• Fungus (water molds)
• Wet weather, lack of air movement in the soils
• Produce seedlings in pathogen-free media
© Michigan State University
Virus
• TMV
• TLCY
• TS
• CMV
• All spread by insects-whiteflies, thrips, leaf-hoppers or mechanical means.
• Control insects and sanitize tools, resistant varieties
© Asian Vegetable Research and Development Center
Photo Credit: William Brown Jr.
Slugs and Snails
• Remove debris where they can hide
• Pick them after dark
• Trap
© Texas A & M University
Other friends
©Canal Photos
Products
Bt (Bacillus thuringiensis)
• Narrow Spectrum
• Low residual
• Safe for beneficials
• Resistance Reported
• Takes insects a day or two to die
• Should be rotated
• Young larvae most greatly affected
Spinosad
• Broad spectrum; including Colorado potato beetle
• Should be rotated
• Degrades quickly
Products
Horticultural Soaps
• Works on soft-bodied insects
• Can be phytotoxic to plants
• Must be soaps-not detergents
Horticultural Oil
• Smothers target insect (and beneficials)
• Short-term
• Must be applied at right time, can burn plants
Common Mistakes
• Pesticides are the line of first defense
• If it works on one thing, it must work on all
• More is better