Greenly Garden

Strawberry blossom weevil: how to recognise and treat it

Pest

Strawberry blossom weevil
Photo: James K. Lindsey, CC BY-SA 3.0, Wikimedia Commons

Symptoms

  • Flower buds hang on a partly severed stalk, wither and drop without opening; the female lays an egg in the bud and then gnaws the stalk.
  • A small, curved, creamy-white larva with a brown head lives inside the withered bud.
  • Dull black weevils 2–4 mm long with fine grey hairs and a long snout on buds and flowers in spring.
  • Small round holes in petals and in young folded leaves.
  • Damage is patchy and worst near hedges and woodland; in a heavy attack most flowers can be lost.

Organic treatment

  • Pick up and destroy severed buds, on the plant and on the ground — the larvae develop inside them.
  • Brush or shake the plants over a light-coloured bowl to catch and destroy the adult weevils.
  • Spare spiders, ladybirds and birds; small parasitic wasps also attack the larvae.

Chemical treatment

  • Pyrethrins on the adult weevils before flowering, when the first severed buds appear; good spray cover is needed. Check the product is approved for strawberries in your country and follow the label dose and pre-harvest interval.

Reference information, not a guarantee. Read and follow the label of any product: dose, safety and the days to wait before harvest.

Prevention

  • From the start of flower-stalk growth in spring, check the plants weekly for severed buds and adult weevils.
  • Inspect first the edges of the bed next to hedges or woodland, where the adults overwinter in the leaf litter.
  • Early varieties and young plants suffer most; everbearing varieties usually make up for lost buds later in the season.

Plants it affects

Sources

Figures checked against these sources.

  1. en.wikipedia.org/wiki/Anthonomus_rubi
  2. uk.wikipedia.org/wiki/Довгоносик_малинний
  3. ru.wikipedia.org/wiki/Цветоед_малинный
  4. es.wikipedia.org/wiki/Anthonomus_rubi
  5. projectblue.blob.core.windows.net/media/Default/Horticulture/Publications/Strawberry bloss
  6. ages.at/en/plant/plant-health/pests-from-a-to-z/strawberry-blossom-weevil