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gle head; they change into the pupa stage in about 6 weeks. It is during this feeding stage that the thistle heads are destroyed and fail to provide the usual number of seeds.
Pupa: The pupa stage is spent inside the thistle head, where many pupation chambers are fomed. Each full-grown larva forms a pupation chamber for its development into a pupa. This pupal stage lasts for 7-10 days before emergence of the adult weevil.
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