Now is the time for monitoring and removal of wild oats

5.7.2010

<p>Wild oats usually develop panicles in Southern and Western Finland at the beginning of July. Finding the first plants is the best and most inexpensive form of preventative control. The fields have to be checked even if chemical control measures have been implemented.</p>

The success of chemical control has to be checked as of mid-July
Chemical control shall always be verified through an inspection of the grains. Control weeding of the blocks should be started on week 28 at the latest and continued until harvesting. Wild oats can emerge throughout the summer.

Wild oats have been found to emerge over a long period of time in direct sown blocks. Wild oats can also sprout in any strips possibly left unsprayed.

In some areas blocks have had to be re-sown at the very end of May or beginning of June due to heavy rainfall. In these blocks the monitoring of wild oats can be deferred, but must not be left undone.

No time to be lost in removal of wild oats
When wild oats have developed panicles, there is no time to be lost as the first seeds will be able to germinate just two weeks after the panicles have emerged. If wild oats are allowed to ripen, some of the seeds will fall in the field long before harvesting. A single lush wild oat plant can easily produce hundreds of seeds.

All the blocks have to be gone through utilising the wheel tracks. It is easiest to detect the wild oats against the light and a binocular is a good tool for this. Weeding must be meticulous with all the wild oat plants removed. The wild oats are pulled from the ground with the roots and the whole plant is put carefully into an intact bag. The bag is removed from the field and destroyed for example by burning. The bags must not be left by the sides of the fields, but they must absolutely be destroyed.

How to identify wild oats
It pays to learn to identify wild oats. Sometimes so-called fatuoids, which are easy to mistake for wild oats, can appear among cultivated oats. If in doubt whether a plant is a normal oat or a wild oat plant, send it to Evira’s Seed Certification Unit in Loimaa for identification (address PL 111, 32201 Loimaa). The identification is free of charge and you will receive a certificate.

For more information, please contact:
Jari Poikulainen, inspector, Evira, tel. +358 (0) 20 772 5325, +358 (0) 40 719 1075
Juha Rantamäki, inspector, Evira, tel. +358 (0) 2077 25324, +358 (0) 40 551 8412
e-mail forename.surname@evira.fi

 

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