76983

Rosemary beetle

A table displaying which months are best to sow, plant and harvest.
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Time to act
Time to act

Do not Time to act in January

Do not Time to act in February

Do not Time to act in March

Do not Time to act in April

Do not Time to act in May

Do not Time to act in June

Do not Time to act in July

Do Time to act in August

Do Time to act in September

Do Time to act in October

Do Time to act in November

Do not Time to act in December

Purple-striped green beetles, 8mm long, congregate among the leaves, which they feed on. The beetles lay elongated eggs beneath the leaves from September and continue to do so on warm days right through winter. These hatch after a couple of weeks and the larvae feed on the plants for about three weeks before entering the soil to pupate. Two weeks later the adults emerge and continue munching through the leaves and laying their eggs.

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Symptoms

Holes in leaves and tiny elongated eggs left by 8mm-long green beetles with purple stripes.

Find it on

rosemary, lavender, sage, Russian sage, thyme

Organic

Pick off the adult beetles and larvae by hand and destroy.

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Chemical

Spray with an insecticide, thiocloprid, between late summer and spring. Avoid using insecticide when the plants are in flower as bees may also be killed.