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    • Rose Sawfly
    • Rose Bloom Balling
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Rose Sawfly

Amanda's Garden Consulting

Rose Sawfly/Rose Slug 

Ragged holes and skeletonized rose leaves are tell-tale signs of rose slug damage, also referred to as rose Tiny sawfly yellowish-green larvae feed on the green leaf tissue between leaf veins. Adult sawflies deposit eggs on the undersides of leaves.To prevent and control infestations, in mid spring inspect both leaf surfaces. Remove infested leaves or for more severe infestations spray with a forceful spray of water or use soap, horticultural oil and water or neem oil.

In May and June tiny, pale green worm-type larvae, with a brown head will start feeding on rose foliage. Pale tan blotches soon appear n the leaf surface. The larvae eat the green tissue on the leaf undersides so the leaf has an appearance of irregular windowpanes. Soon all that’s left are the veins; the leaf’s skeleton.
​

Adult sawflies and ¼ inch long and resemble a black wasp. Females deposit the eggs into the leaf edges. The eggs hatch in mid-April to early May. They first feed on the leaf undersides between the leaf veins. As they mature they go through numerous larval states until they fall to the ground. They then wrap themselves into a cocoon for protection as they pupate into adults. They overwinter in their cocoons then emerge as adults and to mate. Once they mate they deposit their eggs on leaf edges and they process continues. Luckily there is only one generation per year. The adults don’t feed on the foliage, only the larvae does.

Picture
Picture

Control of rose Sawflies

​Although the larvae damage is unsightly, it doesn’t kill the plants. Start inspecting the underside of rose leaves in mid-April.  The easiest and quickest way to kill these pests is to pick them off, squish them or put them in a container of soapy water, or even rubbing alcohol. The larva feed for about a month, so be patient.
​

​For infestations where picking them off an option, spray them off with a forceful stream of water.  You can also use with soap and water, neem oil or horticultural oil. Coat the plant and ground thoroughly. Repeat spraying are needed, every seven days, but do inspect daily and remove any lingering larva. 
Picture
Picture

More on Roses...

Click on the links below:
  • Growing Roses Successfully
  • Types of Roses
  • Easy Roses
  • Climbing Roses
  • Portland Rose Test Garden
  • Rose Insects & Diseases
  • Pruning Roses
  • Rose Sawfly

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  • Home
  • About, Services, Contact
  • Ask Amanda
  • Roses
    • Types of Roses
    • Easy Roses
    • Climbing Roses
    • Portland's Rose Test Garden
    • Rose Insects & Diseases
    • Pruning Roses
    • Rose Sawfly
    • Rose Bloom Balling
  • Pruning Basics 101
    • Pruning Tools
    • Winter Pruning
    • Pruning Grapes
    • Pruning Clematis
    • Prune Your Own Garden Registration
  • Lawn Basics
    • Lawn Reno, Seed & Sod
    • Lawn Maintenance Schedule
    • Spring Lawn Care
    • Moss in Lawns
    • Lawn Alternatives
    • Lawn Grub Control
  • Mulch & Mulching
    • Living Mulches - Groundcovers
  • Propagation
    • Growing Seeds Outdoors
    • Growing Seeds Indoors
    • Taking Cuttings
    • Seed & Plant Catalogues
  • How to Garden Topics
    • Fall Garden Chores
    • Planting Know-How
    • Soil Building
    • Watering Tips & Techniques
    • Drought Gardening
    • Sheet Mulching, Lasagna Gardening
    • Cover Crops
    • Composting
    • Compost Tea
    • Houseplant Winter Care
    • Hummingbirds in Winter
    • Winterize Your Garden
    • Ponds in Winter
  • Growing Food
    • Spring Veggie Gardening
    • Crop Rotation, Succession & Companion Planting
    • Harvesting
    • Growing Potatoes
    • Winter Veggie Gardening
    • Taming Tomatoes
    • Speeding up Tomato Harvest
    • Tomato Tips
    • Saving Tomato Seeds
    • Tomato Troubles
  • Plant Pests 1
    • Plant Pests Part 2 - Controlling Insects
    • Garden Inspections
    • Helping Pollinators
    • Dogwood Anthracnose
    • Viburnum Leaf Beetle
    • Dormant Oil/Lime Sulfur
    • Japanese Beetles
    • Peony Blotch/Measles
    • Slugs & Snails
    • Horsetail, the Weed
    • June Beetle
    • Powdery Mildew
    • Soil Solarization
    • Rhododendron Leaf Spot
    • Plant Rusts
    • Black Knot
  • Container Growing
    • Choosing a Container
  • Feeding Plants 101
    • Fertilizers & Ratios
    • Nutritional Deficiencies & Toxicities
    • Organic Plant Food
  • Plant of the Month
    • Spring Flowering Bulbs
    • Colourful Fall Plants
    • Abelia
    • American Sweetgum
    • Ash (Fraxinus) Trees
    • Astilbes
    • Aubretia, Rock Cress
    • Aucuba, Japanese Spotted Laurel
    • Autumn Crocus
    • Bear's Breeches
    • Beautyberry, Callicarpa
    • Black-eyed Susans
    • Bleeding Heart, Lamprocapnos spectabilis
    • Calla Lilies
    • Dahlias
    • Daylily
    • Delphiniums
    • Devil's Walking Stick, Aralia spinosa
    • Dwarf Alberta Spruce
    • Dwarf Burning Bush
    • Fall Asters
    • Flowering Currants
    • Flowering Quince
    • Fritillaria
    • Garden Peonies
    • Garden Phlox
    • Ginkgo biloba
    • Grape-hyacinths
    • Handkerchief or Dove Tree
    • Harry Lauder's Walking Stick
    • Heathers
    • Hellebores, Lenten roses
    • Himalayan Sweet Box
    • Jack-in-the-pulpit, Cobra Lily
    • Japanese Anemones
    • Japanese Forest Grass
    • Japanese Maples
    • Japanese Skimmia
    • Japanese Spurge
    • Laurustinus viburnum
    • Lavenders
    • Lily-of-the-Valley Shrub, Pieris japonica
    • Mediterranean Spurge
    • Mexican Mock Orange
    • Montana Clematis
    • Mountain Ash
    • Oriental Poppies
    • Oriental Lilies
    • Paperbark Maple
    • Pink Dawn Bodnant Viburnum
    • Poinsettias
    • Oregon Grape Holly
    • Ornamental Kale
    • Peruvian Lily, Alstroemeria
    • Phalaenopsis, Moth Orchids
    • Persian Silk Tree
    • Portuguese Laurel
    • Rose of Sharon
    • Sneezeweed, Helenium
    • Snowberry
    • Snowdrops
    • Star Magnolia
    • Strawberry Tree, Pacific Madrone
    • Stewartia
    • Torch Lily, Kniphofia uvaria
    • Tree Peonies
    • Tuberous Begonias
    • Virginia Creeper
    • Weigela
    • Winterhazel, Corylopsis
    • Winter Camellia, C. sasanqua
    • Wintergreen, Gaultheria procumbens
    • Witch Hazel
    • Wood Anemones
    • Yews
  • Garden Tour Blogs
  • Monthly Flower Arrangements
  • Website Index
  • Subscribe
  • Need Help?