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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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Hypomeces Hypomeces Hypsonotus Hypsonotus Hypsonotus alternatus Hypsonotus alternatus Imbricated snout beetle Epicaerus imbricatus Indian gray weevil Tanymecus indicus Ips avulsus Ips avulsus Ips calligraphus Ips calligraphus Ips integer Ips integer Ips mannsfeldi Ips mannsfeldi Ips ribbentropi Ips ribbentropi Irenimus Irenimus Iris weevil Lixus iridis Iris weevil Mononychus punctumalbum Iris weevil Mononychus vulpeculus Iris weevil Mononychus vittatus Isaniris Isaniris Isaniris decorsei Isaniris decorsei Island bark beetle Hypothenemus insularis Ivy bark beetle Kissophagus hederae Jaboticaba fruit weevil Conotrachelus myrciariae Jack pine cone beetle Conophthorus banksianae Japanese bark beetle Scolytus japonicus Japanese beet weevil Cleonis japonicus Japanese fruit beetle Coccotrypes japonicus Japanese leaf weevil Calomycterus setarius Japanese leaf weevil Phyllobius intrusus Japanese pinhole borer Crossotarsus niponicus Japanese weevil Calomycterus Japanese weevil Pseudocneorhinus bifasciatus Javanese coffee berry borer Hypothenemus javanus Jeffrey pine beetle Dendroctonus jeffreyi Juniper bark beetle Phloeosinus canadensis Juniper bark beetle Phloeosinus dentatus Juniper bark beetle Phloeosinus serratus Juniper bark beetle Phloeosinus punctatus Kabuzo Kabuzo kalshoveni Kabuzo Kabuzo Kadoyama ambrosia beetle Microperus kadoyamaensis Kissophagus Kissophagus Kissophagus fasciatus Kissophagus fasciatus Klug's Weevil Orthorhinus klugi Knechtel pine bark beetle Pityogenes knechteli Kola nut weevil Balanogastris kolae König's bark beetle Scolytus koenigi Korean oak platypus Platypus koryoensis Kuroshio shot hole borer Euwallacea kuroshio Kuschelorhynchus Kuschelorhynchus Lachnopus Lachnopus Lambert pine cone beetle Conophthorus lambertianae Larch bark beetle Ips cembrae Larch bark beetle Ips subelongatus Larch bark beetle Orthotomicus laricis Larch bark beetle Scolytus laricis Larch bark beetle Cryphalus laricis Larch weevil Pissodes cembrae Large elm bark beetle Scolytus major Large Elm Bark Beetle Scolytus scolytus Large pine bark beetle Hylastes macer Large pine shoot beetle Hylastes cunicularius Large pine weevil Hylobius abietis
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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.