AM new to gardening. We recently bought our first home and have
inherited some old rose bushes. They appear to have black spot.
What should I be doing at this time of the year to tidy the plants
up and get them looking healthy again for spring? Can I prune them
can be a real joy, but do need some work. You shouldn't get too
much Black Spot in New Plymouth, as it is not as humid as other
regions. However, to combat it you can use Yates Shield or Super
Shield. Alternate with other fungicides like Bravo. You can do a
light prune now to get the plants under control. Prune about one
third off at once, or as you pick flowers. Take out any dead or
badly diseased wood, and prune good shoots back to an outward pointing
bud. Throughout the winter use a winter spray programme of Yates
Champion Copper and Conqueror Oil until the spring growth shows.
Some very old rose bushes can be encouraged to put out growth if
you scrape off some of the old bark at the base with a wire brush.
Gardener, Issue 93, 2002, Page 20
Reproduced with permission from the former Weekend Gardener magazine. The views expressed here are not necessarily those of the RNZIH.