Small. Antennæ club-shaped, eleven-jointed. Tarsi five-jointed. A few
species live on carrion and on fungi, others under the bark of trees, a
few in flowers. To these last belongs the =Turnip Flower Beetle=
(_Meligethes æneus_); somewhat convex, elongated oval; shining metallic
greenish black, finely dotted. Occurs in the inflorescences of turnip,
rape, and allied species; also in the flowers of mustard, charlock, and
similar crucifers, and species of buttercup (_Ranunculus_). At the
beginning of spring, the turnip-flower beetle bores into the buds of
turnip, rape, etc., and, later on, attacks the flowers. It perforates
the petals, devours the stamens and pollen, and, lastly, the pistil. The
infested flowers wither. Three to four beetles are often found in a
single flower. The female soon lays her eggs, separately, in the ovary
of the flower. One to two weeks later the larvæ may be found in the
flowers, one or more in each. The larvæ, one-fiftieth of an inch long to
begin with, are, when ready to become pupæ, about one-fifth of an inch
long, cylindrical, yellowish white with blackish brown head; they have
three pairs of short thoracic legs, as well as a pair of caudal
pro-legs. Each segment of the body has two dark blotches on its upper
side. On an average, the larvæ reach their full size in four to five
weeks. They are first found at the bottom of the flower, where they gnaw
the stamens and ovary. They then wander from flower to flower, until
ready to become pupæ. If there are no more flowers in the neighbourhood
they attack the developing pods, first gnaw the green husk, then bore
through it and devour the young seeds. Become pupæ in the soil. The
beetle emerges after a fourteen days’ pupa rest. At least two, usually
three, sometimes four generations. _Remedy_: Rooting out charlock and
the species of buttercup. Selection of strongly growing varieties of
turnip, rape, etc., which blossom late (and therefore soon finish
blooming). Drill-culture.
Family: =Cryptophagidæ= (_Secret_-_eating Beetles_).
Public-domain text, read in full here on John Shaqi.
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