In a ripening crop, the power of the sap flow in the neck of the onion becomes too weak at a certain point to support the foliage. The result is that the foliage starts to iron and the neck of the onion is pinched shut, as it were.
The rate at which the foliage subsequently dies depends, among other things, on the disease pressure in the crop and the availability of moisture. If you want to extend the shelf life of your onions, you will have to spray with Royal MH around the moment 10% of the onions have been ironed under good conditions.
Last year we noticed that growing conditions were far from ideal. It's definitely not going to be easy this year either. There is a lot of double flower, sometimes moderate foliage and in some fields the damage from thrips is so great that the right advice may be not to apply sprout inhibition, but to set the onions early.
Moment of spraying
Under ideal conditions, Royal MH is used when approximately 10% of the onions have been ironed. When deploying Royal MH, focus on the average image of a plot. Don't wait for the very last small onion and don't be alarmed by a precursor that irons just a little earlier.
Circumstances
Royal MH should be absorbed by the crop. So opt for deployment when the weather conditions (and the crop) also allow absorption of the agent. Over the years, the best spraying moment is often just in the early evening. Also pay attention to sufficient drying time and add a bonding agent if necessary.
Design