I have in the past day or maybe two had some of my light green varieties suddenly showing some very pale new leaves and some of my Early Reds are showing red with the very newest and smallest leaves very pale.
I sprayed with Judo 5 days ago.

My question is how does phtotoxicty display itself in poinsettias?
And how far does it affect poinsettias?
The leaves that were sprayed, or the entire plant?

Hi tnt -

The way phytotoxicities are expressed will vary greatly depending the which chemical was used and the method of application. Some things that can show up after an application include:

Marginal burn
Leaf yellowing and chlorosis
Leaf Rolling
Leaf distortion, cupping, and crippling

Typically if damage from a chemical is a problem we expect to see it within a day or two of the application but there are exceptions to this, especially with drench applications.

Where the damage occurs on the plant depends on how the chemical works in the plant. If it's not systemic the damage usually only occurs on the leaves that were sprayed. If the chemical translocates it can affect the entire plant.

Whether or not the damage is permanent also depends on the chemical. Obviously burn cannot be corrected but hopefully new healthy foliage will cover the damaged leaves. Sometimes with distortion and cupping it can take a considerable amount of time for the plant to grow out of the damage. Here again, the damaged leaves won't recover but hopefully new growth comes out clean.

Judo is not systemic so damage would more than likely only affect the foliage sprayed. If the damage is from the Judo you would probably also see damage on the older foliage, not just the new growth.

Do you have a picture you can post? This would help give us a better idea of your situation.