Downy mildew: The weather is still suitable for downy mildew to spread on Hebes, pansy and roses under cover. For stock plants and crops under protection, spray with Aliette 80 WG, Amistar (SOLA 2009-2443), Filex/Proplant or Signum (SOLA 2009-1842) - watch for petal spotting on flowering plants. Liquid feeding in the autumn with potassium phosphite products can improve plant resistance to downy mildew.
Heaters: If you use diesel oil (35 second) for winter heaters, make sure that you have winter-grade oil in the tank for the coming season or you could get fuel gelling in the tank during the prolonged cold periods. For paraffin heaters (28 second), make sure that you obtain premium-grade paraffin or you could get leaf scorch from the sulphurous products of combustion - if you have direct-fired heaters. Priva heaters are the most efficient in this category and I rarely see damage where they are used.
Rust: There is quite a number of plant species that are still being attacked by rust. These include Heuchera and Saxifraga. If your plants are under protection and they are still active, then consider Amistar (SOLA 2009-0443), Bumper 250EC (SOLA 2009-0707) or Signum (SOLA 2009-1842), which are all systemic. Corbel can also be used but only on outdoor crops. Products with purely contact action include Cuprokylt.
Herbicides: Weed control in the autumn months needs special attention. This is the best time to be applying Roundup to perennial weeds. As the plant dies down for the winter, the glyphosate is taken into the plant. It continues to remain at a low level of activity all winter and suppresses regrowth next season, giving you a head start on the weeds. In non-cropped areas, add Chikara into the mix for a broader spectrum of weed control. In field-grown hardwood tree crops, consider Butisan S or low-rate Roundup directed at the soil (not over the crop). Dow Shield as a directed or hooded spray between field-grown roses will also clean up perennial weeds.
Hydrangeas: Do not bring Hydrangeas under cover until we have had the first few frosts and the leaves have fallen off. The flower bud initiation is enhanced by the period of cold. Bring them in too early and you will have fewer flowers next season.