As it turns out, our undying love for roses is shared with a handful of pesky critters. While most common rose pests are just unsightly nuisances, they can do significant damage to leaves, foliage, and canes if left unchecked.
With early identification and prompt treatment, you can easily manage and eliminate infestations before they get out of control. We’ll walk through identifying and treating common rose pests, and what you can do to prevent them in the first place.
How to Tell the Difference Between Rose Pests and Rose Diseases
When you first notice damage to the buds and foliage on your rose, it’s not always immediately clear if the culprit is a pest or disease. Pest damage is typically caused by insects feeding on plant tissue, resulting in:
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Holes
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Skeletonized leaves
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Distorted buds
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Sticky residue
Common rose diseases tend to manifest as:
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Spots
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Mold
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Discoloration
The Most Common Rose Bush Pests
While some treatments overlap, different rose pests require different control methods. Let’s walk through pest-by-pest identification and treatment: how to spot them and how to eliminate them.
Aphids
These small, soft-bodied insects are the pests you’re most likely to find sucking the sap out of your rose. Typically green, pink, or reddish-brown, they cluster on tender new growth, stem tips, and flower buds.
Signs of an aphid infestation include:
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Puckered or curling leaves
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Distorted buds
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Sooty mold - aphids excrete honeydew that leaves a sticky black residue on leaf surfaces.
With the ability of females to reproduce entirely on their own, aphid populations multiply rapidly – producing several generations of live young within weeks. While this may sound alarming, aphid infestations are simple to control when caught early. A few effective methods include:
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Water blast: A strong spray from a garden hose will dislodge the insects from the plant tissue.
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Insecticidal soap: An organic treatment that quickly suffocates aphids. Spray directly onto infested areas in early mornings or evenings – repeating every 7-10 days until the infestation is controlled.
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Neem oil: A natural pesticide that interrupts that not only kills aphids, but disrupts their life cycle so they cannot reproduce. Neem oil can be applied to infested areas the same way as insecticidal soap.
*Attracting beneficial insects into your garden is one of the best methods of natural pest control. These rose-friendly critters prey on the harmful ones, bringing light infestations under control within just a couple weeks.
Japanese Beetles
Japanese beetles are easily recognized by their metallic green bodies, coppery bronze wings, and small white dots along the outer abdomen – typically ⅓ to ½ an inch long. Adults emerge from the soil in late spring and early summer during daylight hours to feed on rose buds and blossoms.
Signs of a Japanese beetle infestation include:
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Skeletonized leaves
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Damaged flowers with holes or ragged edges
Japanese beetles are generous: they release pheromones signaling other beetles to join in on the flower feast. This causes damage to escalate quickly over their 4-6 week active period. But with early detection, it’s nothing that can’t be controlled. The most effective methods include:
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Handpicking: If the infestation is small, simply pluck the beetles off your rose and drop them into a bucket of soapy water. If touching them irks you, gently shake the rose bush and let them fall into the bucket.
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Cover rose bushes: Place fine netting or tulle over individual bushes or blooms during peak beetle season as a protective barrier.
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Neem oil: Similar to aphids, neem oil disrupts the hormones of Japanese beetles – causing them to slowly stop feeding and laying eggs.
*Applying Milky Spore directly into the soil is effective at reducing adult populations for following seasons. This is a long-term prevention method, not a quick fix.
Rose Chafers
Rose chafers are metallic green or tan beetles measuring about 3/4 inch long – most easily identified by their spiky red-orange legs. They emerge from sandy soil in late spring to devour plant tissue.
Signs of a rose chafer infestation include:
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Large, irregular holes in rose petals
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Skeletonized leaves – veins are left intact and the tissue in between them is eaten.
The best ways to control a rose chafer infestation include:
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Handpicking: If present in small numbers, pluck rose chafers off your rose and drop them in a bucket of soapy water. Or gently shake your rose bush until they fall into the bucket.
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Covering rose bushes: Place a protective netting over vulnerable blooms during peak emergence.
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Avoiding sandy planting sites: Rose chafers love sand, where they can easily burrow and lay eggs. If possible, choose a planting site far away from sandy areas to minimize chances of an infestation.
