NEWSLETTER APRIL 2017
AGRONOMY Oilseed rape crops are forward following the warm temperatures in mid-March, with first flowers beginning to appear the third week in March. As flowering progresses, pollen beetle will become less of a problem. With forward crops themid flowering fungicide timingmay be earlier this year, monitor fields as they progress. There are a lot of forward crops of wheat this year with many already receiving a robust growth regulator with the T0 fungicide. There have been sightings of active yellow rust, even in varieties that are not considered to be susceptible. A robust T1 fungicide will be required with product choice critical depending on what is happening in the field. Monitor carefully and consider using a SDHI fungicide if disease levels are high. Always add in a multi-site fungicide (chlorothanlonil or folpet) at the T1 timing as part of an anti –resistance strategy. Some winter barley crops may also have been sprayed but if not, there are very good responses in winter barley to SDHI fungicides at the T1 timing. Oats are also forward in places and will have been treated with growth regulators. Follow this up with another dose at the T1 timing. If not so forward, then make sure a robust treatment is applied at T1 and tidy up any weeds as necessary. A number of sp. barley crops have received their pre-emergence herbicide. If not, monitor germination and control broad leaved weeds in conjunction with trace elements as necessary. Where there are concerns of SU resistant weeds, the new Arylex range of herbicides look to be a good fit and with no following crops restrictions may be the product of choice when following sp. barley with stubble turnips. Spring pulse crops should have received their pre-emergence herbicide. Monitor for weevil attack from emergence, especially if warm. Treat at the first sign of damage and repeat
if necessary. If it is cold when peas emerge, especially on lighter soils, check the growing points for thrips. These cause a distortion of the growing point and slow the growth of peas. Sow linseed and sp. OSR into warming soils to encourage rapid emergence and get away from flea beetle. Treat with a pyrethroid at the first sign of damage. Winter beans will require treating for chocolate spot at mid-flowering. Sow maize when soil conditions are suitable and soils are warming up. This allows rapid establishment and aids weed control. Maize is a poor competitor early on, if enough moisture consider using a pre-emergence, any doubt wait and treat post- emergence. Fodder beet is also a very poor competitor early on. Apply a pre-emergence herbicide and follow- up rapidly with a post – emergence treatment when the weeds are at the cotyledon stage. Product choice will depend on the weed spectrum present. A second, post emergence herbicide will be necessary to control a further flush of weeds before the crop canopy meets and the beet starts to compete with the weeds. It will be a busy month with the sprayer so hopefully there will be numerous spraying opportunities.
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