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New rule prohibits neonicotinoid applications to linden trees
The Oregon Department of Agriculture (ODA) held a public hearing on January 21, 2015, regarding a proposed new rule. The rule, as proposed, would prohibit the application of any product containing dinotefuran, imidacloprid, thiamethoxam, or clothianidin, regardless of application method, to linden trees, basswood trees or other Tilia species.
Comments were accepted on the proposed new rule from December 12, 2014, until
5 p.m. January 21, 2015. These comments were carefully reviewed and considered by ODA. Some of the commenters suggested that ODA should only prohibit the use of dinotefuran and imidacloprid, and not also prohibit the use thiamethoxam and clothianidin on linden trees.
After much deliberation, the department decided to prohibit the application of any product containing dinotefuran, imidacloprid, thiamethoxam, or clothianidin, regardless of application method, to linden trees, basswood trees or other Tilia species.
The permanent rule (OAR 603-057-0388) went into effect on February 27, 2015. The rule supersedes label language. This means that even if a pesticide user has a pesticide label which provides directions for use on linden trees, ornamental trees (or a similar site), the product can not be used on linden trees, basswood trees or other Tilia species in the State of Oregon.
Certificate and Order for Filing on Prohibiting Neonicotinoid Applications to Linden Trees
Pesticide Advisory: Permanent Rule Prohibiting the Use of Dinotefuran, Imidacloprid, Thiamethoxam, and Clothianidin on Linden Trees
Rule Prohibiting Neonicotinoid Applications to Linden Trees
Reminder about preventing herbicide drift
Text of ODA Director Katy Coba's message about preventing herbicide drift
Phone message recorded Feb. 24, 2015. In English
Details about permanent blackleg rule in Oregon
2014, Oregon State University Extension personnel detected an outbreak of
blackleg disease in Brassica (broccoli, Brussels sprouts,
cabbage, canola, cauliflower, Chinese Brassica
vegetables, collards, kales, mizuna, mustards, oilseed rape, oilseed turnip
rape, rutabaga, turnip, etc.) and Raphanus (daikon or radish) seed and
vegetable fields in the Willamette Valley. Following several meetings with an advisory committee, ODA has adopted amendments to OAR 603-052-0870 to
protect crucifer crops grown throughout Oregon from
this disease. The following is a list of frequently asked questions about the
FAQ: Permanent Rule for Blackleg Disease Prevention in the Willamette Valley
Controlling blackleg and two other diseases in crucifer crops
Three fungal diseases have caused epidemics in the Willamette Valley on crops of the Brassicaceae family’s cruciferous vegetables, as well as on related plants and weeds in 2014.
In surveys conducted by Oregon State University (OSU) scientists beginning in March, the diseases—black leg, light leaf spot, and white leaf spot—have been observed in fields of Brassica species vegetable crops (e.g. broccoli, cabbage, Chinese cabbage, collards, kale, mizuna, turnip) throughout the Willamette Valley.
The diseases also have been detected in fields of genetically related crops such as Raphanus species (radish and daikon), canola, forage brassicas, and in volunteers of these species found as weeds in other fields. All these crops are thought to be potentially susceptible to the pathogens, whether being grown for seed, for fresh market or processing vegetables, or as forage or cover crops.
In response to these disease detections, the ODA Plant Health Program adopted a temporary rule in July 2014 requiring that, before planting, seed stocks of susceptible crops either be tested and certified as free from black leg, or be treated with a fungicide or suitable alternative treatment. ODA’s pesticide registrations team is working closely with OSU and ODA Plant Health pathologists, growers, and pesticide registrants to identify and obtain FIFRA Section 24(c) Special Local Need (SLN) registrations for effective products that growers can use to manage or prevent future disease outbreaks.
ODA has granted two SLN registrations for seed treatment fungicides and is working with a third company for an additional seed treatment SLN. In the upcoming months, ODA likely will grant one or more SLNs for fungicides that can be used as foliar applications to the growing crops to protect against wind-blown spores.
These SLNs will be for products that have several modes of action, to provide options for disease resistance management.
The two recently registered seed treatment SLNs are for:
- Rovral Brand 4 Flowable, EPA Reg. No. 279-9564, EPA SLN No. OR-140013
- Mertect 340-F, EPA Reg. No. 100-889, EPA SLN No. OR-100014
Note that this Mertect SLN is a new revision to an existing SLN that had been granted in 2010 for use on crimson clover seed. Also, these two SLNs are limited to treating seeds that will be planted to grow crops for seed only.
The seeds harvested from crops grown from these treated seeds must be planted, and cannot be used for oil, sprouts, or other food or feed purposes. Residue tolerances have not been established for these chemicals to support use on seed/crops being grown for food, animal feed, or oils.
To further assist growers, the registrations team is developing outreach materials that identify the fungicides available to help control these diseases and the specific crops to which each product can be applied.
Find out more
Seed treatments that may control or suppress blackleg
This document contains one table showing Oregon-registered products and another table showing registered special local need (SLN) products to control blackleg. Document
Fall 2014 issue of ODA Pesticide Bulletin now available
ODA Pesticide Bulletin
Fall 2014 edition of bi-annual newsletter. Information includes: EPA reinstates no-spray buffer zones; time to check your pesticide credit history; pesticide collection events; ODA issues temporary rule on dinotefuran and imidacloprid use; EPA proposes changes to Worker Protection Standard; fungal diseases have caused epidemics in crucifer crops; agencies expand efforts in pollinator health. Document