Description?
The caterpillars of the brown tail
moth are an orangey-brown colour with a dotted white line on each
side of their back. There are two bright red dots near to the tail
and they are fairly well covered by fine, reddish brown hairs. The
moths are actually white in colour and these survive in winter by
spinning a white tent around them.
Life Cycle?
These moths lay 200-300 eggs on the leaves of trees and shrubs
in late summer. Small caterpillars hatch and start to feed on the
leaves. To survive the winter they spin a white "tent" around
themselves and these can easily be seen when the leaves have
fallen. In the spring the caterpillars leave their winter home and
scatter amongst the foliage. They feed on the leaves until they are
about 2.5cm to 5cm long. Towards the end of the summer they moult,
pupate and emerge into adult moths.
Why are they a problem?
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Rash caused by Brown Tail Moth
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Brown Tail Moth numbers have increased in recent years. They may
strip all the leaves from trees and shrubs if they become
established.
The hairs on the caterpillars are very fine and if they are
touched will cause considerable irritation to the skin, which can
develop into a rash. Consult a doctor if this is severe.
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How can they be controlled?
The best way to control them is to
cut off the "tents" between September and April. They can be sealed
in a plastic bag and then either burnt or put in the dustbin or
taken to an amenity tip. The tents themselves should be disturbed
as little as possible and gloves should be worn to protect the
skin. If a lot of trees are affected or the caterpillars are
active, chemical control by spraying may be necessary. This is only
effective when the caterpillars are out of their tents which will
only be on dry days. Weather conditions must be ideal - it must not
be windy, nor raining and spraying should not be carried out in the
evening. All skin must be covered and protective clothing worn
(e.g., hat, overall, gloves, boots, goggles, etc).
There is a wide range of chemicals
available from most hardware stores or gardens centres. One that is
reasonably safe is Pyrethrum which is sold under several brand
names. Remember, other insects will be affected and you must follow
the manufacturer's instructions carefully. Spray the caterpillars,
the nests and the surrounding foliage. More than one spray
treatment may be required.
If you do not like using chemicals,
try a strong solution of washing up liquid in water (about one part
liquid to seven parts water) which may work. Remember that if used
in the sunshine it will damage the plants.
What should I do if I find some caterpillars?
If the caterpillars are in any of
the parks, highway verges or other public places,
contact Customer Services on (023) 9244
6017. They will investigate and treat if necessary.
If the caterpillars are on private
property follow the suggestions given above. They may strip leaves
but they are unlikely to kill the plant. Remember they will cause
skin irritation if touched so keep away if you can. If you cannot
deal with them yourself and you feel they have to be treated you
may wish to ask a neighbour to help. The Council can only carry out
a treatment on private property in extreme circumstances and then a
charge will be made.
Charges:
To find out about charges for Pest Control services follow
this link
here>>>
Telephone: (023) 9244 6017
Email: customer.services@havant.gov.uk
Visit: Customer Services reception in the
atrium of the Public Service Plaza, Civic Centre Road, Havant PO9
2AX