Roses forum→Is my Claire Austin a victim to some disease?

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Name: Shyam
San Francisco, CA (Zone 10b)
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Rose_Guy1127
Jun 21, 2018 11:39 AM CST
Morning everyone,
I was watering my rose plants this morning, and I spotted a couple of things on my Claire Austin. Being a rose novice, I am seeking experienced growers here to help me determine two things:

1) The spots (refer to the image) that I see on the foliage. Three-Four foliages have the spots. I have an inkling it's some sort of fungus-related disease? I could be wrong. I don't see other rose plants having the spots. What are these spots, and how can it be treated?

2) A few foliages' tips are dried out as seen in the image. Residing in SF and house facing north, I don't believe the foliage tip withering is due to the heavy sun. And I water them regularly to maintain the soil of right amount of moisture. What am I missing here?

Thanks,
Shyam
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[Last edited by Rose_Guy1127 - Jun 21, 2018 12:01 PM (+)]
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(Zone 6b)
Cat Lover Moon Gardener
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WitchyWV
Jun 21, 2018 6:05 PM CST
Nothing jumps out at me. Wish all my leaves looked that nice. Leaves age, and bugs snack on them. I don't see any black spot disease. Stop and smell the roses. Thumbs up
Name: Shyam
San Francisco, CA (Zone 10b)
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Rose_Guy1127
Jun 21, 2018 11:47 PM CST
WitchyWV said:Nothing jumps out at me. Wish all my leaves looked that nice. Leaves age, and bugs snack on them. I don't see any black spot disease. Stop and smell the roses. Thumbs up


That's an assurance. The plants are only three months old, hence, I am fussing over them until they grow into well-established plants.

A quick question though, is it advisable to wait until the first bloom to feed them fertilizer?
Coastal Southern California (Zone 13a)
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jerijen
Jun 22, 2018 4:53 PM CST
By ALL MEANS wait until after the first bloom to feed. You really can kill a young plant by over fertilizing. Poor baby needs to grow ROOTS -- needs to walk, before it runs.

I think you've been getting a lot of cool foggy weather, right? (I was just there!) So, let the soil dry to the touch before you water again.

Dunno what those white-ish spots are, but you know, I think I'd remove those leaves. The rest just looks like "mechanical" damage, to me.
Name: Bonnie
Texas
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RosesnTx
Jun 22, 2018 7:16 PM CST
I concur with Jeri, I always wait to see new growth and and new blooms before I fertilize a new rose. By letting the roots grow strong your rose will be healthier and able to fight off disease easier, in my experience anyways.
Name: Shyam
San Francisco, CA (Zone 10b)
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Rose_Guy1127
Jun 23, 2018 8:43 AM CST
jerijen said:By ALL MEANS wait until after the first bloom to feed. You really can kill a young plant by over fertilizing. Poor baby needs to grow ROOTS -- needs to walk, before it runs.

I think you've been getting a lot of cool foggy weather, right? (I was just there!) So, let the soil dry to the touch before you water again.

Dunno what those white-ish spots are, but you know, I think I'd remove those leaves. The rest just looks like "mechanical" damage, to me.


Thanks for the suggestion! I think I'd rather wait until their first bloom. Yup, it's cool foggy weather until September, which is the warmest month in SF. Regarding soil dry, is there a difference between soil that is cool and dry, and soil that is cool and moist? I usually water them when the soil is cool and dry because the terracotta pots keep the soil cool all the time.

Regarding the white spot, yup, I removed the leaves. I believe it was the work of sawfly larvae because I spotted an adult sawfly (seen in the image) this morning. No wonder I also spotted a few holes in a handful of foliages. I posted a separate forum thread seeking a recommendation on what kind of insecticide to use to treat rose sawfly.
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Name: Shyam
San Francisco, CA (Zone 10b)
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Rose_Guy1127
Jun 23, 2018 8:44 AM CST
RosesnTx said:I concur with Jeri, I always wait to see new growth and and new blooms before I fertilize a new rose. By letting the roots grow strong your rose will be healthier and able to fight off disease easier, in my experience anyways.


Thanks, I decided to wait until their first bloom. The focus now, as Jeri suggested, is to let the plant establish a healthy root system.
:)
Coastal Southern California (Zone 13a)
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jerijen
Jun 24, 2018 12:15 PM CST
You know, Rose Guy -- I've been thinking about whether I should mention this . . . Other than micro-miniatures, pretty much all roses do better in the ground than they do in pots (which does not mean that I don't grow some in pots. I do).

But if you're going to have to use pots, terra cotta pots are the 100% worst choice for roses. (The BEST choice is a plastic pot, or one that is glazed inside, or a plastic pot inside a decorative pot.) So, if you're growing in a Terra Cotta pot, you're really going to have to be "on top of" watering needs. I would say, stick your finger into the soil, and if it's damp, wait another day.

The OTHER thing about pots is that --- most people start out by using a pot that is maybe 1/4 the size that the rose needs. We killed our first Miniatures that way. How were we to know that a 24-inch pot was minimal for a Mini? SHEESH!

For a rose the size of an Austin? You need some HUMONGOUS pot. Really.
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See this pot? I'm growing a rose in it that should get up to maybe 4-5 feet tall. In this pot, we have to root-prune every few years, and it only gets to about 3-ft. Max. I'm guilty of Cruelty to Roses ... but it does look good, doesn't it?

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