Monitoring and removal of Wild Oats has to be started on time

26.6.2007

<div>The wild oats form the panicles at the beginning of July during early growth periods in Southern and Western Finland. Finding the first plants is the best and cheapest preventative control. The blocks have to be checked even if control has been performed by chemical means. This is how control is ensured. </div>

There is to be no delay in the removal of the wild oats
When the wild oats have formed the panicles, there is no longer time to spare. In a trial in 2005-2006 seeds taken from the panicles of the wild oats were taken weekly after the panicles had formed and the seeds were tested for germination. Two weeks after the panicles had formed the first seeds were able to germinate. If the wild oats are allowed to ripen, some of the seeds will fall onto the field long before the oat harvest. This is why the blocks have to be traversed using a vehicle track for example, and all of the wild oats have to be removed carefully. It is easiest to detect the wild oats against the light.

Removal and destruction of wild oats
The wild oats are pulled from the ground with the roots and the whole plant is put carefully into a bag without holes. The bag is removed from the field and destroyed for example by burning. It is not permitted to leave the bags on the edge of the field, but they absolutely must be destroyed.

Chemical control
If chemical control has been performed, with grains at the latest at the first node stage, it is worth starting the control weeding of the blocks in week 27 at the latest. It has been found that it takes longer on direct sown blocks for wild oats to start to grow. It is always possible, that small strips have been missed in the field while spraying or that wild oats have started to grow depending on the weather conditions after a control spraying. The plants left in the field drop their seeds and even a good control result on the rest of the block will be lost. A single lush wild oat plant can easily produce over 100 seeds.

Identification of wild oats
It is worth learning to identify wild oats. Sometimes there will occur so called fatuoids amongst cultivated oats that misleadingly look like wild oats. If you are unsure of whether it is normal oats or wild oats, send the plant to Evira’s Seed Testing and Organic Production Control Unit in Loimaa for identification (PL 111, 32201 Loimaa). The identification is free and a certificate is issued confirming it.

For more information, please contact:
Senior Inspector Jari Poikulainen, tel. +358 20 77 25325, +358 40 719 1075
Senior Officer Ritva Vallivaara-Pasto tel. +358 20 77 25320, +358 40 833 2482
firstname.lastname@evira.fi

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