The summer is here, although it is a typical British
variable weather one at the moment!
However warm and wet conditions often
provide ideal conditions for certain pest species.
One insect species that can
be a pest is certain types of moth.
Recently there has been an influx of Diamond Back moths, of which the caterpillars can cause serious damage to brassica crops and plants.
Diamond Back Moth damage |
Another new invader is the Box Tree Caterpillar
moth, which has ended up in the south east of the U.K. , after originating from
South Asia. The larvae/ caterpillars of this species can have a devastating
impact on box plants and hedges.
Box Tree Caterpillar damage |
The plant leaves are shredded and box hedges
look like they have serious die back, although this must not be confused with
box blight, which is a different problem that box plants can experience. Box Tree Caterpillars eventually spin white webs around themselves as they pupate.
This can make treating against them even more difficult. If you think you have
a case of Box Tree Caterpillars , you can take part in a survey on the RHS
website to monitor where they are spreading to in the UK.
Box Tree Moth Trap |
To help and monitor
and control this pest, it is possible to use a Box Tree Caterpillar Moth trap.
This uses a specific pheromone to attract the male box tree moths to drop into
a funnel trap, where they are caught and drowned. This helps to prevent male
moths mating , which in turn reduces female egg laying and hence reduce the
development of the caterpillars.
If caterpillars do appear on the box, it is
possible to treat with a natural pyrethrum spray . This kills on contact but
does not persist on the plant to kill other insects and is not absorbed by the
plant. Natural pyrethrum is made from chryanth flowers and is a recognised
organic insecticide. One such product is Pyrol bug and larvae killer available
on the Dragonfli website along with the new Box Tree Caterpillar moth trap.
Lets keep these pests under control.
Julian
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