Integrated Pest Management and Pesticides

Bruce P. Alber, CF

Wilbur-Ellis Company

balber@wilburellis.com

Pesticide definition• A product that prevents, destroys,

repels, or mitigates a pest (FIFRA)• Christmas tree pesticides

• Herbicides Fungicides• Insecticides Rodenticides• Deer Repellants

How will you spray?

Calibration is critical• How many gallons of mix per acre?• Constant walking speed, spray pressure,

nozzle type• Different people walk different speeds

• Careful calculation of pesticide per gallon of water depends upon calibration

Calibration is critical• Proper pesticide rate per acre =

• Enough product to control the pest• Too much product can damage trees and

waste money• Too much product is illegal

• Not enough product wastes money, doesn’t kill the pest, can cause weed escapes

Pesticide use: IPM• Correctly identify the pest• Is the pest population above a level of

damage concern?• Can an early treatment stop the population &

reduce the need for repeated applications?• Is the pest life cycle at the succeptable time

to treat?

Don’t spray by the calendar!

Are you a licensed applicator?- necessary for purchase &

application of Restricted Use Pesticides

Choosing a Christmas tree pesticide• Always read and follow all label directions• There must be specific recommendations

for the site: Christmas trees• Conifer plantations?• Not forestry (Oust XP)• Not non-crop

Modes of Action questions• Why does one pesticide control some

species but not others?

• You can tank mix some pesticides•Two or more herbicides in a tank•Mix an insecticide + a fungicide

Herbicide activity types• Foliar spray: what stage of plant

growth is best for control? Early leaf, bud stage, full extension, late summer?

• Soil active spray: prevent weed seed germination

Soil Active Herbicides: Conifers& Plant selectivity

• Physical selectivity:• Soil active – solubility, soil adsorption

breakdown half life• Herbicide location in soil vs. plant roots

• Growth stage selectivity:• Weeds actively growing?• Seedling weeds?• Conifers dormant?

What does this all mean to the grower on the ground?• Mix herbicides with different modes of

action can broaden the weed control spectrum:• Westar: Oust + Velpar pre-mix• Mix your own: glyphosate + Atrazine

• Understand the seasons of control by herbicide

Herbicides and conifer safetyHerbicides and conifer safety

• Conifer safety depends upon the herbicide• Dormant conifers are less likely to be

damaged

• Directed sprays reduce tree exposure and damage

Prevent herbicide resistant weeds!• Rotate your herbicide use

• Use different mode of action herbicides

• Tank mix with different modes of action herbicides

Insecticide & miticide use• Scout often to watch for insects & mites

• When do they hatch?• What is the population trend?• What is the best growth stage for good

control?• Weather forecast: hot weather can cause a

mite population explosion

Miticide modes of action• What life stage does the pesticide kill

the insect or mite? Egg, larva, adult?

• Does the miticide kill the adults or adults and the eggs?

• Does the pesticide kill beneficial insects too?

Fungicide useFungicide use• Scout your fields for needle discoloration,

fungal fruiting bodies from last year

• When will the trees be harvested?• Most fungicide treatments are 2-3 years

before harvest. Especially the harvest year!

Questions, comments?Bruce Alber, CF

Wilbur-Ellis Company

BAlber@wilburellis.com503-799-1428