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.

Rash caused by Brown Tail Moth

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.

 

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.

 

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: