By Jill MacDonald, Perennia Research Associate
Chlorothalonil
is a contact and protectant fungicide that controls a broad range of fungal
diseases. It is used on a number of crops. Due to the recent re-evaluation of
chlorothalonil by the Pest Management Regulatory Agency (PMRA) there are
changes that will affect how growers use the product, in relation to how it is
mixed, loaded and applied. The re-evaluation has caused a discontinuation of
Bravo 500 and Ridomil Gold SL/Bravo Twin-Pak formulations. The final day that
these products will be available for purchase is May 10th, 2020, and the final
day that growers will be able to make applications of these products is May 10,
2021. After this time, it will be the
responsibility of the grower to properly dispose of any leftover product.
How will
these changes affect how I use chlorothalonil products?
Changes to Number of Applications Permitted
There have
been several changes made to the number of applications that are permitted on
fruit and vegetable crops, it is important to check how your crop is affected.
The full list of changes, including application rates and REIs can be found here.
A few of
the crops that are undergoing changes to the number of applications permitted
per season:
Crop
|
2019
|
2020
|
Blueberry (HB)
|
3
|
2
|
Cabbage
|
5
|
2
|
Celery, field
|
9
|
2
|
Cherries (sweet and sour)
|
4
|
3
(2 spring + 1 post-harvest) |
Cole Crops
|
5
|
1
|
Cranberries
|
3
|
1
|
Cucurbit Vegetables
|
7
|
2
|
Onion, dry bulb
|
3
|
2
|
Onion, green bunching
|
5
|
2
|
Peach, nectarine
|
4
|
3
(2 spring + 1 dormant) |
Potato, table
|
12
|
3
|
Tomato (not for processing)
|
9
|
2
|
Wheat
|
3
|
2
|
Additional PPE, Buffer Zone Changes and REI
New
requirements have been put in place to protect the applicator and persons who
are handling the product, by increasing the amount of personal protective
equipment (PPE) required. It is recommended to read the revised product label
to obtain information on PPE and changes to the buffer zone requirements and
restricted entry intervals (REI) for certain activities. Growers are reminded
to have the updated label available to staff members who may come in contact
with the product, as well as making them aware of the changes.
Implementation of Vegetative Filter Strips
 |
Introduction of Closed-system Transfer
The PMRA
will now require growers, under certain circumstances, to use a closed-transfer
and application system. The closed-system transfer specifically focuses on
mixing and loading of the product. All
potato applications, or any applications when more than 340 kg a.i. are handled
in one day will be subject to these requirements. When product is directly transferred from the
tote to the sprayer tank, this will now require dry poppet connections which
comply with closed-transfer. Dry poppets are available from several
manufactures and are also known by several names, such as dry poppet couplings
or valves. Syngenta currently supplies a female dry poppet to male cam lever
adapter with each tote of Bravo Zn. Many chemical handling systems and sprayers
are fitted with cam lever connections from the factory, in this case you can
purchase a dry poppet to cam lever adapter. The existing dry poppet valves on
the 450L totes of Bravo®ZN are already compliant with the closed-system
transfer requirement and will not need to be altered.
 |
Figures were obtained from: https://www.syngentaebiz.com/Media_Upload/Pdfs/SY_19_WhitePaper_BravoZNClosedSystem_R3.pdf?utm_source=pardot&utm_medium=lp&utm_campaign=895&utm_content=en
Additional Important Changes
Hand
harvesting of processing tomatoes and application through irrigation systems on
strawberries and cucurbits (cantaloupe, muskmelon, honeydew, squash, pumpkin,
watermelon and cucumber) is now prohibited.
For further details, please visit Syngenta.ca.
For further details, please visit Syngenta.ca.
