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Doing it Biologically !!!. Opportunities to use Natural Enemies on Landscape Ornamentals. Michael Brownbridge Entomology Research Laboratory University of Vermont. Biocontrol success in greenhouses… controlled environment closed environment

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slide1

Doing it Biologically !!!

Opportunities to use Natural Enemies on Landscape Ornamentals

Michael Brownbridge

Entomology Research Laboratory

University of Vermont

slide2

Biocontrol success in greenhouses…

    • controlled environment
    • closed environment
    • once released, natural enemies remain on the crop
slide3

Why are there fewer options for landscape ornamentals ?

    • environmental conditions more variable, may be sub-optimal
    • pests can migrate in from surrounding environment
    • natural enemies will head for the food source – may not be on your plants!

Few beneficials with proven efficacy

slide4

Sanitation

IPM

Biological

Cultural

Chemical

slide5

Pest management is a

dynamic process:

  • Pest outbreaks vary from year to year
  • Influenced by location, weather
  • Plant variety
  • Market
  • Clientele
slide6

Why biologicals? Why IPM?

  • 1. Pesticide stewardship important:
    • to delay resistance
    • limited number of new insecticide registrations; FQPA = net loss

2. Health and safety of staff, general public

3. Environmental concerns

4. Difficult to work nr. schools, residential areas

slide7

Scouting – knowing what’s going on on your plants!

  • Early detection
  • More control options
  • Better control
  • More cost-effective
slide9

Bacillus thuringiensis - Bt

  • Bt kurstaki e.g. Dipel caterpillars
  • Bt aizawai e.g. Xentari caterpillars
  • Bt san diego, tenebrionis beetles
  • elm leaf beetle, imported willow leaf beetle;
  • not viburnum leaf beetle
slide10

Viburnum leaf beetle eggs

Prune infested twigs Oct-mid April

slide11

Optimizing Bt efficacy:

  • Select correct strain
  • Good spray coverage
  • Apply early vs. young larvae
  • More susceptible

Less damage, less product, more cost-effective

slide13

Nematodes for slug control

Produced by:

Becker-Underwood

Sold through:

AgBio Inc.

slide14

HETEROMASK™

Heterorhabditis bacteriophora

slide15

Steinernema carpocapsae

    • Effective at 70 – 85° F
    • Dogwood borer, banded ash clearwing borer, lilac borer, oak borer, peach tree borer (larvae)
  • Steinernema kushidai
    • Japanese beetle, oriental beetle (larvae)
    • Difficult to mass produce
  • Steinernema feltiae
    • Fungus gnat larvae in propagation houses
    • Will work at temps down to 50 ° F
slide16

Atheta coriaria

rove beetle

Predator of shore fly and fungus gnat larvae, pupating thrips.

Excellent control of shore flies obtained when released at 100 beetles per week per 5000 sq. ft of greenhouse; releases made in early morning or late evening.

slide17

Nematode use practices:

  • Active vs. larvae; most effective in containers/pots
  • Apply to moist soils by drenching
  • Apply when host larvae present
  • Soil temperature is important
  • Compatible with many fungicides and insecticides
  • www.agnr.umd.edu/users/ipmnet/nemanurs.htm
slide18

Beauveria bassiana

Metarhizium anisopliae

‘Rhizosphere-competent’

slide19

Ladybeetles

  • Active release?
  • Naturally-occurring
slide20

Green lacewing larvae

Chrysoperla carnea

feeding on azalea lace bug nymphs

lacewing eggs

slide21

Spider mites

  • Rapid reproductive rate
  • Short generation time
  • Damaging populations build quickly
  • Pesticide resistance
  • Broad-spectrum pesticides, resurgence
slide22

Spider Mite Predators

  • Phytoseiulus persimilis
  • good vs. two-spot in greenhouses
  • does not work well outdoors in cooler regions
  • Neoseiulus fallacis
  • wider host range
  • works outdoors (strawberries, apples)
  • may overwinter outdoors
  • use early in infestation cycle
  • release onto infested plants
  • www.ent.orst.edu/prattp/plant.html
slide23

Biocontrol of euonymus scale

  • Cybocephalus nipponicus
  • Originally from Korea
  • Released in NJ on infested euonymus
  • Established in infestation sites
slide24

Conservation Biological Control

  • Conserve naturally-occurring beneficials
  • Create an environment that is attractive to beneficials
  • Avoid use of broad-spectrum insecticides

