Information Requests Monitoring System

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Request ID: 130
Request From: Steve Toth
Date Requested: Jun 29, 2005
Request: Note the following request for information on applicator/handler activities involving mancozeb. Please circulate this request to experts in your respective states/territories and submit any responses to the Southern Region IPM Center Information Requests Monitoring System by Tuesday, July 12, 2005. Thanks. Steve Toth ---------------------------------------- EPA is looking at considering mitigation measures for mancozeb. For workers (applicators/handlers), they are considering the use of PPE (single layer and PF 5 respirator) for most crops. This is an improvement to the current double layer required on the label. For turf, they may require the use of water soluble packs and for seed treatments a closed capture system for dust formulations. The current Re-Entry Interval (REI) is 24 hours for all crops. For most crops, they are proposing a change, for others they need your feedback to understand the cultural practices relative to mancozeb application. Listed below are the suggested REIs, and questions, for each crop. If a crop is not listed, the REI will not be changed. Please let me know if there are activities growers need to do that this REI would inhibit. Proposed REIs: Greenhouse cut flowers: 3 or 4 days (when do workers perform high contact activities?) Cranberry: 2 days Banana: 2 days Tobacco (field): 2 days Apples: What is the maximum feasible REI? What activities follow an application? Christmas Trees: What is the maximum feasible REI? How soon after application do growers shear trees? Turf: When do workers need to enter? What activities? Potatoes, Sugar Beets: Is there any hand harvesting? What is the maximum feasible REI? What activities need to be done following an application? Asparagus: 1 day Cucurbits: What is the maximum feasible REI? What activites need to be conducted following an application of mancozeb? Tomato: 1 - 2 days Grapes: What is the maximum fesible REI? How soon after application do workers need to enter? What activities? Let me know if you have any questions. Dhol Herzi Office of Pest Management Policy, USDA (202) 720-2664 dherzi@usda.gov

Responses
Responder: John Hartman
State: KY
Date Requested: Jul 01, 2005
Response: These comments relate to Kentucky ornamentals and fruit crops: Greenhouse cut flowers - I don't know if mancozeb is used much in the greenhouse, but a 3-4 day restriction would likely end its use there. Greenhouse plants need daily attention to activities such as watering, transplanting, pruning, cutting, and harvesting - if not on the treated crop, then on other crops growing nearby in the same greenhouse structure. Apples - The re-entry interval is already 1 day. Adding a day to that would not be a hardship. Perhaps even more days could be added, since the typical re-entry is done with the next spray application. With the 77 day PHI already in place, mancozeb applications are not made near the time of harvest when workers would likely be in the orchard. Christmas trees - Shearing is done near the end of June and beginning of July here. Most fungicide applications are done earlier in spring or later in the summer or fall. A 2-day REI or more will not likely be a problem. Grapes - A one-day REI already exists along with a 66-day PHI. Some cluster-thinning and vine training might occur after these early-season applications. Perhaps the REI could be extended by a day or two.

Responder: Darrell Hensley
State: TN
Date Requested: Jul 11, 2005
Response: Apples: What is the maximum feasible REI? What activities follow an application? 2 days would be the maximum, but I would rather see 24 hours. The primary practices would be thinning. There could be some limited summer pruning, but thinning would be the most important. Christmas Trees: What is the maximum feasible REI? How soon after application do growers shear trees? Turf: When do workers need to enter? What activities? Potatoes, Sugar Beets: Is there any hand harvesting? What is the maximum feasible REI? What activities need to be done following an application? 24 to 48 hours would be acceptable. The primary practice would be cultivation or hand weeding. Asparagus: 1 day Cucurbits: What is the maximum feasible REI? What activities need to be conducted following an application of mancozeb? 24 to 48 hours would be acceptable. The primary practice would be cultivation or hand weeding. Tomato: 1 - 2 days This needs to be 24 hours if at all possible. Tying, pruning, and weeding are the primary practices. Grapes: What is the maximum feasible REI? How soon after application do workers need to enter? What activities? Again, 24 to 48 hours would be appropriate. Practices would be pruning, training, tying, weeding, etc.

