BROWN RUST COLOURED AREAS ON LEAVES

The first signs are yellow spots on the top surface of leaves and if you look at the lower surface you will see a fine, dusty, orange coloured area. The orange dust becomes more raised as the disease progresses and may well appear on the top surface as well. The plants looks generally unwell and the leaves begin to fall off. This is most definitely Fuchsia Rust and it is caused by a fungus called Pucciniastrum epilobii.

Fuchsia rust on underside of leaf

Where the plants are grown in the open it will normally appear from July to September but greenhouse fuchsias can be affected at any time of the year. The disease is is spread when the fungal spots mature and give off spores which spread to other leaves and plants by wind.

Fuchsia rust on upper surface of leaf
Picture courtesy of reader Maureen Bridge

To treat fuchsia rust pick off any affected leaves on the plant and all leaves which have fallen off naturally, destroy by burning. Rust is often a sign that the plants are not in good condition so ensure they have the correct amount of water. This fungus also thrives on lush green growth so do not feed fuchsias with nitrogen fertilisers, rather use a tomato plant food.

Be very wary of accepting gifts of plants from friends, this is a very common method for the infection to be spread from one garden to another. Quarantine new plants for three weeks if possible, at the very least keep them away from from healthy plants for two or three weeks until you are sure they are clear of infection.

There are no sprays specifically for fuchsia rust but fungicides to cure rose rust can work well. Remember to spray the undersides of leaves as well as the tops. If you want to know more about rust check out our in depth article on allium rust, it is one and the same disease which attacks fuchsias.

LEAF EDGES EATEN, PLANT HEALTH POOR

These are classic signs of the VINE WEEVIL which is one of the plagues of the fuchsia grower both professional and amateur. The vine weevil doesn’t only attack fuchsias, it goes for a wide range of ornamental flowers, fruits and vegetables and it’s becoming more and more common in the UK.

This pest has two stages of life, the adult beetle which eats the edges of leaves and the far more devastating grubs which lurk just below the soil surface and eat the roots.

We have written an in depth article about the wine weevil, how to recognise it and how to treat and we suggest you visit that page here. But before you go there a couple of words of advice especially relevant to fuchsias. This pest loves fuchsia roots and especially so in pots, the open texture of the compost suits its lifestyle ideally.

The eggs are laid from May to September but in greenhouses and heated buildings pot plants can be affected at almost any time of the year. The only way you will notice the damage the grubs do (before your plants keel over and die) is by turning the pots over and inspecting the roots. Look for white healthy root balls and no signs of the grubs as shown in the photo above.

Far better though, and easier, is to keep a check on the leaves from March to August. If there is any damage to the edges of the leaves immediately suspect that the damage has been caused by the adult vine weevil beetle (see picture below) and take action as per our in depth article immediately.

LEAVES DISTORTED, FLOWERING FAILS (FUCHSIA GALL MITE)

These are key symptoms of Fuchsia Gall Mite (Aculops fuchsiae). The foliage near the ends of stems is curled and distorted, some of the leaves have a red or pink tinge to them. The flowers are also distorted and fail to develop properly. The damage is first seen in late May and it will continue to increase in severity through to late September until all the leaves and flowers are a distorted mass. The mites themselves are very small, between 0.2mm and 0.25mm long which makes them almost invisible to the naked eye.

Copyright Fredon Bretagne

Fuchsia Gall Mite originally only affected plants near the South coast of England but as of 2016 / 17 it has now spread north as the map below shows.

It seems likely that within the next ten years it will have spread much further north in the United Kingdom. It is spread through air on wind and through insects moving from an infected plant.

When the pest was first found in the UK in 2007 it was classified by the Food and Environmental Research Agency (FERA) as a notifiable pest, even in private gardens. In 2011 this reporting requirement was lifted although it still remains in force for garden centres and similar commercial businesses.

HOW TO TREAT FUCHSIA GALL MITE

There are manual actions you can take to control Fuchsia Gall Mite although unfortunately there are no nematodes which work against them. The following course of action is recommended:

• The mites are extremely easy to transfer from one plant to another on your hands. If you touch an infected plant wash your hands thoroughly (and any knives etc. used) before doing anything else.
• Clear up all fallen debris around the plant including leaves, stems and flowers. Destroy by burning.
• Cut off all infected growth and destroy by burning. If this means that there is very little left of the plant then it is best to dispose of it completely.

INSECTICIDE SPRAYING SCHEDULE
Originally in 2010 the RHS claimed that that there were no sprays that could be used against Fuchsia Gall Mite by amateur gardeners but they then admitted that they may be wrong. Westland Plant Rescue Bug Killer for Ornamental Plants contains two chemicals, abamectin and thiamethoxam, which do appear to offer some hope for gardeners especially when applied in a specific way. Unfortunately this spray was withdrawn from sale in 2013 with no replacement offered.

It is known that this mite prefers cool conditions and there have been experiments which subjected infected plants to high temperatures to see how this affected the mites. Unfortunately they are only sufficiently affected at temperatures which also kill the plants.

Although they prefer cool conditions, there is some evidence that gall mite do not survive temperatures below 5°C / 41°F for long. This is of course only useful information if you have hardy fuchsias and even so, it is by no means proven.

For those affected by Fuchsia Gall Mite the RHS produced a publication in 2014 which contains the most up to date information. It does not make encouraging reading.

CAPSID BUG

Damage from Capsid Bugs is almost always noticed after the bug has disappeared and started to damage another plants. The flowers will show damage to the edges when they emerge, sometimes with holes in the petals. The leaves are also often attacked and show small holes in them which can be quite extensive. They are most common from May to  August.

If you suspect that Capsid Bugs will damage your fuchsias then spray regularly with an insecticide such as Scotts Bug Clear or Doff All-in-One Garden Pest Killer.

LEARN HOW TO CARE FOR FUCHSIAS

CALENDAR	TAKING CUTTINGS
PINCHING OUT	FUCHSIA CARE
PEST, DISEASE	STANDARD FUCHSIAS
OVER-WINTER