David Kelly asked 12 years ago
I have a problem with greenfly in my greenhouse. I have tried several sprays both organic and commercial chemicals but to no avail. I was hoping to get some advice on doing something over the winter-the only problem is that the greenhouse is never empty. There are winter lettuces and some permanent residents like lemon and orange trees.
1 Answers
Gerry Daly Staff answered 6 years ago
It is not possible to completely clear a greenhouse of greenflies. There are new females arriving by flying in all the time. Different species affect different plants with some species more general.
The trick is to observe the arrivals and to use a control product in time before the big build-up of numbers take place.
Biological control methods are used commercially but these are difficult to manage successfully in a small greenhouse.
