Reduced cost approached to herbicide and fungicide use on cereals in Scotland
About this project
Many trials took place in the arable areas of Scotland for harvest in the years 1990 to 1992. The fungicide trials used a range of varieties and tested a range of programmes with low dose fungicide mixtures on winter wheat and spring barley. The herbicide trials used a range of products or tank mixes, alone or in sequence and at a range of doses.
On winter wheat, a half dose programme based on prochloraz products for the early sprays and a triazole-protectant mix for the later sprays was consistently cost effective for Hornet and Riband. A low dose of morpholine was added when mildew or yellow rust threatened. For Hornet, this was estimated to be more cost-effective than the full dose programme in 94% of the situations represented by the trials. For Apollo, a cheaper half dose programme primarily aimed at mildew was estimated to be more cost effective than the full dose in 70% of Scottish situations.
For spring barley, a quarter dose mixture of fenpropimorph with either propiconazole or flusilazole and applied twice was more cost effective than two full doses of morpholine in 64 to 97% of situations, depending on variety. Success of the low dose programme depends on the applications being made early in the development of mildew.
Excellent broad-leaved weed control in winter cereals was achieved by a quarter dose of a product with diflufenican or pendimethalin applied in the autumn, followed by a quarter dose of mecoprop (or mecoprop P) in spring. The second dose was not needed in more than half of the trials. The quarter dose sequence was successful in 82% to 92% of situations.
A high level of weed control was less easily achieved for spring barley. The most effective products tested were a tank mix of metsulfuron-methyl with mecoprop and a proprietary mix of ioxynil, bromoxynil and fluroxypyr. These had a success rate of 55% at the quarter dose but did not always leave a clean crop when the full dose was used. Despite being weedy, the highest yields of spring barley were at the quarter or half dose.
The results reported here have had a major influence on advice given to farmers by SAC and other Advisers in Scotland and our Current Advice is summarised.
Related research projects
- Developing sustainable management methods for clubroot
- Understanding resistance to decrease risk of severe phoma stem canker on oilseed rape
- Investigating a potential new variant of Zymoseptoria tritici, causal agent of septoria leaf blotch, and implications for UK winter wheat varieties
- Investigation of high levels of erucic acid in consignments of double-zero oilseed rape varieties
- Multiple herbicide resistance in grass weeds
- Molecular characterisation of the rhynchosporium commune interaction with barley (Phd)
- Ramularia Leaf Spot in barley
- Hands Free Hectare 2: Autonomous farming machinery for cereals production
- ‘Added value fallows’ The use of customised cover cropping approaches within integrated grass weed management
- Arable Crop Disease Alert System