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EBDCs (General Information) Information Update for Growers 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 sued 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 lable statement is also intended to protect workers 
from being over exposed to EBDC.

     Source: Rohm & Haas