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Blister beetles (Meloidae)

Blister beetles (family Meloidae) are a group of coleopteran insects characterized by the presence of cantharidin in their hemolymph. This chemical is a potent defensive toxin that causes severe blistering and irritation upon contact with human or animal skin. Due to these properties, handling these insects requires extreme caution during field operations.

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American blister beetle Meloe americanus Ash Gray Blister Beetle Epicauta fabricii Ash-gray blister beetle Epicauta cinerea Black blister beetle Epicauta pennsylvanica Black blister beetle Lytta ebenina Blister beetle Epicauta murina Blister beetle Epicauta pardalis Blister beetle Epicauta Blister beetle Epicauta tenuicollis Blister beetle Mylabris aperta Blister beetle Mylabris elegantissima Blister beetle Mylabris oculata Blister beetle Mylabris pustulata Blister beetle Mylabris Blister beetle Epicauta grammica Blister beetle Epicauta immaculata Blister beetle Epicauta tamara Blister beetle Epicauta apure Epicauta apure Blister beetles Lytta Blue-winged blister beetle Lytta cyanipennis Coryna Coryna Coryna hermanniae Coryna hermanniae Epicauta abadona Epicauta abadona Epicauta albicincta Epicauta albicincta Epicauta aragua Epicauta aragua Epicauta atomaria Epicauta atomaria Epicauta corvina Epicauta corvina Epicauta gorhami Epicauta gorhami Epicauta latitarsis Epicauta latitarsis Epicauta monachica Epicauta monachica Epicauta ocellata Epicauta ocellata Epicauta pestifera Epicauta pestifera Epicauta pilma Epicauta pilma Epicauta puncticollis Epicauta puncticollis Epicauta ruficeps Epicauta ruficeps Epicauta rufidorsum Epicauta rufidorsum Epicauta temexa Epicauta temexa Epicauta unilineata Epicauta unilineata Immaculate blister beetle Macrobasis immaculata Leopard blister beetle Epicauta leopardina Lytta dimidiata Lytta dimidiata Lytta insperata Lytta insperata Lytta stygica Lytta stygica Macrobasis Macrobasis Metallic blister beetle Pomphopoaea aenea Mylabris bihumerosa Mylabris bihumerosa Mylabris cichorii Mylabris cichorii Mylabris cincta Mylabris cincta Mylabris convexior Mylabris convexior Mylabris dicincta Mylabris dicincta Mylabris distincta Mylabris distincta Mylabris frolowi Mylabris frolowi Mylabris ligata Mylabris ligata Mylabris phalerata Mylabris phalerata Mylabris quadripunctata Mylabris quadripunctata Mylabris triangulifera Mylabris triangulifera Mylabris trigonalis Mylabris trigonalis Mylabris variabilis Mylabris variabilis Nuttall's Blister Beetle Lytta nuttalli Oil beetle Meloe impressus

Blister beetles (Meloidae)

Taxonomically, they belong to the order Coleoptera. Adult beetles are typically medium to large in size, often possessing soft elytra and vibrant warning coloration. Their biology is marked by a complex developmental process known as hypermetamorphosis, which often involves a parasitic stage, distinguishing them from most common agricultural pests.

These beetles are known for causing significant damage to a wide range of crops. They often congregate in large groups, feeding on vegetables, legumes such as alfalfa, beans, and soy, as well as potatoes and various ornamental plants. By voraciously feeding on leaves, flowers, and buds, they can defoliate entire patches of crops in a very short period, leading to substantial yield losses.

The life cycle of the Meloidae family is unique. Female beetles lay large clusters of eggs in the soil. The first-instar larvae, called triungulins, are highly mobile and are adapted to find prey, such as grasshopper egg pods or food stores in bee nests. As they progress through subsequent stages of development, they become less mobile and focus entirely on feeding until they reach the pupal stage.

  • Deep fall plowing to disrupt the pupation sites in the soil.
  • Weed management to eliminate alternative food sources for the beetles.
  • Monitoring fields during the early flowering stage of crops.
  • Application of registered contact insecticides when threshold levels are exceeded.
  • Manual removal of beetles where possible, using proper personal protective equipment.

Effective control measures focus on preventing large-scale infestations before they occur. Farmers should prioritize cultural practices, such as crop rotation and soil tillage, to minimize the population. When chemical interventions are necessary, choosing selective insecticides is vital to protect beneficial insects while effectively targeting the blister beetle population.