Caterpillars on Pyracantha
Symptoms and damage
Caterpillars are probably one of the best known pest in the
garden and come in lots of different colours from green to black with
yellow stripes. The problem is they eat the leaves almost continuously, causing
significant plant damage. When they are small they tend to live on the
underside of leaves so are hard to spot but as they get bigger they tend to turn
to the top of leaves.
Caterpillars can be controlled with pesticides but if you use a
contact one (one that needs to touch the caterpillar to kill it) make sure you
spray the underside of leaves. Systemic pesticides are better as they are taken
in by the plant which then acts as a poison in the plant and then when the
caterpillars eat the leaves they get poisoned and die. To find a suitable
pesticide head down to your local garden centre and look for one that says its
effective against caterpillars.