Greenfly, froghopper and rose scale are the main problems you may find on your roses stem. Here are some tips on how to spot and how to be rid of these pests;
How to spot if you have greenflies
Greenfly is the most common and most serious of all rose pests; they can cause growth distortion or completely stop growth, infested buds may fail to open.
Due to these pests being almost naked to the human eye, there are a few telltale signs which you may have noticed on closer inspection:
How to get rid of greenflies?
There are a few organic methods below that you can use before going onto the pesticides; however, if you have a significant infestation its best to sort this out quickly using a pesticide;
The best way to tackle aphids is by looking out for a pesticide containing dimethoate that will go inside the plant, so the spray misses the foliage. Alternative spray with a contact insecticide such as Multi rose, Liquid Derris or Sprayday.
Spraying with Water
Using a hose or placing it in the shower and spraying water over them can knock the aphids off to which they won’t be able to return.
Spraying water will also rinse off some of the honeydew stuck onto it. Keep spraying every day until it is aphid free.
Use Aphid enemies
Another suitable organic method is using the natural aphid enemies against them; this can only really be used in the garden and when the infestation is medium to low.
These enemies are; lacewings or ladybirds/ladybugs who will feed on the sugary aphids, to attract these enemies in plant mint, fennel, dill or dandelions in your garden.
Hopefully, this should stop the aphids from multiplying. You can also try planting onion or garlic near as the smells will deter the aphids.
Neem oil is an excellent use for inside the home; it is safe for children, animals and plants themself. The best way to explain how this works is by using Azadirachtin acting as a repellent and reducing insects from feeding. As well as also disrupting hormonal balance, meaning they moult to the next stage of life.
Pinch them out!
A straightforward but maybe a bit time-consuming method is to pinch these off with your finger or thumb or prune the part of the highly infested plant.
Froghopper, Cuckoo-spit, Philaenus spumarius
How to spot if you have froghopper
Also known as a spittlebug, attacks will take place typically between May-September. Both the larvae and the adults eat away at the plant sap and xylem.
There are many different species of the froghopper which does make them hard to identify, but here are a few telltale signs of the Philaenus spumarius;
How to get rid of froghopper?
Although the effect of froghoppers can be unsightly, the damage is minimal to the plant’s vigour, and they should be considered part of the biodiversity to support the garden. Therefore we would not suggest using chemicals to control them.
If only a few shots are affected, wipe off the froth or spray forcible with water to clear.
Rose Scale (Aulacaspis rosae)
How to spot if you have Rose Scale
Like all other scale insects, this bug feeds on the plant sap. Laying their eggs in July or early August, and are ready to hatch from late August to September.
They will typically attach to the stem of roses that grow in damp, shady areas.
How to get rid of Rose scale?
Large infestations can reduce your plant’s vigour; however, where possible, these can be tolerated – and luckily, unlike other scale insects, this species does not produce honeydew.
We would suggest tackling attacks during mid to late summer when newly-hatched scales are present, making them more vulnerable. Rose scale can be hard to get rid of, so try to do as much to prevent this.
You can remove adults scale and egg masses. Unfortunately, this will not reduce heavy infestations.
Small outbreaks can be controlled by paining affected areas with methylated spirits or neem-based leaf shine.
Prune infested areas
Stems that are infested can be pruned and removed, followed by disposing of them.
Encourage natural predators
Natural predators like ladybirds/ladybugs, parasitoid wasps, hoverflies, and birds should be encouraged into your garden as they eat scale insects.
Last case scenario – Use pesticides
If the above methods do not work on heavy infestations, you can move on to pesticides, Resolva Bug Killer and Bug Clear Ultra. Please be mindful that plants in flower should not be sprayed to harm pollinating insects such as bees.