Enormous benefits, minimal cost

slide25

Habitat manipulation to increase biodiversity

Flowers attract predators and parasitoids; other insects serve as alternate prey/hosts

slide26

Use of alternative ground covers

  • University of Maryland, Paula Shrewsbury www.shrewsburylab.umd.edu
  • wood mulch on/in place of fabric mat
  • provides a more favorable habitat for generalist predators
  • refugia, alterative prey

ground beetle larva

predatory mites

slide27

In avocado orchards, mulching increased the incidence and activity of natural enemies and other beneficial arthropods.

slide28

Using pesticides

  • Create habitats to maintain natural enemies (refugia)
  • Flowering plants, ivies, vines
  • Select and use ‘soft’ or ‘reduced-risk’ pesticides
  • Short residual activity, narrow host spectrum, IPM
  • compatible. EPA classification, limited use
  • restrictions
slide29

Bio-derived Products

Minimum-risk pesticides, exempted from registration requirements – even in NY!!!

  • E-Rase – Jojoba oil; whitefly control
  • GC-Mite – cotton seed and clove oils, garlic extract; mites, thrips
  • Hexycide – rosemary and mineral oil; whiteflies?
  • Organocide – sesame oil; aphids, mites, powdery mildew

Very little efficacy data available on any of the products. May be phytotoxic – test on a limited number of plants before treating a whole crop!

slide30

Spray Oils and Insecticidal Soaps

  • Ultra-Fine Spray Oil (Whitmire)
  • Dormant oils
  • Synergy Super Fine spray oil emulsion (Griffin)
  • - micro-emulsion process = remains in suspension for 3 h
  • PureSpray Foliar 15 (Purespray Green?); Petro Canada
  • - used in Canada on tree crops, fruits, ornamentals
  • - pursuing registration in the US
  • Olympic Insecticidal Soap, M-Pede

Broad-spectrum, but short residual; often applied at times of year when little natural enemy activity.

Beware of phytotoxicity, esp. on spruces and conifers, after bud-break or in early dormancy.

slide31

Neonicotinoid Insecticides

Similarities:

  • Expensive
  • Long residual control
  • Excellent plant safety, low mammalian toxicity
  • Systemic or translaminar movement
  • Active vs. piercing/sucking insects
  • Variable activity against other pests
  • Similar modes of action, risk of cross-resistance
slide32

Neonicotinoid Insecticides

Pioneer products: Marathon, Discus, Xenith, Merit

New products:

  • TriStar (Cleary’s) – Acetamiprid

spray application only

  • Safari (Valent) – Dinotefuran

very water-soluble, readily translocated

  • Clutch/Arena (Arvesta) – Clothianidin
  • Flagship (Syngenta) – Thiamethoxam

Various formulations for spray or drench application

slide33

Other reduced-risk insecticides

  • Flagship, Endeavor
  • very effective vs. aphids (sprays), mealy bugs (drench)
  • Conserve
  • caterpillars, leaf-feeding beetles, short residual
slide34

Reduced-risk miticides

  • TetraSan
  • translaminar activity vs. spider mites, ovicidal, slow-acting
  • Floramite
  • good for early-season infestations, compatible w. predators, selective
  • Hexygon
  • restricted use label in NY
  • Ornamite

Limited n. applications per growing season; resistance management

slide35

Products to avoid:

  • organophosphates Dursban, Diazinon, Dimethoate
  • carbamates Sevin, Furadan
  • pyrethroids Talstar, Tame, Ambush (Pounce)

Broad-spectrum, long residual, highly toxic.

Many withdrawn for nursery and residential use; restricted use.

Pest resurgence, secondary pest outbreaks.

www.ent.orst.edu/prattp/pesticides.html for compatibility with N. fallacis

slide36

Can you do it biologically?

  • Take active steps to release and preserve natural enemies
  • Create an environment that conserves and encourages activity
  • Use reduced-risk pesticides only when necessary in a planned IPM strategy
  • Will depend on plant species, pest and infestation level, time of year, location and clientele
slide37

Thanks to:

New England Grows

Paula Shrewsbury, Univ. Maryland

Carol Glenister, IPM Labs, Locke, NY

Dan Gilrein, Cornell Univ. Cooperative Extension

This presentation is available for download on our website:

www.uvm.edu/~entlab

Click on ‘Recent Publications’