Chrysomelids rely on acuity of vision and chemical perceptions to recognize characteristics of their specific host-plants. The mating behavior of C. asparagi, which is common for most Chrysomelidae, relies heavily on tactile and visual cues. Males ride on the back of females, while females exhibit such behaviors as kicking the males and moving their abdomen away in avoidance.
Communication Channels: visual ; tactile ; chemical
Perception Channels: visual ; chemical
Birds are significant predators of Crioceris asparagi, including ducks, chickens, and North American birds including house sparrows and eastern kingbirds. A few species of coccinellid beetles, Coleomegilla maculata and Hippodamia convergens prey on larvae and adult stages. Large carabid beetles also prey on C. asparagi, including Poecilus lucublandus, Pterostichus melanarius, Harpalus pennsylvanicus, and Harpalus erraticus. A melyrid beetle, Collops quadrimaculatus has been known to feed on eggs and larvae of C. asparagi. Additionally, Pentatomidae such as Podisus maculiventris and Stiretrus anchorago are known predators of the asparagus beetle larvae outside of Canada. A damsel bug, Nabis rufusculus, and an assassin bug, Sinea diadema, have both also been observed preying on larvae. The vespid wasp, Polistes fuscatus, damselfly, Ischnura positum, and lacewing, Chrysopa oculata, are all predators of the larvae as well.
C. asparagi will dodge predators by escaping to another part of the asparagus plant. At lower levels of predatory persistence, it will move to the opposite side of the stem, but when more highly threatened will fake death or run to a more distant location on the plant. The black and yellow-white coloration which is typical of Crioceris asparagi mimic those of a stinging insect and may deter predators; however, C. asparagi lacks the stripes of stinging insects and the strength of this defense is questionable. C. asparagi is less adapted to avoiding avian predators than C. duodecimpunctata, a closely related asparagus beetle, because it lacks the red-black coloration and stridulation which are used successfully by C. duodecimpunctata to ward off birds. Rarely does C. asparagi utilize flight or stridulation to defend against predators.
Known Predators:
Anti-predator Adaptations: mimic; aposematic
Crioceris asparagi has an oblong shape. It is typically 6 to 7 mm long, and is bluish-green with a red thorax marked with green. The pronotum is red and the elytra are yellow with a suture and three spots on each side. The sutural stripe and spots are connected and the spots may vary in size. The elytra are also punctured repetitively in rows. Like all Criocerinae (leaf feeding beetles), it has thickset, eleven-jointed antennae that are inserted at the front of the eyes and are widely separated. Front coxae are conical, contiguous, and distinctive. Additionally, this subfamily of the chrysomelids has a prothorax which is narrower than the elytra at their base and there is typically a strong middle constriction. Tarsal claws are simple and broadly spread out from the base.
Eggs are elongate, conical, and large relative to adult body size. They are grey or brown in color. The larvae of this species range from dark grey to olive green and have both black legs and black heads.
Range length: 6 to 7 mm.
Other Physical Features: ectothermic ; heterothermic ; bilateral symmetry
Sexual Dimorphism: sexes alike
Little information is available about the lifespan of C. asparagi, but development from egg to an adult generally takes 22 to 41 days. Adults live for an extended period after that, with the final generation overwintering and emerging again in the spring.
Crioceris asparagi, the common asparagus beetle, lives on cultivated and feral asparagus, in agricultural fields and grasslands. In the winter, these beetles are found in piles of woody debris and refuse, under small rocks, in piles of decaying asparagus tops, and in the loosened bark of trees and fence posts.
Habitat Regions: temperate ; terrestrial
Terrestrial Biomes: savanna or grassland
Other Habitat Features: suburban ; agricultural
Crioceris asparagi is native to both Europe and northern Asia, with the exception of China. It is an introduced species in North America, and is particularly widespread in southern Canada. It is also an agricultural pest in Hawaii.
Biogeographic Regions: nearctic (Introduced ); palearctic (Native ); oceanic islands (Introduced )
Other Geographic Terms: holarctic
Crioceris asparagi feeds on asparagus during its larval and adult stages. Larvae eat the spears of asparagus as they grow during spring. In North America, it feeds exclusively on Asparagus officinalis, but in Europe and Asia it feeds on several different asparagus species.
Plant Foods: leaves; roots and tubers
Primary Diet: herbivore (Folivore )
Crioceris asparagi is monophagous in North America on its host plant, Asparagus officinalis, but oligophagous in other regions. These beetles serve as food to avian predators and numerous insects. They are host to a hymenopteran parasitoid known as Tetrastichus asparagi, which pierces the eggs of C. asparagi and oviposits its own eggs. The parasitized eggs of C. asparagi hatch and develop normally through the larval instars until it drops to the ground to pupate. Development stops there as the parasitic wasp has eaten the entire larva by this point. The level of parasitism on C. asparagi by C. asparagi can be as high as 70%. The ichneumonid wasp Lemophagus crioceritor parasitizes C. asparagi in Canada and cooler latitudes. The tachinid fly Myiopharus infernalis is a known, but uncommon, parasite. Impudentia crioceris is a fungus that is found on C. asparagi.
