Caryx® – After the beast
25 Mar 2018
Given the recent unfriendly weather, the temperatures are back to normal but here’s some quick guidance if you’re wondering about Caryx and application timings.
Weather-bashed crops will start putting on fresh leaf growth quickly over the next 5-10 days. Snow cover can actually provide frost protection, and as long as stem extension wasn’t underway, most crops should have escaped unscathed.
Remember to wait for stem extension (crop at 30-40cm) and 7-10 days of good growing conditions prior to application. Although Caryx copes well with typical spring weather, it’s still important that the crop is in its phase of active growth before Caryx is applied.
So looking at the temperatures this is likely to be towards the end of March into early April. Caryx can be used right through to yellow bud which could be a good option this year. The cold start will have helped slow early spring growth and applying Caryx at yellow bud provides good canopy manipulation, secondary branching, more seeds/sqm and consequent yield increase.
The flexibility to use through to yellow bud also provides flexibility to fit in with other farm work.
Badly defoliated crops?
On any badly defoliated crops, where you are now questioning the use of Caryx, you can allow for leaf regrowth, then check the GAI again at the end of March. Then a GAI threshold of 2 (approx. 75% ground cover) is the threshold to decide if Caryx is required.
The BASF GAI App or website tool needs to be used before stem extension gets going strongly. If it already has, then you can weigh a representative square metre of above ground growth in kg and multiply by 0.8 to get the GAI (or 0.25sqm and multiply by 3.2)
The right sized canopy has a lot of green leaf at seed-fill due to good light penetration. A good check to see if your decisions work out!
Use plant protection products safely. Always read the label and product information before use. For further product information including warning phrases and symbols refer to https://www.agricentre.basf.co.uk
For further information, please do not hesitate to contact your local BASF Agronomy Manager or the BASF Technical Services Hotline: 0845 602 2553