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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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Sareptan weevil Ceutorhynchus sareptanus Say's ambrosia beetle Anisandrus sayi Scaly weevil Barynotus squamosus Scepticus Scepticus Scepticus insularis Scepticus insularis Scepticus uniformis Scepticus uniformis Schwarz weevil Pissodes schwarzi Sciaphobus Sciaphobus Sciobius Sciobius Sciobius granosus weevil Sciobius granosus Sciobius horni Sciobius horni Sciopithes Sciopithes Sciopithes obscurus Sciopithes obscurus Scolytus Scolytus Scolytus kirschi Scolytus kirschi Secret platypus Platypus secretus Sedum weevil Alcidodes sedi Senegalese jumping weevil Ramphus senegalensis Sequoia bark beetle Phloeosinus sequoiae Sharp-winged weevil Lixus acutipennis Shensi pine bark beetle Phloeosinus shensi Shiny buprestid Amathynetoides nitidiventris Shirahoshizo Shirahoshizo Shirahoshizo weevil Shirahoshizo flavonotatus Shore flat-headed borer Platypus shoreanus Short-horned ambrosia beetle Platypus curtus Shot-hole borer Anisandrus dispar Shothole borer Scolytus rugulosus Sierra Leone palm borer Coccotrypes sierraleonensis Sigastus fascicularis Sigastus fascicularis Sigastus Weevil Sigastus Silky bark beetle Pseudohylesinus sericeus Sitka spruce beetle Pseudohylesinus sitchensis Sitona callosus Sitona callosus Sitona hispidulus Sitona hispidulus Sitona longulus Sitona longulus Six-spined ambrosia beetle Cyclorhipidion sexspinatum Six-toothed bark beetle Orthotomicus erosus Six-toothed bark beetle Ips sexdentatus Six-toothed bark beetle Pityogenes bistridentatus Six-toothed spruce bark beetle Pityogenes chalcographus Small ambrosia beetle Monarthrum minutum Small flower weevil Anthonomus pulicarius Small pine bark beetle Pityophthorus digestus Small pine bark beetle Pityophthorus rubidus Small spruce bark beetle Pityophthorus deletus Small spruce bark beetle Pityophthorus lautus Small spruce bark beetle Polygraphus subopacus Small spruce bark beetle Pityophthorus nitidulus Small spruce bark beetle Pityophthorus absonus Small spruce weevil Pissodes harcyniae Smaller elm bark beetle Scolytus minor Smaller elm bark beetle Scolytus pygmaeus Smaller European elm bark beetle Scolytus multistriatus Smicronyx Smicronyx Smooth Amphicranus Amphicranus rasilis Smooth bark beetle Pityophthorus glabratus Smooth bark beetle Dryocoetiops laevis Snake weevil Lixus anguinus Soft leaf weevil Polydrusus mollis
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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.