The leafhoppers are a family (Cicadellidae) of

Sap is a fluid that circulates through a plant's vascular system, in a similar way to blood moving through our veins. Phloem sap carries the sugars produced in the leaves by photosynthesis down to roots and other storage organs, as well as carrying minerals and hormones. Xylem sap is watery and transports nutrients absorbed by the roots upwards to the rest of the plant. Some plants leak sap from wounds or pruning cuts, and this is known as bleeding.

Although the mottling can be obvious roses are often able to withstand large leafhopper populations and where possible damage can be tolerated and treated as part of garden biodiversity. These insects have many natural enemies and in many cases natural processes will limit damage. 

Check roses frequently from spring onwards so action can be taken before a damaging population has developed. When choosing control options you can minimise harm to non-target animals by using the methods in the non-pesticide section below. Pesticide treatments are likely to kill natural enemies and are only likely to be successful if the entire plant can be reached.

Non-pesticide

• Tolerate the mottling caused by rose leafhopper it often has no effect on plant vigour or flowering, and the insect is part of the biodiversity gardens  support
• Encourage predators and other natural enemies of leafhoppers, in the garden, such as birds, ladybirds, wasps and ground beetles

Pesticides

The RHS recommends that you don't use pesticides. Most pesticides (including organic types) reduce biodiversity, including natural enemies, impact soil health and have wider adverse environmental effects.
 
Where you cannot tolerate rose leafhoppers, manage them using the information above as your first course of action.
 
Pesticide treatments are likely to kill natural enemies and so reduce the likelihood of natural control and can lead to resurgence of the target animal.
 
If you do decide to use pesticides, the shorter persistence products (that are usually certified for organic growing) are likely to be less damaging to non-target wildlife.
 
The pesticides listed are legally available in the UK. This information is provided to avoid misuse of legal products and the use of unauthorised and untested products, which potentially has more serious consequences for the environment and wildlife than when products are used legally.
 
Always follow the instructions on the products. For edible plants, make sure the food plant is listed on the label and follow instructions on maximum number of applications, spray interval and harvest interval.
 
Homemade products are not recommended as they are unregulated and usually untested.
Be aware that products such as Neem oil are not registered for use in the UK and we cannot advise on their use.
 
Plants in flower must not be sprayed due to the danger to bees and other pollinating insects.

• Organic sprays, such as natural pyrethrum (e.g. Bug Clear Ultra 2, Neudorff Bug Free Bug and Larvae Killer) or plant oils (e.g. Vitax Plant Guard Pest & Disease Control, Bug Clear Fruit & Veg, Vitax Rose Guard) have a largely physical mode of action. These are broad spectrum so will kill a wide range of insects. Several applications of these short persistence products may be necessary to give good control. Plant oil and fatty acid products are less likely to affect larger insects
• Plant invigorators combine nutrients to stimulate plant growth with surfactants or fatty acids that have a physical mode of action against lacebugs (e.g. Ecofective Bug Control, Growing Success Bug Stop, SB Plant Invigorator and RoseClear 3 in 1 Action). These products contain some synthetic ingredients and so are not considered organic
• Further information about the use of pesticides available for management of pieris lacebug is available on the pesticides for gardeners leaflet

Download

Pesticides for gardeners (link downloads pdf document outlining pesticides available to gardeners)

The pale yellow adult rose leafhoppers are 3.5-4mm long and sit with their wings folded back over their bodies. When disturbed, the adults readily jump and fly short distances. The leafhoppers overwinter as eggs inserted in the leaves and young shoots which hatch in May. The creamy white immature stages, known as nymphs, then begin to feed on the lower leaf surface. They reach the adult stage in July and lay eggs which hatch to produce a second generation.  Overwintering eggs are laid in the autumn but in mild areas the adults may live until late winter.