catsmum
honoured helper
Castlemaine, Victoria, Australia
deformed rose leaves and powdery mildew
30 Oct '05 6:16 pm ok rose gurus I need help.Spring has sprung and most of my roses are looking great... healthy leaves, buds, and one or two in flower. One however looks a bit odd. Most of it's leaves are healthy enough but there are some that have yellow splotches and some of the leaves look as though they have been 'ruched' or 'gathered up'Any ideas on cause or cure??
btw I'm trying a home made spray for the powdery mildew afflicting the white Banksia rose. Results looking promising so far!
To 1 litre water, add 2 teaspoons bicarb of soda. a drop or 2 of vegetable oil and the same of dishwashing liquid. Apply as a spray liberally. It's supposed to work better as a preventative and needs to be reapplied after rain. Having said that, my rose was heavily coated with the typical white and now after 2 sprays is almost as it should be.
cheers
Susan
Liza
gardening consultant
Waterloo, Belgium
Mildew Disease
2 Nov '05 2:51 am Dear Susan, I'm sorry for your sick Roses!
Certain of my Roses (and some of my Delphiniums as well) are normally sick by Mildew by the late summer weeks. Well, I'm copying from my book:
" MILDEW:
The most widespread rose disease. White poudery mould on leaves and buds --leaf cockling and premature fall take place. Usual time for attack, Summer and early Autumn.
It is encouraged by closed-in conditions, dryness at the roots, poor feeding, and by hot days followed by cold nights.
Spray with Multirose or Systhane at the first signs of disease. Repeat one week later and apply further sprays if the spots reappear.".
Good luck!
Liza.
catsmum
honoured helper
Castlemaine, Victoria, Australia
2 Nov '05 1:42 pm Thanks Liza
The bicarb mix seems to be doing the trick for the powdery mildew,which only seems to affect the 2 Banksia Roses - one white one yellow, but I'm still flummoxed as to what the yellow splotches and deformed leaves are on the other one.
All the other roses are absolutely healthy and more and more buds are opening every day... oh, and the one with the strange leaves, I noticed it's really only on one main branch, the rest is fine and the buds are big and healthy. Maybe I should just cut off that branch and be done with it even tho that will leave the bush a strange shape.
Roses are a mystery to me sometimes. Treat them all the same and some just sulk!
cheers
Susan
Last edited by catsmum on 2 Nov '05 11:53 pm; edited 1 time in total
Liza
gardening consultant
Waterloo, Belgium
Sick branch suffering by Canker disease?
2 Nov '05 9:50 pm Susan!
Watch attentively at the base of this branch. Because it is very probable that a serious disease called "Canker" has infected your Rose at this very point. I'm copying again from my book:
"CANKER:
Usually appears as a dinstict and sunken area close to the bottom of the stem. The edge of the canker maybe swollen and the bark cracked.
The canker fungus enters the stem through a wound caused by insect, or disease attack, or mechanical damage. Be careful when hoeing!
If the canker enlarges and encircles the stem, the whole of the growth above the diseased area will be killed.
Cut down and burn all the diseased wood. Paint large cuts with Arbex. Dip the secateur blades in methylated spirits after use. Apply a balanced compound fertilizer, such as Toprose."
Canker disease has attacked twice my rose garden so far, but following the above advice , I saved my plants.
Good luck!
Liza
catsmum
honoured helper
Castlemaine, Victoria, Australia
2 Nov '05 11:55 pm Shall go out and check first thing tomorrow!
cheers
Susan
