Apologies for this crosspost and lack of a title (no edit function for the title!). For some reason this post ended up in the talkback forum. I've had a few replies which said this is not a fungal infection but stress on the plant. I would like more opinions as to whether I should prune this jasmine at the moment, to make it less dense at the centre and then tie in the very long new growth.
I think my beloved winter jasmine has a fungal infection. It appears to be affecting some of the branches as well as the leaves. I'm not absolutely certain because I can't remember if the leaves change colour like this before dropping.
Also, I have read somewhere about quite a nasty fungus that produces this red colour on leaves and branches. It's been in the ground 3 years now and I've been training it up the arch in the photo'. I pruned it quite hard this spring after it finished flowering to get rid of cross branches and straggly and unproductive ones.
It has responded with a lot of new growth, some of it extending a couple of metres from the centre and it has become quite bushy and dense. I've included some photo's of healthy, dark green leaves for comparison.
So, could anyone confirm that it has a fungal infection, and if so would you cut out all the infected growth. I have sprayed it with a fungicide as a precaution.
And, would people with more knowledge than me cut out some of the central, woodier older growth in the centre and train the longer newer growth. I do know that a plant needs good air circulation to help in avoiding fungal diseases.
In fact, many of my plants have suffered from fungal infections this year, roses, sweet peas, calendula, and hollyhock. I put it down to the very mild and wet winter and spring.