Bonsai Fungus

So does this maple look like it has a fungus or leaf scorch? The leaves are more curled up when not wet. It happened to be raining when I took the pictures. I've been thinking they just got scorched but after reading this thread I'm second guessing...

You have me wondering now smoke. This is a jabotacabba that I thought was sun burned...is it fungus?

Filed under fungus. Saw this in the forest. Black spot...turns leaves yellow...eventualy wipes out plant. Very interesting looking.

I've been using Bonide Infuse granular systemic (Thiophanate-Methyl) on my trident and Japanese maples. One trident and a kotohime have no signs, when this time of year every koto ive owned has had problems. Im not sure if its because of the Bonide or better practices.

Anyway, how can or should this be used in conjunction with Daconil or any other spray?

@Smoke Can you speak to, or have you ever experienced slowed vegetative growth from the use of fungicides? I've read several people on the forum say they have noticed it. A large trident of mine has stalled in growth while others haven't, and its been treated heavier. Hard to say, it could be the result of the infection or the fungicide.

I live in Fresno Cal. and you live in North Carolina, like a silly Ryan video, nothing I could say to you would be effective there and may kill a plant in better conditions than where I live. If you are having good luck then stay with it. If something changes, then start experimenting. That's what I do, I don't come here looking for answers that will not work for me. I don't mean this to sound condescending or shot from the hip. It's just the way I have always done it. I am working on trees all day every day, pruning, pinching, whatever. I am a doer, my own man....I can do it or figure it out. This is not hard stuff.

What are you paying for gas there...buck and a half? 3.50 a gallon here....nothing is the same here.....

JoeR said:

@Smoke Can you speak to, or have you ever experienced slowed vegetative growth from the use of fungicides? I've read several people on the forum say they have noticed it. A large trident of mine has stalled in growth while others haven't, and its been treated heavier. Hard to say, it could be the result of the infection or the fungicide.

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I have never noticed anything like that ever. I don't use systemics, so I spray religiously monthly, thats it.

AZbonsai said:

View attachment 163213


You have me wondering now smoke. This is a jabotacabba that I thought was sun burned...is it fungus?

View attachment 163214

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I'll answer with a question? Look back in your way back machine and tell me how many times in the last month you forgot to water. If the answer is none, then where is the plant located, in the direct sun all day, then move it. If none of things have happened to the tree, then obviously it is something else. So what I would do is take all the leaves off, spray it with Bayer 1,2,3 weekly till the leaves are starting to unfurl then once a month after that for the rest of the year. Come back here and tell me what you find.......After the first monthly spray switch to copper diluted properly or weaker and spray more. Then alternate.

EPM said:

View attachment 163068 View attachment 163069 So does this maple look like it has a fungus or leaf scorch? The leaves are more curled up when not wet. It happened to be raining when I took the pictures. I've been thinking they just got scorched but after reading this thread I'm second guessing...

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This is a very small picture. I have no idea how you got one so small?


Look at the color of the leaf on the tips. Maple leaves do not turn black in the sun and not on the tips. Look at the tip with a magnifying glass and tell us what you see in the veins? Pull a leaf off your plant and let it be in the sun for half a day, thats what they look like with sun scorch. On day one they will turn greyish green, and on day two the whole leaf will turn brown. Brown, not black. leaves turn black because they are rotting, like throwing a hand full under a rock on wet soil and coming back in ten days. BLACK!

Good healthy leaves do NOT turn brown on the edges. They turn colors on the edges because they are sick and it's 99% usually fungus or worse. Don't ever let someone tell you that your maples with dark brown edges or black edges are getting leaf burn, thats bull shit. Like I said I'm in 105 degrees today and 107 tomorrow and worse for the next several weeks. At least ten days thats all the forecast goes and it's only accurate for a week. Treat for fungus like I told the other guy and get those infected leaves off the tree and burn them, it does spread if you get the spores all over the place like V. wilt.

Thats. it, easy peasy....

Now before the next jackass come along to tell me he has seen sun scorched J maples before. Your right, so have I, in my own back yard. I have five of them that by the end of summer look like the top has been exposed to a blow torch. The entire canopy on them will turn BROWN and crispy. If you stand under the tree and look up, everything looks normal, all green and beautiful, but the top does get burnt. The leaves look different when ruined in this way. I wish I could show you some, but my trees still look OK right now. But they will turn to shit soon.

Why is this?

Well the maple trees in my yard are in direct sun, which is poor for an under story tree that grows in the shade of a taller forest.
Second, the maples are seven feet tall, rather tall for a maple growing in direct sun. The tree is too tall for the 105 heat of the day for the tree to push the water up that hill day after day all summer, by July 15 the tree will brown off on top. It just gets too little moisture up there to keep up with the sun.

Now if anyone wants to tell me they feel the same thing is happening with a bonsai under two feet tall in a pot watered everyday, I got some real estate for sale.

JoeR said:

I've been using Bonide Infuse granular systemic (Thiophanate-Methyl) on my trident and Japanese maples. One trident and a kotohime have no signs, when this time of year every koto ive owned has had problems. Im not sure if its because of the Bonide or better practices.

