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Insects of Roses Prof. Robert L. Morris Area Horticulturist, UNCE, Emeritus Adapted from University of California IPM Project http://www.ipm.ucdavis.edu/PMG/PESTNOTES/pn7466.html


COMMON INSECT AND MITE PESTS The key to control: • careful selection of varieties • good attention to appropriate cultural practices • occasional handpicking or using soap and water to spray away pests • control weeds • keep an eye out for rising populations of natural enemies and encourage them


Aphids


Natural Pest Control


Chemicals 1. 2. 3. 4. 5.

Water Soap and water ½ and ½ solution of Listerine and water Neem Imidacloprid (Bayer)


Insects and Mites That Cause Leaves to Stipple or Yellow • Spider mites • Rose Leafhopper


Spider Mites - leaf scorch, leaf bronzing, dusty


Non chemical Control • Insect screens • Yellow sticky traps


Rose Leafhopper - stippling


Insects That Distort or Discolor Blossoms • Western Flower Thrips


Insects That May Chew Blossoms and/or Leaves • • • • • • •

Leafcutter bees Caterpillars Earwigs Rose curculio Fuller rose beetle Hoplia beetle Rose slug


Leafcutter Bees – cuts circles in leaves and petals


Caterpillars – feed on rose leaves and may tie leaves


Rose Curculio – punches holes in flowers and buds


Fuller Rose Beetle – chews flowers and leaf edges


Hoplia (June) Beetle – chews holes in flower petals


Rose Slug – skeletonize leaf surface and holes in leaves


Insects That Cause Canes to Die Back

• Borers • Scale insects • Raspberry horntail


Flatheaded and Cane Borers cane dieback


Borer Control • Cane borer: Seal the end of the cane with Elmer’s glue

• Flatheaded borer: Prevent stress and sunburn on woody tissue


Scale Insects – stunting and dieback


Raspberry Horntail – tips of canes wilt and die


Rose Midge tip dieback and regrowth


COMMON NATURAL ENEMIES OF INSECT AND MITE PESTS IN ROSES • Aphid parasites - aphids • Minute pirate bug – mites, scales and thrips • Green lacewing –aphids and other soft bodied insects • Ladybird beetle - aphids • Soldier beetle - aphids • Syrphid fly – hover flies, aphids • Predacious mites - mites • Spiders - omnivorous


Aphid Parasites


Minute Pirate Bug


Green Lacewing


Ladybird Beetle


Soldier Beetles


Syrphid Flies


Predacious Mites


Spiders


Non Chemical Control • • • • • •

Hand picking Soap and water ½ Listerine + ½ water Pruning Water sprays Improved nutrition and water management • Mulch • Light • Air movement


Soft Pesticides • Bt (Bacillus thuringiensis) Dipel, Thuricide – caterpillars

• • • • • •

Horticultural oils (aphids, scales, mites) Neem (insecticide, fungicide) Spinosad (caterpillars, thrips, leafhoppers) Insecticidal soaps (general) Diatomaceous earth (rose slugs) Pyrethroids


Hard Pesticides • • • • • • • • • •

Orthene Di-Syston Malathion Methoxychlor Sevin Mavrik Talstar Merit Floramite Hexygon


QUESTIONS?

Insect Pests of Roses  

A brief overview of insect pests of roses in the Las Vegas Valley, Nevada.

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