BRUCHUS RUFIMANUS PDF

Originally native through much of Africa this species is now more or less cosmopolitan in distribution and common or abundant throughout most of its range; having been transported worldwide along with food products it is now considered to be a serious pest of a wide range of legume crops in Europe, North Africa and North America. In the U. Adults feed on pollen while the larvae feed within seeds, both in the field and among stored products, the main host is Vicia faba L. Among dry seed produce stored under artificial conditions the beetle may breed continuously and huge populations quickly build up with individual seeds hosting 5 or 6 larvae, and larvae move between seeds as they are consumed or dry out. In the wild the adults overwinter among leaf litter, moss or under bark etc.

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Originally native through much of Africa this species is now more or less cosmopolitan in distribution and common or abundant throughout most of its range; having been transported worldwide along with food products it is now considered to be a serious pest of a wide range of legume crops in Europe, North Africa and North America.

In the U. Adults feed on pollen while the larvae feed within seeds, both in the field and among stored products, the main host is Vicia faba L. Among dry seed produce stored under artificial conditions the beetle may breed continuously and huge populations quickly build up with individual seeds hosting 5 or 6 larvae, and larvae move between seeds as they are consumed or dry out. In the wild the adults overwinter among leaf litter, moss or under bark etc.

They move to the host early in the year by flight during the day and spend the nights under leaves or on flowerheads, in temperate regions they are sexually mature from late April or May when oviposition begins.

Eggs are laid on the outside of seed pods, up to 10 per pod and each female will produce up to eggs. Larvae emerge after weeks, bore into the pod, and begin feeding upon the seeds, they pass through three instars and are fully developed within about three months, at this time the pods may be crammed with larvae and the seeds destroyed or hollow. The fully grown larva cuts a circular cap in the pod from which the adult will emerge and then pupates, this stage lasts between 10 and 15 days and emerging adults disperse to feed on pollen and tender foliage.

Most adults will spend a period feeding and then may enter a diapause during the warmest part of the summer prior to overwintering, but slowly developing larvae and late season pupae will enter a diapause and overwinter inside the pods, producing adults in the spring.

Head hypognathous, densely punctured and covered with pale scales, rostrum short and broad, and with very deeply notched eyes that are almost crescent-shaped and strongly protruding behind the antennal insertions. Temples strongly contracted behind the eyes to a short and narrow neck.

Apical segment of palps cylindrical. Antennae segmented and robust; black with segments usually orange. Pronotum transverse and rounded anteriorly from a small but distinct lateral tooth, densely punctured and moderately densely covered with pale scale-like pubescence which is dense at the middle of the base and over the acute hind angles.

The hind margin is broadly produced backwards medially. Scutellum with dense pale scales. Elytra broadly oval and distinctly wider than the pronotum, with distinct, convex shoulders and separately rounded apices which leave the pygidium exposed. Each with 10 well impressed striae which end before the apex. Interstices flat and variously scaled; when fresh overall with a mixture of grey and cream scales and paler patches forming two transverse bands, one before and one after the middle, and the pattern of pale scales on the pronotal base and scutellum generally continues along the bases of interstices 1 and 2, and there is usually a prominent pale patch on interstice 3 before the middle.

Specimens quickly become worn. Abdomen with 5 visible sternites, the first much longer than the others, and the pygidium is covered with dense pale, almost white, scales.

The front legs are pale, red to yellow, and the middle and hind legs are dark although this may vary. Male middle tibia curved and strongly toothed inside at the apex, this tooth is very much weaker or even missing in the female. Hind tibiae almost straight, with two unequal teeth below the apex, the inner one much larger. The first segment of the hind tarsus is very long and curved. Fully winged, specimens fly strongly and may do so readily when disturbed.

Bruchus rufimanus Boheman, Broad-Bean Weevil.

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The Biology and Ecology of Bruchus rufimanus, the bean seed beetle

Bruchus rufimanus , commonly known as the broad bean weevil , broad bean beetle , or broad bean seed beetle is a leaf beetle which inhabits crops and fields, as well as some homes. It is a pest of faba beans Vicia faba L. The adult beetles feed on pollen, while their larvae tunnel in seeds destroying crops and moving on to new ones once they dry out. The broad bean beetle, B.

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