Anyway, how can or should this be used in conjunction with Daconil or any other spray?

@Smoke Can you speak to, or have you ever experienced slowed vegetative growth from the use of fungicides? I've read several people on the forum say they have noticed it. A large trident of mine has stalled in growth while others haven't, and its been treated heavier. Hard to say, it could be the result of the infection or the fungicide.

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I'm really glad the Bonide is working for you. I have tried monthly Clearys 3336 this year and am still getting some fungal infections on my trident maples. I might try switching over.

Lars Grimm said:

I'm really glad the Bonide is working for you. I have tried monthly Clearys 3336 this year and am still getting some fungal infections on my trident maples. I might try switching over.

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Well... I think its working a little anyway. Unfortunately my largest and best trident is still not growing happy, and I have posted it in another thread asking for help. I'm not sure why but growth has been stalled since the initial flush, and some leaves still show slight infection. No new growth really. I've used daconil and the systemic on it

JoeR said:

Well... I think its working a little anyway. Unfortunately my largest and best trident is still not growing happy, and I have posted it in another thread asking for help. I'm not sure why but growth has been stalled since the initial flush, and some leaves still show slight infection. No new growth really. I've used daconil and the systemic on it

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Can you share the other thread? I can't find it and I'd like to compare notes.

Lars Grimm said:

Can you share the other thread? I can't find it and I'd like to compare notes.

Click to expand...

JoeR said:

I've been using Bonide Infuse granular systemic (Thiophanate-Methyl) on my trident and Japanese maples. One trident and a kotohime have no signs, when this time of year every koto ive owned has had problems. Im not sure if its because of the Bonide or better practices.

Anyway, how can or should this be used in conjunction with Daconil or any other spray?

@Smoke Can you speak to, or have you ever experienced slowed vegetative growth from the use of fungicides? I've read several people on the forum say they have noticed it. A large trident of mine has stalled in growth while others haven't, and its been treated heavier. Hard to say, it could be the result of the infection or the fungicide.

Click to expand...

There are some fungicides that do have growth regulator properties intrinsic to the active ingredient. I see PGR effects from Propiconazole pretty regularly.

One of the breakdown products of Thiophanate-Methyl Is carbendazim. Which is actually used as a growth regulator.

Every active ingredient is different pyraclostrobin has very well documented growth enhancing properties, by suppressing ethylene production and reducing plant stress.

NOZZLE HEAD said:

There are some fungicides that do have growth regulator properties intrinsic to the active ingredient. I see PGR effects from Propiconazole pretty regularly.

One of the breakdown products of Thiophanate-Methyl Is carbendazim. Which is actually used as a growth regulator.

Every active ingredient is different pyraclostrobin has very well documented growth enhancing properties, by suppressing ethylene production and reducing plant stress.

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Fantastic, first legitimate support behind this claim and keywords to use for Google. Thanks.

On a similar note, I've read that Tomato growers will spray diluted aspirin on their tomatoes to boost immune response, as it's similar to a naturally produced metabolite. I've been thinking about trying this for myself

JoeR said:

Fantastic, first legitimate support behind this claim and keywords to use for Google. Thanks.

On a similar note, I've read that Tomato growers will spray diluted aspirin on their tomatoes to boost immune response, as it's similar to a naturally produced metabolite. I've been thinking about trying this for myself

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Salicylic acid is an SAR (systemic acquired resistance) elicitor, but I have never used it. It does have some auxin like activity so could cause some odd growth or stretching of internodes, but that is just a guess.

As an SAR elicitor in crop and on my trees I use Phosphites they are really benign, and inexpensive.

Thx. Really good thread. I do not systematically spray agains fungals, and was hoping to learn a bit more on the pros and cons. Did in this thread.

NOZZLE HEAD said:

There are some fungicides that do have growth regulator properties intrinsic to the active ingredient. I see PGR effects from Propiconazole pretty regularly.

One of the breakdown products of Thiophanate-Methyl Is carbendazim. Which is actually used as a growth regulator.

Every active ingredient is different pyraclostrobin has very well documented growth enhancing properties, by suppressing ethylene production and reducing plant stress.

Click to expand...

Thanks for this. I have used more systemic fungicides (Cleary’s 3336 and Daconil particularly) over the last few years, and am convinced they have had an impact on growth rates in my trees. I am not sure Mancozeb has as much of a stunting effect.

Brian Van Fleet said:

I have used more systemic fungicides (Cleary’s 3336 and Daconil particularly) over the last few years, and am convinced they have had an impact on growth rates in my trees.

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enhancing growth?

leatherback said:

enhancing growth?

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Stunting growth.

Brian Van Fleet said:

Stunting growth.

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I started using Systemic fungicides routinely in 2018. Here is a comparison of growth on my hawthorn over the last few years, before the spring haircut. Not sure what else to attribute it to. Next year, I’m going to withhold any fungicides and see if there’s an improvement.

4/2013:


4/2015


4/2017:


6/2019:


6/2020: