jellyfish wrote:Hi, i have a 5 year old cherry tree and each year i get the same problem. It gets completly stunted by blackfly, this usually starts with a mass of black eggs under the leaves and just pretty much takes it over and stunts it. My question is, is there anything i can buy to prevent this or a spray i can use that wont be harmful for the cherries?..thx in advance for any replies
Black aphid that attack cherries start very early in the season. By the time you see the leaves curling and the mass of aphid inside the curled leaves it can be very difficult to get at them or find a spray that will deal with them as by then it will have to be systemic in its action.
If you can, spray the tree with one of the winter oil washes in the winter months as this will reduce the number of overwintering eggs.
In the early spring as the leaves start to open spray with something like a pyrethrum spray a couple of times before their numbers can build up.
The cherries won't be affected this early in the season and you should find that this will give you good control.