Return To Page Two
Chewing Insects
Page Three

Hibiscus Beetle

Size: X 4.0
Commonly called Hibiscus Beetle scientific name is Macoura concolor (Macleay)
This Beetle is satin black, oval in shape & tapered at each end to facilitate easy entry between the closed folds of petals of the Hibiscus flower buds.
It is about 3 mm long & belongs to the family Nitidulidae.
Often found in large numbers within the Hibiscus flowers.
It is predominately a pollen & nectar feeder, although they are known to damage the petals.
Damage to foliage has not been recorded.
The Hibiscus Beetle will consume the pollen of the unopened flower bud the females lay eggs near the nectary & the damaged bud drops from the bush prior to Opening.
The bud decays quickly & the larva hatch out consuming the bud remains.
A short pupal stage is undergone beneath the soil, where upon the adult beetle emerges to complete the cycle.
Hibiscus populations closely coincide with warm temperatures & flowers production.
The lighter colours of white, pink, & yellow, seem to attract more hibiscus than the less brighter colours of red, dark orange & browns.
 Hibiscus Beetle On
Yellow Hibiscus Flower
Size: X 30.0
Hibiscus Beetle Consuming Pollen of Hibiscus
.Size: X 3.0.................Size: X 5.0...................Size: X 15.0
Hibiscus Beetle
Entering Flower Bud
Size: X 3.0
Hibiscus Flower Buds
Damaged by Hibiscus Beetle
Size: X 2.0



...Size: X 10.0

Common name for most members of the beetle super family Curculionoidea. The adult weevil is usually dull in color and is herbivorous. It is characterized by a prolongation of the anterior part of the head into a rostrum (a beak like extension). The apex of the rostrum contains the biting mouth parts, and two clubbed antennae are attached in depressions at each side. The oval body is covered with a rough, hard integument, and a single median suture traverses the lower part of the head. Weevils exhibit complete metamorphosis.
The larvae are white, semicircular, fleshy grubs with vestigial legs, strong jaws, and rudimentary eyes; they feed entirely on plant life, causing much damage to crops. The adults usually hibernate for most of the winter.

Weevil Larvae
Size: X 40.0
Names that have been applied to families or subfamilies of weevils include fungus weevils (Anthribidae), straight-snouted or primitive weevils (Brentidae), snout beetles or snout weevils (Curculionidae), leaf-rolling weevils (Eremninae, Leptopiinae, Tanymecinae, Thylacitinae, Brachyrhininae), grain weevils (Rhyncho-phorinae), pine weevils (Pissodinae), clover weevils (Hyperinae), ant like weevils (Myrmecinae), flea weevils (Rhyncharninae), acorn and nut weevils (Curculioninae), and short-snouted weevils (Otiorhynchinae).
The largest family, Curculionidae, comprises several subfamilies and contains 30,000 to 40,000 species. Most are grouped under the subfamily Curculioninae, of which Curculio is the characteristic genus. This genus, which contains the nut and acorn weevils, has species characterized by a bulky body and a long, slender beak. In the female, the beak is usually longer than the entire body; it is used for drilling holes in nuts or acorns and for placing the eggs in the kernels. (Squirrels often open acorns in search of the larvae.) When the nuts fall to the ground, the larvae burrow underground and pupate the following July. The adults average 0.7 cm (0.3 in) from the front margin of the head to the tip of the abdomen. Some weevils of the family Curculionidae spend much of the adult and larval stages within various fruits. See also Boll Weevil .
The tiny granary weevil, Sitophilus granarius, of the subfamily Rhynchophorinae, is chestnut brown or black. The females produce numerous eggs six times a year and deposit them inside the grain kernels. The similar rice weevil, S. oryzae, is native to India and infests rice and other grains throughout the world. It is a common pantry pest, found frequently in crackers, packaged cereals, or other dried foods. The alfalfa weevil, Hypera postica, native to Europe, causes extensive damage to the leaves of the alfalfa crop. Brought to Utah in the early 1900s, it spread later into all the Rocky Mountain states and, more recently, into California and Washington.
Another group of beetles commonly known as weevils, but more closely related to the leaf beetles of the family Chrysomelidae, are the bean or pea weevils of the family Bruchidae. The pea weevil, Bruchus pisorum, lays numerous eggs once a year on the pods of young peas, the larvae boring into the seed to pupate. The bean weevil, Acanthoscelides obtectus, lays eggs on or within the bean pod.
 Different Species Of Adult Weevils
Sizes: X 15.0
Damage To Hibiscus
Leaves By Adult Weevil
 Size: X  0.50
 .Return To Page Two