CAUTION: Rose chafers are poisonous to small birds and mammals if consumed – including chickens. Gardeners with backyard flocks should regularly inspect their roses to keep their animals safe.
Rose Slugs (Rose Sawfly Larvae)
Despite their name, rose slugs are the offspring of rose sawflies – not true slugs. They resemble small caterpillars with yellowish-green bodies that can measure up to 3/4 inch long. From mid-spring onward, multiple generations hatch and emerge at night to feed on the underside of rose leaves.
With rose slugs, you’ll typically spot damage before the actual pest. Signs of a rose slug infestation include:
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Thin, translucent papery patches on leaves.
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Skeletonized leaves with green veins left behind.
When dealing with rose slugs, early intervention is key before populations build. The most effective ways to control a rose slug infestation include:
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Regular inspection: Check the undersides of leaves for eggs and larvae every few days during the growing season.
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Handpicking: Use gloves to squish rose slugs and rub them off the leaves.
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Water burst: An effective alternative for those squeamish about handpicking. Rose slugs can be sprayed off with a hard, direct jet from a garden hose.
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Organic insecticides: Apply insecticidal soap or neem oil directly to the affected leaf surfaces.
Scale Insects
Scale insects appear as grayish-white or brown bumps with a waxy coating along rose canes. These sap-sucking insects can weaken a rose to the point of cane dieback. They can be easy to miss until infestations become established.
Signs of a scale insect infestation include:
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Restricted growth
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Reduced flowering
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Yellowing foliage
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Cane dieback
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Sooty mold on surrounding foliage (similar to aphids) due to honeydew excretion
The best ways to control a scale insect infestation include:
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Hand removal: Light infestations can be gently scraped off with a fingernail or dull knife.
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Horticultural oil: Apply during the crawler stage (typically mid-June) approximately 4 weeks after hatching. This will smother the insects before their hard coating forms. To target overwintering adults, apply at higher concentrations during the dormant season.
Spider Mites
Spider mites are extraordinarily tiny – measuring about 1/50th of an inch. To the naked eye, they appear as slow-moving dots or specks of dust. They congregate on the undersides of rose leaves and drain chlorophyll from the plant tissue.
Signs of a spider mite infestation include:
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Tiny yellow stippling on leaf surfaces
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Delicate webbing across affected areas
The best ways to control a spider mite infestation include:
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Water burst: For light infestations, target leaf undersides with strong sprays from a garden hose.
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Neem oil/insecticidal soap: Highly effective for moderate infestations. Apply to the undersides of leaves where spider mites gather.
The best ways to prevent future spider mite infestations include:
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Maintaining humidity around rose beds: Infestations worsen in hot, dry, and dusty conditions.
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Minimizing pesticide use: Pesticides can harm natural predatory mites that feed on harmful ones.
Thrips
Thrips are slender, brown-colored winged insects that suck the sap out of rose buds and petals. They’re extremely tiny – barely the size of a grain of rice at maturity.
Signs of a thrip infestation include:
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Brown streaks on petals
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Discolored/distorted petals
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Buds that fail to open properly
The best ways to control a thrip infestation include:
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Pruning: If caught early, a thrip infestation can be halted by snipping off infested blooms and disposing of them in a sealed bag.
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Spinosad: A highly effective organic treatment that disrupts the thrip life cycle.
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Neem oil/insecticidal soap: Organic treatments that kill adult thrips on contact.
*Tall grasses and deep mulch piles are prime hiding spots for thrips. Keep surrounding grass trimmed short and maintain a safe distance between rose bushes and mulch piles.
Slugs
Not to be confused with rose slugs, true slugs are mollusks – not insects. They typically feed on roses at night in wet or humid conditions.
Signs of a slug infestation include:
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Ragged-edged holes in leaves
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Slime trails
*Since slugs are nocturnal, check the garden after dark with a flashlight to catch them in the act.
The best ways to control a slug infestation include:
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Slug baits: Iron-phosphate pellets are effective and significantly safer to use around children and pets than synthetic alternatives.
