Cedar Rust Apples

[Shogun610]

Considering all of my posts get ignored , the only way anyone answers is on here. Can you treat apple rust once they leaf out, will it worsen? And if I can’t treat then will need oil work, or just wait till dormancy.

 

[badatusernames]

If it's similar to quince rust you can find some detailed posts here. I'm talking about quince, so may want to double check that it's a similar treatment.

Long story short, for quince, if it were my tree I would cut off the impacted leaves. I would then likely either spray it with Cleary's or do a Daconil root drench. Someone in this thread said it took about three weeks to treat.

quince rust

before i take action - this is rust and must be removed and burned correct? this is a japanese quince which i know are prone to fungal issues. i was late in putting infuse on it, but it recently got that systemic on it as well as clearys on it a bit ago

www.bonsainut.com

 

[Shogun610]

If it's similar to quince rust you can find some detailed posts here. I'm talking about quince, so may want to double check that it's a similar treatment.

Long story short, for quince, if it were my tree I would cut off the impacted leaves. I would then likely either spray it with Cleary's or do a Daconil root drench. Someone in this thread said it took about three weeks to treat.

quince rust

before i take action - this is rust and must be removed and burned correct? this is a japanese quince which i know are prone to fungal issues. i was late in putting infuse on it, but it recently got that systemic on it as well as clearys on it a bit ago

www.bonsainut.com

Thanks, so Daconil, is that similar to Neem oil and can it be sprayed after it is leafed out? I Did cut off affected leaves

 

[badatusernames]

Thanks, so Daconil, is that similar to Neem oil and can it be sprayed after it is leafed out? I Did cut off affected leaves

No, it's this stuff. Someone mentions ratios in the thread I posted. You mix the water and then soak the pot (not putting the leaves in it) for a bit.

Amazon.com

Neem is more used for pests like bugs, this would be more of a fungal problem. Cleary's is another concentrate you would mix with water and then use a mister to spray the plant with, it's also a fungicide. Based on everything I've read, I wouldn't do both at the same time and give a plant at least a week to catch up. Probably more than that. The Daconil will take a bit to work because it's absorbed by the roots into the plant.

 

[WNC Bonsai]

Bonide Infuse is a systemic fungicide which the plant absorbs when sprayed on. Daconil is a contact fungicide which kills the fungi that land on the leaves and prevents an infection. Some use lime sulfur in winter to kill spores on the plant bark. If you read the labels most tell you that they prevent new infections but really do little once an infection occurs. So you need to be proactive and treat well before an infection. That means using lime sulfur in winter then Infuse or Cleary’s (another systemic) to prevent infections. You can then use Daconil or Mancozeb as alternatives afterwards to prevent the fungi from building up a resistance to the others.

 

[badatusernames]

Bonide Infuse is a systemic fungicide which the plant absorbs when sprayed on. Daconil is a contact fungicide which kills the fungi that land on the leaves and prevents an infection. Some use lime sulfur in winter to kill spores on the plant bark. If you read the labels most tell you that they prevent new infections but really do little once an infection occurs. So you need to be proactive and treat well before an infection. That means using lime sulfur in winter then Infuse or Cleary’s (another systemic) to prevent infections. You can then use Daconil or Mancozeb as alternatives afterwards to prevent the fungi from building up a resistance to the others.

That's helpful to understand it a bit more, thank you! I'm playing a bit of catch-up because this is my first year really diving into this facet of it. I know the place I got my particular tree treats their plants with fungicides as they overwinter customer trees as well, so I suspect that there's an element of... well, life does find a way sometimes, I guess.

 

[Shogun610]

Bonide Infuse is a systemic fungicide which the plant absorbs when sprayed on. Daconil is a contact fungicide which kills the fungi that land on the leaves and prevents an infection. Some use lime sulfur in winter to kill spores on the plant bark. If you read the labels most tell you that they prevent new infections but really do little once an infection occurs. So you need to be proactive and treat well before an infection. That means using lime sulfur in winter then Infuse or Cleary’s (another systemic) to prevent infections. You can then use Daconil or Mancozeb as alternatives afterwards to prevent the fungi from building up a resistance to the others.

Thanks both, so for now using the daconile during leaf will atleast control further spread? Is rust ever fatal to the tree? I cut off the couple affected leaves. It was raining for 3 days straight, perfect weather for fungal issues. Besides this it has been doing well. I’ll hit it with like sulfur in winter.

 

[dacoontz]

My understanding is cedar apple rust is not curable just controlled. Kind of like being a carrier of a virus of sorts. I believe I recently found it in a crab apple and cut off all the leaves and fruit. Then sprayed it with copper fungicide which I believe is not as good as daconil. It’s starting to leaf back out already and so far they look healthy. Will likely treat with infuse once it’s recovered a little more.

 

[Shogun610]

My understanding is cedar apple rust is not curable just controlled. Kind of like being a carrier of a virus of sorts. I believe I recently found it in a crab apple and cut off all the leaves and fruit. Then sprayed it with copper fungicide which I believe is not as good as daconil. It’s starting to leaf back out already and so far they look healthy. Will likely treat with infuse once it’s recovered a little more.

From my understanding, cutting off all leaves on crab apples isn’t the same as say tridents or other deciduous when you defoliate. But that’s good it’s leaving out healthily.

 

[dacoontz]

From my understanding, cutting off all leaves on crab apples isn’t the same as say tridents or other deciduous when you defoliate. But that’s good it’s leaving out healthily.

Yes, I’m not sure it was the right thing to do but I think it was early enough in the growing season that I’ve gotten away with it so far. I think I panicked a little. Have had so many different pests and diseases this year it’s been annoying. I think I just lost it and started cutting. Sucked losing all the apples though, there were many.