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Roses

PestsDiseasesCultural Disorders
 
 

 

 

 

 


PESTS ON ROSES
Select the pest from the images below for more information:

AphidsLeaf Cutter BeeRose CurculioRose Slug SawflySpider Mites

 

 

 

 

 


Aphids
AphidsAphids

Plants affected:  Numerous indoor and outdoor plants

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

Life Cycle:  Eggs hatch on host plants in spring, these nymphs give birth to ‘daughters’, within days the daughters give birth - up to 30 generations per summer

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

Chemical Control:  Doktor Doom House and Garden, End All, Ambush


Leaf Cutter Bees

Leaf Cutter BeePlants Affected:  Rose, Lilac, Ash, Virginia Creeper.

Symptoms:
Half moon shapes cut out of leaves
• Use leaves to seal eggs into the cells of the hive.

Life Cycle:
• Adults emerge from overwintering pupa in spring to rebuild nests.

Adults may pollinate garden crops - do pollinate alfalfa.

Cultural Control:  Not necessary, bees are beneficial!


Rose Curcuilio

Rose CurculioPlants affected:  Rose

Symptoms:  Rose flowers will have petals riddled with small holes and wilted buds that have had their stems damaged. 

Life Cycle:
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.

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

Chemical Control:  If problem is suspected to be severe, spray plants with Doktor Doom House/Garden Garden residual insecticide.


Rose Slug Sawfly

Rose Slug SawflyRose Slug SawflyPlants affected:  Roses

Symptoms:
• Skeletonized leaves
Holes eaten in the leaves

Life Cycle:
• Adult sawfly emerge in early spring and lay eggs on the underside of the host plant leaves
• Larvae appear several weeks later and feed on the leaf tissue
• Drop in to soil to pupate

Cultural Control:
• Pick off affected leaves and discard, hose off with a strong jet of water
• Diatomaceous earth

Chemical Control:  Insecticidal soap, Doktor Doom House and Garden


Spider Mites

Spider MitesSpider MitesPlants affected:  Numerous indoor and outdoor plants

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, in greenhouses
Become active in spring as foliage emerges

Cultural Control:
• Lacewings are natural predators
• Keep plants misted (they prefer dry conditions)
• Fall debris cleanup

Chemical Control:  End All, Doktor Doom House and Garden, Ambush


DISEASES
Select the disease from the images below for more information:

Leaf SpotPowdery MildewRust

 

 

 

 

 


Leaf Spot on Roses

Leaf Spot on RosesPlants affected: Roses
 
Symptoms: Black spots appear on upper leaf surfaces, leaves eventually drop
 
Life Cycle:
• Overwinters in diseased canes and leaf debris beneath plants
• In spring, spores are spread by splashing water/rain. Fungal spores require 7 hours of moisture for infection to occur. Once infection occurs black spots start to develop.

Cultural Control:
• Remove diseased leaves
• Prune roses to ensure good air circulation, do not water foliage (water base of plant)

Chemical Control:  Natria, Copper, Sulphur applied as preventative every 7-10 days


Powdery Mildew

Powdery MildewPowdery MildewPlants Affected: Many perennials and annuals, popular hosts include garden phlox, speedwell, salvia, begonias, impatiens

Symptoms :
• White powdery spots, yellowing leaves
• Plants cannot manufacture as much food as they need - severe infestations will kill plants such as begonia

Life Cycle:  Specific spores (black spherical ones) overwinter on leaf debris and soil. High humidity favours spore production, while low humidity favours spore maturation and release.

Cultural Control:
• Good circulation, full sun
• Clean up debris in fall

Chemical Controls: Sulphur and Natria - apply in mid-June as a preventative


Rust

RustRustPlants Affected: Perennials, roses

Symptoms :
• Reddish orange spots on leaves and stems
• Wilting and defoliation follows

Life Cycle:  Spores overwinter on leaf debris and any dead/dying canes

Cultural Control: Prune out, good fall cleanup

Chemical Controls: Sulphur