Leatherjackets: Get control of newly emerged leatherjackets with Dursban WG drenches or New Draza pellets in smaller pots, 9cm and down, which seem to be the ones most affected. Spannit granules are best used for sand beds.
Tortrix caterpillars: Spray with Nemolt if you have a biological control programme in operation, or Toppel 10 if not. A range of pheromone traps are available to check moth levels.
Canker: Spray cherries with Cuprokylt at least twice before leaf drop to control over-wintering canker levels and prevent early infections next spring from old leaf debris.
Root aphid: Check for the presence of root aphids in pines and Ribes and control by drenching with Dursban WG or Intercept 70WG.
Nematode biocontrol: Start applications of nematodes for vine weevil larva control. The compost temperature will start to get cooler now on outdoor plants but with Nemasys L that is less of a problem. Nemaslug applications on plants like Hosta provide a better image when the plant is sold than displaying pellets.
Needle cast: Needle cast diseases of conifers can cause extreme worry in the spring. Control them this month by spraying Signum and then Bravo 500 or Dithane 945. Continue monthly spray applications until November.
Leaf hoppers: These pests still seem to be particularly active this month on French lavenders, sage and rosemary. Consider Chess WG at the tomato Specific Off-Label Approval (SOLA) rate, Gazelle, SB Plant Invigorator or Majestik. SOLAs are available for herb plants for Chess WG and Gazelle as well as Stalwart.
Herbicides: Weed control in the autumn months needs special attention. Top up container plants with Flexidor 125 before the winter. Field-grown trees and roses should be given a second herbicide application too. Cleaning up those troublesome perennial weeds - that somehow seem to get through the summer untouched - in field-grown hardwood tree crops can be done with propyzamide, half-rate sprays of Panther directed at the soil (not over the crop) or low-rate Roundup. Panther and Roundup must be applied as a directed spray under trees. Dow Shield as a directed or hooded spray between roses will also clean up perennial weeds.