A pre-harvest interval is the amount of time that’s required between a product application and cutting the crop in anyway — not just harvest. A PHI can always be found on a product label, and following the recommendation can help the crop dry down faster and keep product residues within maximum residue limits.

“When it comes to harvest, we’re not just talking about combining, we’re actually talking about cutting the crop,” says Andrew Reid, technical marketing specialist of herbicides with BASF. There is sometimes a misconception that after spraying a pre-harvest aid, you can go out the next day or so and start swathing, which Reid is here to clear up in this episode of Canola School.

“If you spray a pre-harvest aid on a standing crop of canola, and then there’s a hail storm or frost and the crop needs to be knocked down, if the PHI is three days, you still have to wait those three days,” says Reid. (Story continues below video)

“The most important thing to remember with a PHI is if you’re using more than one product in a tank mix combination, you have to go with the most restrictive PHI, which means the longest PHI,” says Reid. For example, if one tank mix partner has a PHI of three days but the other has a PHI of seven days, you have to wait the seven days.

Market access and product residue issues have been the focus of discussion lately. A PHI is in place to minimize a product residue as much as possible, and by following it, growers are better equipped to comply with maximum residue limits.

Remember that spraying earlier because there’s more time between application and harvest, does not actually minimize residues, in fact you can end up with more product residue in the grain if you spray too early. Double check your crop’s staging and application timing according to the label and be sure to follow those PHIs.

Related: Pre-harvest cautions and no glyphosate in Mexico

Leave a Reply

 

This site uses Akismet to reduce spam. Learn how your comment data is processed.

Privacy Preference Center

Necessary

Necessary cookies help make a website usable by enabling basic functions like page navigation and access to secure areas of the website. The website cannot function properly without these cookies.

gdpr, __cfduid, PHPSESSID, wordpress_test_cookie, woocommerce_items_in_cart, woocommerce_cart_hash, wp_woocommerce_session, wordpress_logged_in, wordpress_sec, wp-settings, wp-settings-time, __cf_mob_redir, wordpress_cache, realag
__cfduid

Marketing

Measuring interactions with the ads on the domain.

__gads,fsk_ut_2317
IDE

Statistics

These are used to track user interaction and detect potential problems. These help us improve our services by providing analytical data on how users use this site.

_ga,_gid,_gat,_cb,_chartbeat2,_chartbeat4
_ga,_gid
metrics_token

Preferences

Preference cookies enable the website to remember information that changes the way the website behaves or looks, like your preferred language or the region that you are in.

chartdefaults, comment_author, comment_author_email, comment_author_url
JSESSIONID, _os_session,anonymous_votes,csrf-param,csrf-token,user,user-id,user-platform,intercom-session,intercom-lou,intercom-session
personalization_id, tfw_exp