This year we have a
Black spot is one of the most prevalent fungal diseases on roses in New Zealand. It must be prevented as once it is in the leaves it cannot be cured and will spread very quickly.
I have 3 roses with
It is essential to attack the scale during the winter months, with repeated sprays of winter strength horticultural oil. The oil smothers the scales body preventing breathing and leading to the insects death.
Please can you outline a
Firstly, straight after your winter pruning is completed, apply a very thorough clean-up spray of horticulture oil such as Conqueror Oil and an application of Copper compound such as Copper Oxychloride.