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Copper tape: This natural deterrent won’t kill slugs, but deliver a mild shock that scares them away. Apply the tape to a plastic ring to place around the base of the rose as a protective barrier.
*Slugs thrive in humid, wet conditions. Water your roses in the morning so the foliage dries by nightfall.
What to Spray on Roses for Pest Control
With the countless rose pesticide options available, it can be difficult to determine which is right for your garden. Let’s narrow it down to the most effective organic spray and conventional methods that are safe for you and your roses.
Neem Oil
Pressed from neem tree seeds, this broad-spectrum organic option inhibits pest feeding and movement while interrupting insect life cycles. It’s highly effective: smothering soft-bodies insects on contact.
Who it works against: Aphids, spider mites, thrips, and rose slugs.
How to use: Coat the entire plant, including leaf undersides. Apply in early mornings or evenings to avoid leaf burn. Reapply after periods of rain.
Insecticidal Soap
Insecticidal soap is a targeted contact-kill option that’s safe for use on most rose pests. It works by dissolving the insects’ cell membranes, leading to dehydration and death.
Who it works against: Aphids, spider mites, and thrips.
How to use: For an effective DIY solution, mix 1 tablespoon of mild liquid soap (not detergent) with 1 quart of water in a spray bottle. Coat the entire plant, spraying the solution directly onto pests in the early mornings or evenings.
Horticultural Oil
Horticultural oil is the go-to treatment for scale insects and overwintering pests. The oil blocks their breathing spores and leads to suffocation.
How to use: Check your product label for precise mixing ratios. To target overwintering adults, apply in higher concentrations during the dormant season. To target crawlers, apply in lower concentrations during the growing season.
*Never spray when temperatures exceed 85F or drop below 40F. Doing so could reduce effectiveness and even harm the plant’s foliage.
Water Sprays
Don’t underestimate the power of water. This humble yet effective first-line defense works particularly well for aphids and spider mites. A strong, controlled stream of water can dislodge rose pests from plant tissue without chemical intervention.
*It’s always best to spray your roses in the early mornings to allow foliage to dry and reduce the risk of disease.
Companion Plants That Help Keep Rose Pests Away
Companion planting is the ultimate rose pest preventative strategy. Certain plants are highly effective at naturally repelling aphids, spider mites, and other unwelcome guests – reducing the need for chemical intervention. Just a few of the most effective rose companions include:
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Alliums (chive & garlic)
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Catmint
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Yarrow
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Sweet alyssum
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Lavender
Plants to Avoid Near Roses
Not all plants are compatible with roses. In fact, there are several that can act as “aphid magnets”. When choosing pest-deterring rose companions, avoid:
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Nightshade vegetables: The succulent, tender growth of potatoes, peppers, and tomatoes are highly attractive to aphids.
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Fennel: Fennel contains high levels of VOCs that draw in aphids – the same aromatic oils that are responsible for producing rose scents and fragrances.
General Tips for Preventing Rose Pests
While there are several options for treating rose pests, it’s best to be proactive rather than reactive. Developing good gardening habits is key to reducing year-round pest pressure. Here’s what you can do to prevent pesky insects from chewing up your beloved roses in the future:
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Inspect regularly: Early detection of pest activity is key to stopping an infestation before it gets out of control.
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Avoid over-fertilization: Heavy fertilization produces tender new growth that aphids love.
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Remove infested areas: Immediately dispose of infested canes or leaves. Composting them will increase the risk of reinfestation.
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Water at the base of the plant in the morning: This avoids creating a damp environment in which many rose pests thrive.
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Maintain good airflow: Pruning your roses properly will improve air circulation and give pests less space to lay eggs and overwinter.
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Keep a tidy garden: Trimming tall grasses and removing debris around rose beds will give thrips and slugs nowhere to hide.
Final Thoughts
When it comes to pest control for roses, early identification and a layered treatment approach is key. Combining targeted treatments, smart companion planting, and good garden hygiene is the most effective way to send rose pests fleeing, never to return. Visit April & Ashley to shop our premium collection of rose bushes – bred for vigor, health, and flourishing garden performance.