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Farmington, Utah

I have this product that is a fungicide. I need to know if it is systemic? And at what rate should I mix it per gallon? It is water soluable.
Chlorothalonil(Tetrachloroisophthalonitrile) 90%,Inert 10% granular. Any help wpould be great steve. th

7/19/2004 9:18:16 PM

Ctpumpkin@optonline.net

Most commonly called Daconil. It is a contact fungicide. Very good when combined with a systemic.

7/19/2004 10:02:05 PM

Ctpumpkin@optonline.net

10% Granular???

Sorry. I hadn't noticed that part before. It has no use in the patch. Contact fungicides work by just that; contact. They are intended to make physical contact with foliage. There a protective layer is established that will remian toxic to the fungi causal pathogen. When the application is timed to coincide with the pathogen's awakening, it encounters the toxic layer & dies.

There are systemic granular fungicides that work on soil borne root diseases. These are Subdue & Cleary's 3336 Granular (Thiophanate-methyl). Theses still don't "move up" the plant to protect leaves though. They only work on soil pathogen induced root diseases like Fusarium, Pyhtophthora, & Rhizoctonia.

Daconil is not my favorite contact fungicide. But it does work. However it must be applied as a liquid spray where it will protect only those parts that are sprayed directly.

The granular forms are produced primarily for Turf applications where it is assumed it will adhere (somewhat) to wet grass. Irrigating prior to application or working in the morning dew is the supposed mode of activation. I don't find this to be an effective use either since many areas don't receive the full effect of the fungicide.

7/19/2004 10:59:19 PM