Unusual growth on D/A Lady Emma Hamilton shrub rose.

Good morning @Joolz my friend yes its a Gaul of some type. 1.Rose Crown Gall.
2 A Bedeguar Gall (also known as Robin's Pincushion) I have only seen this on a Dog Rose and only once before,I need to go and do some research on this so that I can give you the correct advice my friend,bear with me and feel free to google it so you have some idea what we are dealing with

How Galls Get Started:
Bacterial galls are tumors caused by a critter called Agrobacterium.

• Crown galls, those tumors which attack the root crown of the plant near the soil's surface, are produced by A. tumefaciens.
• Cane and stem galls are produced by A. rubi.

These bacteria live in the soil and can survive long periods of adverse conditions in soil debris or within the systemic fluids of the plant. When the plant is wounded, the bacteria enter the tissues and form a soft, spongy tumor. The bacteria proliferate on the outer surfaces of the tumor. As the gall hardens, some of these outer tissues are sloughed to the ground carrying with them more bacteria which then re-infect previously non-infected, wounded areas of the plant.


Susceptible Soil Conditions
If you have acidic soil, consider yourself lucky. A. tumefaciens does not do well in acidic soil. The bacteria is most prevalent in late spring when soils are moist.

How Plants Get Wounded
The wounds can be caused by pruning, digging, freeze injury, improper fertilization or irrigation causing cracked stems, and even pest insect damage.

 

Hi @Joolz I will put my head on the block and say that it is in my opinion it is Robin's Pincushion and caused by the Gall Wasp it causes no detectable harm and can be retained as a curiosity or cut off and burn


They look like a tangle of red and yellowy green filaments making a brightly coloured pom-pom on the rose stem.

Like many galls, they are caused by a little wasp and although the galls are very conspicuous, the wasps are very inconspicuous. The female wasps can reproduce without males and, maybe consequentially, males are quite rare.

Inside the pincushion gall there will be several wasp grubs that will pass the winter within feeding on plant tissue. The larvae somehow control the plant tissue around them causing it to form big, juicy cells which are continuously replenished. In the spring new wasps will emerge: mostly they will be females and without the need for males, they will be able to go and lay eggs in rose bushes to start the cycle again.

One of the alternative names for the gall, bedeguar, is said to originate from the Persian language and means brought by the wind.

The galls are unlikely to be a problem in gardens except on wild-type roses. They can be valued for their own attractiveness and interest and generally they will not cause harm to their host plant. However, if you really don’t like them, just snip them off.





A robin’s pincushion or bedeguar gall rose

Lady Emma Hamilton
Orange or orange-red Shrub.
Registration name:AUSbrothe
Exhibition name: Lady Emma Hamilton
Bred byDavid C H Austin(United Kingdom, 2005).
Introduced in United States by David Austin Roses limited (USA) in 2007 as 'Lady Emma Hamilton'.
Shrub. English Rose Collection.
Orange blend. Strong, fruity, geranium, tea fragrance. Average diameter 3.5". Medium, very full (41+ petals), cluster-flowered, cupped, globular, old-fashioned bloom form. Blooms in flushes throughout the season.
Medium, bushy.
Height of up to 4' (up to 120 cm). Width of up to 3' (up to 90 cm).