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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


CULTURAL DISORDERS
Disorders are plant abnormalities that are caused by environmental factors such as nutrient availability or temperature (not pests or diseases). Typically, disorders may make your plant look different than expected but unless severe, are not usually overly harmful.
Select the disorder from the images below for more information:

 

ChlorosisHerbicide damageOverwateringUnderwatering

 

 

 

 

 

 


Chlorosis
Chlorosis

Symptoms:
• leaves are yellow but veins remain green, may be some browning on the margins of leaves
• will be evident first on new growth, then work back to older leaves on a branch

Control:
• ensure loose, well-drained soil, avoid overwatering
• high soil alkalinity can also be a cause, plants can be fertilized with iron chelate for recovery


Herbicide Damage

Herbicidal DamageSymptoms:
• curling or cupping leaves
• discoloration between veins
• twisted, elongated stems

Control:
• use all herbicides according to label, note that herbicide can drift for several miles, it’s very difficult to ascertain where chemical drifts from
• keep damaged plants well-watered, most plants will recover


Overwatering

OverwateringSymptoms:
• wilting, yellowing leaves
• leaves will yellow from outside in
• Note: wilting is a symptom of BOTH over and underwatering, if plants are wilting don’t assume they require moisture until soil is checked by hand

Controls:
• plants in lower lying areas will suffer in times of heavy rains; plant appropriate species in these areas
• for new and established plants, water only as required; check soil prior to watering

 


Underwatering

UnderwateringSymptoms:
• wilting, crispy or browned leaf edges

Controls:
• water, especially for new transplants should be monitored daily during periods of extreme heat
• for new transplants, stick your hand into the soil to determine if moisture is required