Is this brown spot on my maple leaves?

[Eckhoffw]

I want to be sure this is indeed brown spot before I spray and partially defoliate this plant.
Some leaves on the plant are only showing some yellow at the tips.

—-Also, would a citrus base fungicide do anything for it? Only ask because I have some on hand. Otherwise I’ll get the copper fungacide.
Thank you!!!

 

[nuttiest]

I think it looks fungal. You can spray with a systemic but that will only help the leaves locally, make sure nothing going on with roots or stems.
Looks like you are getting a lot of material and it gets out of control very fast if you don't use some of the different products. What citrus fungicide do you have?

 

[Eckhoffw]

I think it looks fungal. You can spray with a systemic but that will only help the leaves locally, make sure nothing going on with roots or stems.
Looks like you are getting a lot of material and it gets out of control very fast if you don't use some of the different products. What citrus fungicide do you have?

Thanks for the reply. I have this:I’ve read that sulfer and copper based fungicide is what is recommended for brown spot. I think I’ll pick some up.

 

[nuttiest]

ok, but the good stuff you can't just 'pick up' at the store.

 

[Eckhoffw]

Is this stuff bad? It’s available at most any hardware store.

 

[nuttiest]

Sorry Eckhoff, I think I turned my notifications for email off but don't see when threads are updated now -
No it's not 'bad' I shouldn't have implied that, I just meant if you are getting the serious systemics, do shop online. They sell propiconazole at hardware stores which is great, but it is so diluted it gets used up fast.
this copper is one of the most useful contact fungicides. What product(s) you use all depends on how agressively you want to treat things. I will have six different products I am putting on rotation to combat some serious problems this year that I feel are a result of not doing it in the spring.
Some can seem extremely expensive, but when you go to mix one tablespoon of powder to 2 gallons you realize you will not run out for a few years.

 

[Eckhoffw]

Sorry Eckhoff, I think I turned my notifications for email off but don't see when threads are updated now -
No it's not 'bad' I shouldn't have implied that, I just meant if you are getting the serious systemics, do shop online. They sell propiconazole at hardware stores which is great, but it is so diluted it gets used up fast.
this copper is one of the most useful contact fungicides. What product(s) you use all depends on how agressively you want to treat things. I will have six different products I am putting on rotation to combat some serious problems this year that I feel are a result of not doing it in the spring.
Some can seem extremely expensive, but when you go to mix one tablespoon of powder to 2 gallons you realize you will not run out for a few years.

No worries. Thanks for the info!

 

[nuttiest]

but about your leaves here - I have seen this in my yard, the yellow small specks and the few brown spots, and there was whitefly larvae on the underside of the leaves.
Does that mean you are safe, just little insects? No - some of the worst diseases are vector borne. It's why I kind of want to switch to reemptive measures on both, but it just seemed too much hassle. I think my problem spraying thins in the past is clogged sprayers, so I just don't anymore... I mix a dilute solution and use watering can.
Lastly, there are a few tree diseases that have no cure so get good at abiotic measures for those in case you are the type to keep trees around no matter what.