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Rosemary leaf beetle

Dummer. ゛☀
2017년09월15일
If the shoots tips of rosemary and lavender are turning brown and dying back it could be the sign of an infestation of rosemary leaf beetle. These small beetles feed on the new shoot tips causing them to die back. They're easy to spot because they have metallic green and purple stripes across their backs. Their larvae, which are slug-like and pale grey in colour with a dark stripe down the side, also cause damage by feeding on the shoots as they grow.


Plants affected
Rosemary leaf beetles only feed on a small number of plant species which includes rosemary, lavender, sage and thyme.

Rosemary leaf beetles only feed on a small number of plant species which includes rosemary, lavender, sage and thyme.
About Rosemary leaf beetle
These attractive leaf beetles are an invasive species that first appeared in the UK in 1994.
Since their introduction, they've been spreading steadily throughout the southern counties of England.
The adult beetles are around 1cm long with metallic green and purple stripes down their wing cases.
They're usually found in groups on stems, or feeding on the new growth of plants.
The larvae are small slug-like grubs which are usually found on the underside of leaves. They are light grey with horizontal dark stripes along their body.
Adult beetles are usually first seen in late spring, although they remain largely stationary on plants until later in the year.
In late summer they'll begin to mate and lay eggs.
Eggs are usually laid on the underside of leaves and are around 2mm in length.
Larvae will hatch in about ten day's time and feed for a few weeks before dropping down to pupate below the soil surface.
Adults may continue to mate during warmer winter periods, although this is rare.
Treatment
Chemical
Products containing the following chemical ingredients are all effective on Rosemary leaf beetle
Pyrethrum
Natural fatty acids
Surfactant-based products
Note: It is important to read manufacturer's instructions for use and the associated safety data information before applying chemical treatments.
Organic
Regular observation in late spring each year is essential to prevent infestations establishing.
Removing adults and larvae by hand will help to reduce numbers. Shaking infested bushes over an old towel or sheet will enable large infestations to be collected and removed.
Netting and fleeces can be used to stop adults moving between plants.
There are currently no natural enemies commercially available to control rosemary leaf beetle.
Prevention
Check plants on a weekly basis for signs of infestation and deal with them as soon as they appear.
Encourage insectivorous birds by hanging feeders in the winter and provide nesting boxes in the spring.
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