Disregard- I google searched the topic and will contact TX A & M

I was hoping someone from your parts would have answered by now.

I wondered if your roses arrived containerized and already treated with a systemic anti- fungal with a long duration of action.

I would not have thought that the black spot season near you was finished in May; I’ve never been near Texas though.

Maybe they’re just good roses. Which do you have?

Lynn,

Expect black spot to rear its ugly head, sooner than later. If it's hot and humid during the summer there in Central Texas, you most likely live where black spot pressure is intense. As Rifis noted concerning the possibility of the roses having come treated with a time release black spot fungicide that lasted all season long, there are a number of other reasons that your roses have not developed black spot so far.

The best possible reason is that they are either among the very few varieties of older roses that are black spot resistant, or roses of more recent introduction into commerce that are bred specifically to be essentially black spot free. I hope they are mostly roses from these two groups.

Can you name the varieties that you are growing, so that we can comment upon them potentially presenting future black spot issues?

Moses

Hi,

Thanks for the information. It is actually adding to what I found online.

My roses arrived beginning in late May. I picked up roses from A.R.E. and a relative in Houston during July. During July and August, as the temperatures increased, the humidity dropped down to the 30 percent range. Hotter, less rainfall, decreased humidity. Arriving here from Las Vegas, the weather seemed somewhat pleasant to me.

My initial roses were selected due to their disease resistance reports online. However, there are some roses I grow that are not known for disease resistance and they are of concern. I am not opposed to using neem oil and wonder if it is something I should have sprayed on the roses already.

Candace

Black Magic

Blue Girl was purchased at a big box store

Heirloom was recently purchased bare root at a big box store ( I cannot seem to get all of that wax off!!)

Radio Times-

Marc Chagall

Dee lish

Earth Angel

re: "At what time during the year do you all usually see blackspot on roses?"

January to December, in my case. (not exaggerating)

Spring is usually humid & drizzly, often cloudy & overcast. Many mornings there's dew/mist on the leaves, and not much wind or sun to dry them off. By July & August humidity goes way down and there's extended periods of 20 mph south winds.

In 2019 it got summertime hot by mid-May, and the full blast summer heat stuck around an extra month thru the end of September, due to less early hurricane activity from the Gulf. Winter has been milder than average.

This is 75 miles south of Austin with about 20 roses (chosen for fragrance). I pick off diseased leaves regularly, and after rain will tap the canes to knock off water droplets if there's no wind. Many will still be blooming in December.