It is important for chrysanthemum stools to be pest free going into
the winter in order to get through the propagation phase pest free.
When plants get bigger and as spring temperatures rise aphid
populations will raise on outdoor vegetation.
Aphids can gain access to our greenhouses through open
ventilators; this is when a keen eye can spot a problem.
In view of the aphids capacity to multiply at an astonishing
rate it is important to treat even a small infestation immediately.
can be achieved by contact or systemic insecticide.
For the amateur grower Bifenthrin is available as an active
ingredient in many products, Imidachloprid
is another useful ingredient and is available as a systemic
insecticide in some products.
are also a number of non-chemical controls available through retail
the professional grower Imidachloprid, Bifenthrin and Deltamethrin are
commonly used active ingredients. However
a quick search in the UK pesticide guide will reveal other products.
is by far the most recommended product for aphid control.
It is systemic and has the advantage of longer lasting control
because it poisons the aphids immediately they begin to suck sap,
thereby avoiding movement from plant to plant resulting in the
transfer of virus diseases. Plants
treated before flowering should remain clear of the pest well into the
insecticides work effectively on leaves and stems.
Therefore it is important to ensue the plants are free of
aphids before the buds appear. It
is very difficult to control aphids on developing blooms.