what causes new growth to turn brown and die?

10 years ago

I'm having this problem on a widespread basis. I've been spraying with Honor Guard in case it's a fungus but I can't seem to get a handle on it. All the new growth my roses (bands and established bushes) are putting out is turning brown or even black, shriveling up, and dying.

Can botritis cause this? I don't have any blackspot or PM to be noticed on any of the established leaves, but the flowers I am getting have been affected by botritis with the cool fog we've had. I thought spraying would take care of it but...no go.

Thanks, everybody.

Sort by:Oldest

Comments (6)

seil zone 6b MI
10 years ago
Have you had any frosts? It could just be frost bite. Tender new growth is the most susceptible to freezing.
kentucky_rose zone 6
10 years ago
Midge?
Related Professionals
Panama City Landscape Architects & Landscape Designers · Roosevelt Landscape Architects & Landscape Designers · Surprise Landscape Contractors · Bridgeview Landscape Contractors · Choctaw Landscape Contractors · Dallas Landscape Contractors · Eureka Landscape Contractors · Lemont Landscape Contractors · Pahrump Landscape Contractors · Plainview Landscape Contractors · Rio Linda Landscape Contractors · Rockwall Landscape Contractors · Markham Landscape Contractors · Reisterstown Landscape Contractors · Winter Gardens Landscape Contractors
racin_rose
Original Author
10 years ago
No frosts as of yet. It would make total sense...

I will have to look up midges...

I need to get some photos up.
dublinbay z6 (KS)
10 years ago
Spider mites?

Overwatering?

Yes, pics would help.

Kate
racin_rose
Original Author
10 years ago
I have been fighting spider mites!!!!
Will they destroy the tiny new growth when it first pops out from the bud-eye?

I will get some pics tomorrow in the daylight.
harborrose_pnw
10 years ago
About rose midge - This insect is less than 1/8 of an inch long; it lays eggs on new growth and under the sepals of buds. They hatch and feed on the new growth causing it to turn brown and die. Buds don't develop. In about a week the midge falls to the ground and emerge from cocoons as adults to start the cycle all over. There won't be many blooms in a garden with midge as most of the buds will be destroyed. The first sign of a midge infestation is a tiny crisp, burnt like piece of foliage at the tip of new growth. Also, the very top leaf is usually distorted.

Here's a link to Baldo's site on rose midge with some pictures. It is an old page as it mentions diazinon as a treatment, which has been banned, but the pictures are helpful.

Oregon State Univ also has a good page with pictures and more up to date treatments-

http://oregonstate.edu/dept/nurspest/rose_midge.htm

A friend of mine has rose midge; she didn't want to use a chemical control so destroyed most of her roses hoping to replant in a couple of years. the cultural controls she tried didn't work for her. Also, there have been some discussions on rose midge here as a number of people have dealt with it. If you search you can find old threads discussing it.

Disclaimer: I know the above only by reading, I've not seen it myself. I've also read pesticide burn can look like rose midge, but that's probably not a problem in your garden? Gean

Here is a link that might be useful: Baldo Villegas, rose midge pictures