Rake up and remove leaves from shrubs (such as roses) that have exhibited disease. These leaves are likely to contain spores that will re-infect the plants next year.
Commercial sprays have a good track record in repelling deer. Spray every two to four weeks, and rotate among two to three products to keep the deer from growing accustomed to the scents.
If weather is dry, water deeply any trees or shrubs planted within the past year.
Aim to complete your planting activities by November. However, if you need to plant a tree or shrub, make sure to water it deeply, and add a protective layer of mulch to the ground to prevent the soil from freezing. Late plantings in exposed areas will also benefit from the erection of windbreaks on the northwest side of the plant. Remember that evergreens are subject to desiccation in winter, especially if they have not become established. Overall, the later you plant evergreens, the greater the change of winter damage.
This is a good time to inspect your trees and shrubs for scale insects. Cherry and Otto Luyken Laurels are notorious for white peach scale infestations. If you find scale, spray with dormant oil in late November and again in early spring.
Prune suckers from crape myrtles and forsythia. Prune all dead, damaged, or diseased branches any time of the year. See Deciduous and Evergreen Tree Pruning Schedules and a Shrub Pruning Calendar in the references below. Many can be pruned in November.