Systemic granular fungicide.

[INDIGO-STEVE]

How long should I wait after repotting before applying a systemic granular fungicide?

 

[caffeinated]

I don't think there's a hard and fast rule. Some professionals I've heard say that you can play it safe and wait a couple weeks, but that it might not even be necessary. The fungicide just won't really do much of anything if the roots were worked super vigorously and need some time to respond. It's not like adding salts (chemical fertilizers) to freshly damaged roots, which might pose a little more of an issue, though that's also up in the air. There's also the consideration of the the pot microbiome, but that's a whole other argument.

 

[WNC Bonsai]

I would wait until I see active signs of foliar growth. That would indicate the tree is likely moving new roots and will take up the systemic.

 

[August44]

What are you using if I can ask?

 

[INDIGO-STEVE]

What are you using if I can ask?

Infuse

 

[INDIGO-STEVE]

I would wait until I see active signs of foliar growth. That would indicate the tree is likely moving new roots and will take up the systemic.

Thank you

 

[Wires_Guy_wires]

the roots were worked super vigorously and need some time to respond. It's not like adding salts (chemical fertilizers) to freshly damaged roots, which might pose a little more of an issue, though that's also up in the air.

It really depends on the type of fungicide and the plant. If it affects a biological process inside the plant as well, which some antibiotics sure do, then it can really hurt a plant on its way to recovery. And because it's systemic, there's no flushing it out.
But we only find these things out by trying. 80% of the recommended dose should be safe and still effective.

If anything, it makes sense to treat plants before repotting because it would help the wounds stay clear of infections.