Controlling Insect Pests in the Garden

Dr. Monica ValentovicAnd

Dr. Gary Rankin

Control of Pests is a decision making process

• Plant selection – Japanese beetles• Horticulture practices• Pesticide management

Horticultural practices to minimize disease

• Planting – Plant at maximum distances for air flow– 28- 30” HT

• Prune– Prune centers to maintain air flow– Minimize disease– Prune diseased canes or buds

Horticultural practices to minimize disease

Horticultural practices to minimize disease

Horticultural practices to minimize disease

• Water– Essential for growth of roses– Water to minimize splashing of leaves– Overhead watering prior to spraying to cool off

roses and remove spray residue– Mulch to minimize water loss– Watering but splashing rose leaves can induce

black spot• Remove bottom leaves

Check your garden for disease

• Or get the Past President of the ARS to survey your garden

PESTS??

• An undesirable substance in the garden• Fungus – blackspot

• Insect– Spider mites

• Weed• Individual

Insecticides

• Use only when needed• Seasonal problems– April Aphids and Midge– May & June Thrip & Japanese beetles– July & August Spider Mites– September Cucumber beetles– -October Scale

Insecticides- April & MayAphids and Midge

– Aphids• Water• Insecticidal soap, dish soap• Pyrethrin• Bayer products

Insecticides- April & MayAphids and Midge

– Aphids• Water• Insecticidal soap, dish soap• Pyrethrin• Bayer products

– Midge• First step eliminate larvae prior to dispersal from soil• Talstar, Imidacloprid & cyfluthrin

Midge

• Control: Monitor plants in early spring to detect midge. Cut off damaged blooms, foliage.

• Treat rosebeds with Triazicide or other soil insecticide.

• Spray with insecticide –every two weeks

We need to protect our blooms in the summer

from..

May & June Thrips & J. Beetles

Thrips

Thrips cause damage such as browning on the inside petals of light colored roses.

• Tiny, slender, brownish winged insects, barely visible to naked eye.

• Look for them in the petals of light colored roses, especially in the spring.

• Damage caused by rasping mouthparts. • Cause some blooms not to open.

Thrips• Treatment: Mist flowers and top foliage with

Orthene, Cygon 2E, Bayer Rose and Flower, Merit, Conserve, flower bonnets.

                                                            

                                

                            

                                                            

Japanese Beetles

• Treat lawn for grubs• Treat roses– Carbaryl (Sevin) 2times/week– Remove beetles and place in soapy

water– Imidacloprid + cyfluthrin – Pyrethrin + Rotenone– Neem oil is deterrent, tastes bad

Rose Cane Borer

• Bores holes in larger canes• Prune below hole• Cut at 45o or greater• Seal cuts • Spray pyr/rotenone,

cyfluthrin, cygon 2E

July & August Spider Mites

• Water underside every 3 days• Water rose beds• Avid• Imidacloprid/cyfluthrin• Pyrethrin/Rotenone• Floramite

Miticides

• Life cycle is 5-20 days depending on temperature– Higher temp more eggs are laid, higher infestation

• No systemic miticides-Why? – Mites feed near plant veins and midrib not in

xylem or phloem so never come in contact with systemic miticides

Miticide selection

• Avid/Lucid– Translaminar– Only Kills adults– Works on opening Cl channel in nerves

• Floramite– Works by Contact, must spray underside of leaves– Kills all stages of life cycle– Closes Cl channels in nerves

Miticide selection

• Hexygon– Kills adults and Larvae– Contact spray, must spray underside of leaves to be

effective– Inhibits embryo and larva formation

• Forbid 4F– Translaminar and contact; lipid synthesis inhibitor

causes water imbalance and dehydration in mites and whiteflies

– Kills all stages – Residual action for 4-8 weeks

Miticide selection

• TetraSan– Translaminar– Kills eggs and larva, minimal effect on adults– Inhibits formation of exoskeleton• Prevent eggs and larva developing normally

• Akari, Sanmite and Shuttle– Inhibit mitochondria– Akari contact and stomach– Akari, Sanmite and Shuttle work by contact

Sept & Oct – Cucumber Beetles

-Pyrethrin/rotenone-Neem oil-Ultrafine oil-Cyfluthrin-Water jet for eggs

October - Rose Scale

• Rose scale is an insect• Attaches to canes• May look scaly• Appears in Fall• Lime Sulfur, Dormant oil

Enjoy your roses

Thank you for

your attentio

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