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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Opportunities to use Natural Enemies on Landscape Ornamentals
Entomology Research Laboratory
University of Vermont
Few beneficials with proven efficacy
2. Health and safety of staff, general public
3. Environmental concerns
4. Difficult to work nr. schools, residential areas
Prune infested twigs Oct-mid April
Less damage, less product, more cost-effective
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.
feeding on azalea lace bug nymphs
Enormous benefits, minimal cost
Flowers attract predators and parasitoids; other insects serve as alternate prey/hosts
ground beetle larva
In avocado orchards, mulching increased the incidence and activity of natural enemies and other beneficial arthropods.
Minimum-risk pesticides, exempted from registration requirements – even in NY!!!
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!
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.
Pioneer products: Marathon, Discus, Xenith, Merit
spray application only
very water-soluble, readily translocated
Various formulations for spray or drench application
Limited n. applications per growing season; resistance management
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Many withdrawn for nursery and residential use; restricted use.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
New England Grows
Paula Shrewsbury, Univ. Maryland
Carol Glenister, IPM Labs, Locke, NY
Dan Gilrein, Cornell Univ. Cooperative Extension
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