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Controlling black leg 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:
1.) Rovral Brand 4 Flowable, EPA Reg. No. 279-9564, EPA SLN No. OR-140013; and
2.) 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
Information about ODA's Black Leg temporary rule
Seed treatments that may control or suppress black leg
This document contains one table showing Oregon-registered products and another table showing registered special local need (SLN) products to control black leg. 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
Buffers Imposed by the U.S. District Court Order
Reinstated Streamside No-Spray Buffer Zones – New Information available from EPA as of 8/27/2014
“EPA reinstates no-spray buffer zones in California, Oregon and Washington to Protect salmon as a result of final settlement agreement for northwest center for alternatives to pesticides v. EPA”.
As of August 15, 2014, EPA reinstated streamside no-spray buffer zones to protect endangered or threatened Pacific salmon and steelhead in California, Oregon and Washington. This action is directed by a stipulated injunction (agreed to by the parties) that settles litigation brought against EPA by the Northwest Center for Alternatives to Pesticides and others in U.S. District Court in Washington State. On August 15, 2014, the U.S. District Court for the Western District of Washington entered the stipulated injunction, reinstating the streamside no-spray buffer zones that were originally established in prior litigation; Washington Toxics Coalition (WTC) v. EPA. The reinstated buffers are part of the final court order; however, they will not be included as labeling requirements under the Federal Insecticide, Fungicide, and Rodenticide Act (FIFRA).
No Spray buffer zones will be imposed for the following pesticides in waters that support salmon:
The no-spray buffer zones, 20 yards (60 feet) for ground pesticide applications and 100 yards (300 feet) for aerial pesticide applications, are effective from August 15, 2014. The no-spray buffer zone restrictions will remain in place until EPA implements any necessary protections for Pacific salmon and steelhead based on reinstated consultations with the National Marine Fisheries Services.
To view the no-spray buffer zones go to EPA’s Salmon Mapper. The interactive map will be updated no later than September 30, 2014, to include the current list of chemicals subject to the restrictions, enhanced spatial resolution, and the most recent geospatial data depicting stream reaches where the buffer zones apply.
Under the settlement agreement, there are three use exemptions carried over from the WTC case:
Public health vector control administered by public entities,
National Marine Fisheries Services authorized programs
Use of carbaryl under a Washington state-issued 24(c) registration for oyster beds in the estuarine mudflats of Willipa Bay and Grays Harbor.
In addition to the five pesticides being addressed by the stipulated injunction, buffers remain in effect for seven active ingredients that were included in the original WTC case, pending final biological opinions from the National Marine Fisheries Services. These active ingredients are:
- 1, 3-D
- Racemic metholachlor
For more information on specific buffer zones and background on the Northwest Center for Alternatives to Pesticides v. EPA visit
Complains, concerns or questions regarding the Court ordered buffers should be directed to firstname.lastname@example.org