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Insect Pests on Roses

 

Aphid
Pear Slug
Rose Curculio or Rose Weevil
Rose Slug Sawfly
Spider Mites

 


 
 
 
 
 
 
Aphid

Symptoms - Severe infestations will cause curling/twisting of foliage, flowers to wilt and drop.

Controls - Cultural or Non-chemical:

  • Ladybird beetles/larvae, lacewings are natural predators.
  • Strong jet of water to knock aphids off plants.

Controls - Chemical:

  • Insecticidal soap, Doktor Doom House and Garden, and various other insecticides.

 

 
 
 
 
 
 
Pear Slug

Plants Affected - Fruit trees, Cotoneaster, Mountain Ash, Hawthorn.

Symptoms - Leaf skeletonizing in mid to late June, and again late July/August.

Life Cycle:

  • Adults emerge in spring when trees leaf out.
  • Eggs are deposited between leaf layers, larvae then feed on upper leaf layer.
  • In August larvae drop to ground, pupate. Second generation of adults emerge late July and lay eggs again, these larvae cause the most damage. Mature larvae drop to ground in fall, pupate and overwinter.

Cultural Control - Pick off larvae, hose off with strong jet of water.

Chemical Control - Not recommended—birds, parasitic wasps control these. If you choose to spray; Safer’s 3 in 1 Garden Spray.


Rose Curcuilio or Rose Weevil

Symptoms:

  • Rose flowers will have petals riddled with small holes and wilted buds that have had their stems damaged. Adults drill holes into buds to lay eggs.  Eggs hatch and larvae feed on inside of flower buds/rose hips.
  • Affected buds/fruit fall off in autumn, larvae emerge and overwinter in soil.  Larvae   pupate in spring, adult beetle emerges shortly after.  

Controls - Cultural or Non-Chemical:

  • Prune away infected buds/fruit, clean up any debris on ground early in fall. 

Controls - Chemical:

  • If problem is suspected to be severe, spray plants with Doktor Doom House and Garden residual insecticide.

 

 
 
 
 
 
Rose Slug Sawfly

Symptoms:

  • Leaves appear to have translucent holes where young have eaten from only one side.
  • Young are soft, yellow-green and slug-like insects up to 15 mm long.
  • Damage appears between May and September.

Controls - Cultural or Non-chemical:

  • Pick off affected leaves and discard.
  • Hose off with a strong jet of water from nozzle.

Controls - Chemical:

  • Insecticidal Soap, Trounce or Doktor Doom House and Garden
  • Malathion can be used as well.

 

 
 
 
 
 
Spider Mites

Plants Affected - numerous

Symptoms:

  • Stippling - tiny dots in foliage
  • Yellowing of foliage - 'haze' on foliage

Life Cycle:

  • Can overwinter in various stages, under debris or bark on host plants.
  • Become active in spring as foliage emerges.

Controls - Cultural or Non-chemical:

  • Lacewings are natural predators.
  • Keep plants misted.
  • Cleanup fall debri.

Controls - Chemical:

  • End All, Doktor Doom, Ambush