Responder: Mark Mossler
State: PR
Date Requested: Jul 12, 2005
Not Important/Relevant to my state(s)
Response:

Responder: Mark Mossler
State: VI
Date Requested: Jul 12, 2005
Not Important/Relevant to my state(s)
Response:

Responder: Mark Mossler
State: FL
Date Requested: Jul 12, 2005
Response: I have received responses from pathologists who interact with cut flower growers, banana growers, and turf growers. The faculty member that works with cucurbit/ tomato growers recently retired, but I believe I can answer for him. In cut flowers, the pathologist says that a change in REI from one day to 3 or 4 would represent a "very significant" obstacle for its use in cut flower production, where it is used to manage downy mildew and bacterial diseases, as copper alone will not control the bacteria. The highest contact is at harvest for cut flowers workers, but many (>90 percent) use protective equipment on their hands. A 2 day banana REI would probably be OK. Turf growers want to basically spray this material right before harvest as the turf gets it's highest fungal "loads" during transport and laying. The only worker activity is movement of the sod from the field to the pallets on harvest days. Over 90 percent of these workers tape their fingers. For cucurbits and tomato, a one day REI is ideally the most flexible. The curcurbit activities are very similar to tomato activities, for which a timeline has been produced (please see IPM Center website). Some feel that one day REI is the maximum feasible, others feel they could tolerate two, but definately not more than two.

Responder: Gerald Holmes
State: NC
Date Requested: Jul 12, 2005
Response: The main problem with REIs and PHIs for cucurbits is the frequency of harvest. Cucumbers and summer squash are harvested daily during peak production. Cantaloupe, watermelon and pumpkin are harvested less frequently, but they are harvested multiple times and disease control is still important up until about a week before the last harvest. I've copied some colleagues in horticulture as they may have other comments. Gerald J. Holmes Associate Professor & Extension Vegetable Pathologist Department of Plant Pathology North Carolina State University Campus Box 7616; 1300 Gardner Hall Raleigh, NC 27695-7616 Voice: 919-515-9779 Fax: 919-515-7716 gerald_holmes@ncsu.edu

Responder: Turner Sutton
State: NC
Date Requested: Jul 12, 2005
Response: Apples: What is the maximum feasible REI? What activities follow an application? There usually isn't a lot of hand work early in the season when most applications are made. But it could impact hand thinning, though there usually isn't much done through 2nd cover, which I think is what the label permits, though it used to be 77 days. Growers have worked around the 4-day REI for captan, so I suppose it would be acceptable for apples as well. Grapes: What is the maximum fesible REI? How soon after application do workers need to enter? What activities? There is more hand work that goes on with grapes than apples, ie shoot thinning, shoot positioining, pruning, leaf pulling etc. For large growers 4 days wouldn't be too much of a problem becasue they would always be blocks that had not been sprayed recently, but it would keep most small growers out of the entire vineyard for the 4-day period. If the REI needs to be extended then 48 hours would fit much better. Turner B. Sutton Department of Plant Pathology North Carolina State Universityu

Responder: Bill Jester
State: NC
Date Requested: Jul 12, 2005
Response: Eastern cantaloupes are harvested every day once harvest has begun. Bill Jester Department of Horticultral Science North Carolina State University

Responder: Darrell Hensley
State: TN
Date Requested: Jul 12, 2005
Response: Tobacco (field): 2 days What is the maximum feasible REI? For tobacco one day would be better, since sucker control materials may need to be applied ... for Tennessee only. What activities follow an application? For tobacco, the addition of sucker control materials for Tennessee. Darrell Hensley University of Tennessee

Responder: Charles Luper
State: OK
Date Requested: Jul 12, 2005
Response: For Oklahoma turf and cucurbits are the main crops on mancozeb that are of interest. For turf our sod production does not use fungicides very often so this is not of big importance for this crop. For cucurbits in Oklahoma a 24 hour REI is best for late season control plus there are multiple harvest of these crops. Our growers may be able to tolerate a 48 hour REI at maximum but a 24 hour REI is stil the best.

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