Insecta, Coleoptera, Harpalidae .
Description, Biology, Life Cycle, Damage, Common Names, Images
The beetles are scattered in crops and waste land. They feed on forest tree seeds: pine (Pinus), spruce (Picea), larch (Larix), on wheat seeds or strawberry achenes.
- Adult: the adults emerge from hibernation in spring. During the day, they hide under earth clods, grass or stones; at night, they gnaw the seeds and achenes. They can fly in the evening in swarms and land on strawberry fields. Mating and egg laying soon follow the resumption of activity.
- Larva: it has a mixed diet, gnawing the base of plants and attacking other insects. It overwinters in the ground, resumes feeding the following spring then pupates in the ground at a depth of a few centimetres.
- The complete cycle extends over two years, the larva, then the adult, each passing through a winter diapause.
On strawberry, the adult beetle tears away the achenes, occasionally cutting the skin and producing a wound, which rapidly causes the fruits to rot (*) .
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