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Reference · Pests

Weevils

Weevils (family Curculionidae) represent one of the largest families of beetles in the order Coleoptera. These insects are easily recognized by their distinctively elongated snouts, known as rostra, which they use to bore into plant tissues for feeding and laying eggs.

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Eucalyptus weevil Gonipterus scutellatus Eucalyptus weevil Gonipterus platensis Eucalyptus weevil Gonipterus notographus Eucalyptus weevil Gonipterus cinnamomeus Euophryum confine Euophryum confine Euphorbia bark beetle Thamnurgus euphorbiae Euplatypus hintzi Euplatypus hintzi European spruce bark beetle Ips European spruce bark beetle Polygraphus poligraphus European spruce bark beetle Fortiborus pilifer European spruce bark beetle Pseudips Eutinophaea Eutinophaea Eutinophaea bicristata Eutinophaea bicristata Eutyrhinus Eutyrhinus Euwallacea Euwallacea Euwallacea validus Euwallacea validus Exophthalmus similis Exophthalmus similis Exophthalmus weevil Exophthalmus Faustinus Faustinus Faustinus cubae Faustinus cubae Faustinus ovatipennis Faustinus ovatipennis Fern weevil Syagrius fulvitarsis Fern weevil Syagrius intrudens Fern weevil Syagrius Fig bark beetle Hylesinus fici Fig bark beetle Hypoborus ficus Fig bark beetle Hypoborus Fig weevil Aclees cribratus Fiji nut beetle Coccotrypes fijianus Fir bark beetle Cryphalus abietis Fir bark beetle Cryphalus piceae Fir bark beetle (Vorontsov's fir beetle) Pityokteines vorontzowi Fir engraver Pityokteines sparsus Fir engraver Scolytus ventralis Fir engraver beetle Pityokteines spinidens Fir engraver beetle Scolytus unispinosus Fir root bark beetle Pseudohylesinus grandis Fir weevil Pissodes piceae Five-spotted weevil Tychius quinquepunctatus Flathead borer Myoplatypus Flax weevil Miccotrogus lineellus Flea weevil Rhynchaenus Flea weevil Rhynchaenus subfasciatus Flea weevil Orchestes Flindersia gall mite Neomerimnetes flindersiae Florida leaf weevil Artipus floridanus Fortiborus Fortiborus Fortiborus macropterus Fortiborus macropterus Four-toothed bark beetle Pityogenes quadridens Four-toothed platypodid Oxoplatypus quadridentatus Four-tubercled weevil Amnemus quadrituberculatus Fritillaria weevil Ceutorhynchus fritillariae Fruit borer beetle Coccotrypes rotundicollis Fruit tree bark beetle Monarthrum mali Fruit weevil Conotrachelus dimidiatus Fruit weevil Conotrachelus setosus Fruit weevil Curculio dentipes Fruit weevil Tachypterellus consors Fruit weevil Tachypterellus Furcipus Furcipus
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Weevils

The damage caused by weevils varies significantly between species. Adults typically feed on leaves, buds, and flowers, often leaving characteristic notches along leaf margins. The larvae are often the most destructive stage, living inside roots, stems, seeds, or fruit, causing internal damage that leads to weakened plant structures or total loss of harvest.

The life cycle of a weevil includes four distinct stages: egg, larva, pupa, and adult. Most weevil species overwinter as adults in protected locations such as soil debris, leaf litter, or under tree bark. Once temperatures rise in the spring, they emerge, feed, and begin the reproductive cycle, with females depositing eggs into the plant tissues they have prepared.

Economically significant species include the granary weevil, which destroys stored grain, and the cotton boll weevil, known for devastating cotton crops. These pests have high reproductive rates and are highly adaptable, which makes them a constant threat to both field crops and horticultural plants worldwide.

  • Crop rotation to break the pest's life cycle.
  • Mechanical control methods, such as deep plowing to expose larvae and pupae.
  • Use of systemic insecticides when economic thresholds are reached.
  • Maintaining field hygiene by removing crop residues and weeds.
  • Biological control using predators or entomopathogenic fungi.