Cherry Gall

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    This autumn gall is caused by the tiny wasp Cynips quercusfolii.

    The life cycle is interesting and similar to that of many gall inducing insects: parthogenetic adults emerge in December to February, and lay their eggs in buds, when the bisexual generation induces purple or black galls in spring.

    So one insect, but two quite different alternating generations and two different types of gall.

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