As a result, there are many uneven cereal crops with some plants at three leaves and others just emerging. This is causing a problem for the timing of early post-emergence herbicides. In some fields flufenacet mixtures planned for pre-emergence were not applied because of inadequate drilling depth.
Now, uneven emergence is complicating the post-emergence timing.
Similarly, in barley, where chlortoluron is in the mix, it is best to wait until the three-leaf stage. But by the time backward plants have got there weeds in forward areas may be getting too big. Aphicides are being applied along with herbicides where seed was not Deter dressed.
Slugs have caused some problems particularly in cloddy areas and crops following oilseed rape. Regular inspections are vital until the crop is well established.
Oilseed rape crops are also variable in growth stage, but most are now fairly well established with a few being very lush. As yet there is little sign of phoma, but recent rain is likely to encourage it to develop. Once it reaches 10% of plants infected, or less in backward crops, fungicides should be applied.
For those planning to use propyzamide for weed control in oilseed rape, the soil is still too warm and dry for application. It is likely to be mid-November before soil conditions are suitable. Caution will be required, as rape plants are still emerging in some crops and will need to reach at least three leaves before propyzamide is applied.
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