Alfalfa-pest
Guides
Adelphocoris
plant bugs
Adelphocoris is a genus of plant bugs in the family Miridae, tribe Mirini. Multiple species are significant agricultural pests, particularly in Chinese cotton production following widespread Bt cotton adoption. The genus includes at least three economically important species—A. suturalis, A. lineolatus, and A. fasciaticollis—that exhibit distinct geographic distributions, seasonal dynamics, and host plant associations. Species within this genus show complex life histories involving migratory behavior, diapause, and multi-generational development on diverse host plants.
Adelphocoris lineolatus
Lucerne bug, alfalfa plant bug
Adelphocoris lineolatus is a mirid bug native to the Old World that has become a significant agricultural pest following its introduction to North America in 1917. It primarily damages alfalfa and other legume crops through feeding on reproductive and vegetative structures. The species exhibits migratory behavior that facilitates rapid population dispersal and range expansion. In northern regions, it typically follows a univoltine life cycle with overwintering eggs, while southern populations may show partial second generation development.
Epicauta
Burning Blister Beetles
Epicauta is a large genus of blister beetles (family Meloidae) comprising approximately 360 described species. The genus exhibits a nearly cosmopolitan distribution, with native species on all continents except Australia and Antarctica. Adult Epicauta feed on plant foliage and flowers, while larvae are predatory specialists on grasshopper eggs. The genus is notable for producing cantharidin, a toxic terpenoid compound that serves as a chemical defense and can be lethal to vertebrates if ingested in sufficient quantities. Many species are significant agricultural pests, particularly of alfalfa and other forage crops, with documented cases of crop failure and livestock mortality from contaminated hay.
Epicauta fabricii
ashgray blister beetle
Epicauta fabricii, commonly known as the ashgray blister beetle, is a North American blister beetle in the family Meloidae. Adults feed on foliage of leguminous plants including honeylocust, black locust, alfalfa, sweet clover, wild indigo, soybean, and locoweed. Larvae are predatory, feeding on grasshopper eggs. The species belongs to the subgenus Macrobasis.
Epicauta vittata
striped blister beetle, old-fashioned potato beetle
Epicauta vittata is a blister beetle native to eastern North America, known for its distinctive black and yellow striped coloration and its status as a significant agricultural pest. Adults feed voraciously on a wide range of crop plants, particularly solanaceous species, and are capable of forming dense aggregations that move en masse through fields. The species contains cantharidin, a toxic terpenoid that poses serious health risks to livestock, particularly horses, when beetles are accidentally consumed in hay. The complex life cycle includes a mobile triungulin larval stage that parasitizes grasshopper egg cases before becoming a sedentary grub.
Erynnis funeralis
Funereal Duskywing
Erynnis funeralis, commonly known as the funereal duskywing, is a medium-sized skipper butterfly in the family Hesperiidae. It ranges from the southwestern United States through Mexico and Central America to South America. The species is distinguished from similar duskywings by its narrow forewing with a white fringe on the hindwing. Adults are active from February to October, with larvae feeding on various leguminous plants.
Lygus elisus
pale legume bug, lucerne plant bug
Lygus elisus is a plant bug species in the family Miridae, commonly known as the pale legume bug or lucerne plant bug. It is a significant agricultural pest of forage, fiber, and fruit crops, particularly alfalfa, cotton, and strawberries. The species is distributed across western North America from Alaska to northern Mexico, with established populations also reported in Oceania. Adults and nymphs feed on developing plant tissues using piercing-sucking mouthparts, causing economic damage including cat-faced berries in strawberry production. Female-produced sex pheromones have been identified and developed for monitoring and potential management applications.
Lygus hesperus
Western Tarnished Plant Bug
Lygus hesperus is a significant agricultural pest in western North America, causing extensive damage to cotton, strawberries, alfalfa seed, and other crops. In California alone, annual losses exceed $30 million in cotton and $40 million in strawberries. Adults overwinter in reproductive diapause triggered by short day lengths, resuming activity when conditions improve. The species has been the subject of extensive research on sampling methods, biological control, and insecticide resistance.
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keltoni
Lygus keltoni is a plant bug species in the family Miridae, recently distinguished from L. shulli. It is a documented pest of canola and alfalfa in western Canada, with laboratory studies confirming its life history parameters. The species occurs across North America from Canada through the western United States to Mexico.
Macrosiphum creelii
Western Vetch Aphid
Macrosiphum creelii is an aphid species in the family Aphididae, first described by Davis in 1914. It is commonly known as the Western Vetch Aphid and is associated with alfalfa (Medicago sativa) as a primary host plant. The species has been studied for its temperature-dependent survival and reproduction patterns.
Meloidae
Blister Beetles
Meloidae, commonly known as blister beetles, is a family of approximately 7,500 species worldwide within the order Coleoptera. Members are characterized by their production of cantharidin, a toxic terpenoid compound that serves as a potent chemical defense against predators. The family exhibits remarkable diversity in adult morphology, with some species displaying aposematic coloration while others are cryptically colored. Life histories are complex, typically involving hypermetamorphosis with mobile triungulin larvae that often parasitize grasshopper eggs or bee nests. Adults are primarily herbivorous, with many species feeding on flowers and foliage of various plants.
Plebejus melissa
Melissa Blue
The Melissa Blue (Plebejus melissa) is a small butterfly in the family Lycaenidae, native to western North America. This species has been extensively studied for its colonization of alfalfa as a novel host plant, representing a well-documented case of host range expansion. The Karner blue (P. m. samuelis), described by Vladimir Nabokov, is a federally endangered subspecies restricted to oak savanna and pine barren habitats in the upper Midwest.
Tegrodera latecincta
Soldier Blister Beetle, Iron Cross Blister Beetle
Tegrodera latecincta is a large, colorful blister beetle endemic to the Owens and Antelope valleys of eastern California. As the northernmost species in the genus Tegrodera, it is geographically isolated from its closest relative T. erosa by the San Gabriel and San Bernardino mountains, and from T. aloga by the Mojave Desert. Adults are active in late spring and early summer, often forming conspicuous feeding and mating aggregations. Like other meloid beetles, it possesses cantharidin in its hemolymph for chemical defense.