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Mancozeb (Dithane M-45, Manzate 200) - Information Update Dithane 11/92

November 1992

Information Update for Growers on DITHANE mancozeb

All EBDC labels (DITHANE, Penncozeb, Manzate, Manex and Polyram etc.) now have
a statement on the label that reads as follows:
"If this product is used on a crop, no other product containing a different
EBDC active ingredient may be used on the same crop during the same growing
season."
This statement means that if you start the growing season with mancozeb
(DITHANE, Penncozeb, Manzate 200, or Manex II, you must not switch to another
type of EBDC (maneb or Polyram) on that crop during that growing season.  The
reverse is also true: if you start the season with maneb or Polyram, you
cannot switch to mancozeb later.
This statement has caused considerable discussion, and the EBDC/ETU Task Force
chairperson Dr. Janet Ollinger wrote EPA earlier this year seeking a
clarification and a change in this statement.  EPA responded that since this
exact language was in PD4, the document concluding the EBDC Special Review ,
no change could be made.
EPA did send a short Question and Answer document that explains the options
the grower has.  We have attached a copy of this for your reference.
EPA'S RESPONSES TO THE TASK FORCE'S QUESTIONS ON THE RESTRICTION STATEMENT
REQUIRED IN THE PD 4

Q.  Can a grower rotate applications of mancozeb, maneb, and metiram as long
as the total amount of EBDC applied does not exceed the amount listed on one
of the labels?
A.  No.  If a given EBDC product is used on a crop, no other product
containing a different EBDC active ingredient may be used on the same crop
during the same growing season.  Growers cannot rotate among mancozeb, maneb,
and metiram because each of these three fungicides contain a different active
ingredient.

Q.  Can a grower use one brand name of mancozeb initially, then switch to an
alternate brand name of mancozeb?
A.  Yes, so long as both brands are registered for the particular use and the
use pattern on the two labels is exactly the same for the crop or use in
question.

Q.  Can a grower use one type of formulation, then switch to an alternate type
of formulation using the same brand name?
A.  Yes, assuming that the two formulation s are of the same active ingredient
and both products in question are registered for the particular site.  Also,
for the particular site in question, the application rate between the two
formulation sin terms of active ingredient applied per acre must be exactly
the same.

Q.  Is this statement required on the labels for products that do not have
food uses, but only turf and ornamental uses?
A.  Yes.  In addition to preventing the production of crops with over
tolerance residues, the label statement is also intended to protect workers
from being over exposed to EBDC.
     Source: Rohm & Haas