Species Used as Host:
Commensal/Parasitic Species:
There are no known positive effects of Crioceris asparagi on humans.
Since Crioceris aspargi feeds exclusively on asparagus, it can have a significant effect on the asparagus market. It can reduce the asparagus harvest, as well as decrease the market value when eggs or larvae are found on the plants. Washington, Michigan, and Illinois produce the most asparagus in the United States and are especially vulnerable to economic loss via asparagus damage.
Negative Impacts: crop pest
During the winter, the common asparagus beetle hibernates as an adult. It emerges and lays eggs when asparagus plants begin to shoot in the spring. Larvae hatch anywhere from 3 to 12 days later and immediately feed on young asparagus. They cling to the plant with tubercles and anal prolegs. There is a two to three week period of larval development with four instars. The final instar falls from the plant to the soil, and forms a pupa in a round earthen cell. In 5 to 8 days, the pupa transforms into an adult beetle. Climate determines how many generations (2 to 3) occur annually because the timing of egg hatching and larval development are heavily temperature dependent and will fluctuate, taking longer during colder seasons and taking less time when it is relatively warm in a region.
Development - Life Cycle: metamorphosis ; diapause
Crioceris asparagi has no special conservation status.
US Federal List: no special status
CITES: no special status
State of Michigan List: no special status
The mating system of Crioceris asparagi is typical of leaf feeding beetles. Chrysomelidae are known for relatively long mating associations during which males engage in such courtship displays as riding on the backs of females. Males do not court females prior to copulation but engage in "copulatory courting" and "post-copulatory courting." Mate guarding is typical of this family. In response, chrysomelid females will often exhibit avoidance behaviors such as moving their abdomens away from male genitalia or kicking males. Cryptic female choice within Chrysomelidae, where females mate with multiple males and retain the eggs of the male who they phenotypically prefer, is an interesting feature of this family. Females also control the ability of the male to fertilize. Females may have a spermathecal muscle that determines the success of sperm fertilization, and they may be able to emit semen post-copulation.
Mating System: polygynandrous (promiscuous)
Crioceris asparagi breeds in late April or early May after emerging from winter hibernation and feeding for a few days. Shortly after breeding comes oviposition. Eggs are deposited on leaves or spears as a single egg or in a group. Multiple eggs are laid in a row along the plant, and are secured by a dark green or brown adhesive that is secreted by the female.
Breeding interval: Crioceris asparagi breeds continuously throughout the spring.
Breeding season: Breeding season is late April or early May.
Key Reproductive Features: iteroparous ; seasonal breeding ; gonochoric/gonochoristic/dioecious (sexes separate); sexual ; fertilization (Internal ); oviparous
Females provide enough nutrients in the egg to allow early development. Additionally, females secrete a very strong adhesive that keeps eggs firmly secured to the asparagus plants. This adhesive protects the eggs from adverse weather conditions, increasing the likelihood the eggs will survive. C. asparagi provides no other parental involvement.
Parental Investment: pre-hatching/birth (Provisioning: Female)
The common asparagus beetle (Crioceris asparagi) is an important pest of asparagus crops both in Europe and in North America. Asparagus is its only food plant. The beetle is 6.0 mm to 9.5 mm long and slightly elongated. It is metallic blue-black in color with cream or yellow spots on its red-bordered elytra. The larvae are fat gray grubs with dark heads.[2][3]
The adult beetles and the larvae strip the needle-like leaves off the asparagus fronds, depriving the plants of the ability to photosynthesize and store energy for future years. Additionally, they chew the spears and lay a lot of eggs on them, rendering the crop unusable. The larvae feed on the plants for a few weeks, then drop to the ground to pupate. One year may see two or three generations of the beetle. The adults overwinter in a dormant state underground or in nearby leaf litter.
The parasitic wasp, Tetrastichus coeruleus, occurring mainly in the United States and Europe, can cause up to 71% mortality in the field and has been successfully used for biological control.[4][5]
Various insecticides (such as carbamates, pyrethroids, spinetoram, and spinosad) can be considered for pest control.[5][6][7]
The similar spotted asparagus beetle (Crioceris duodecimpunctata) is also a pest as an adult, feeding on tender shoots and leaves, but since the larvae feed only on the asparagus berries it is not considered to be as important.
Eggs of the asparagus beetle, laid on the stem of a flower of an asparagus plant
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Larva of Crioceris asparagi
Wikispecies has information related to Common asparagus beetle. The common asparagus beetle (Crioceris asparagi) is an important pest of asparagus crops both in Europe and in North America. Asparagus is its only food plant. The beetle is 6.0 mm to 9.5 mm long and slightly elongated. It is metallic blue-black in color with cream or yellow spots on its red-bordered elytra. The larvae are fat gray grubs with dark heads.
The adult beetles and the larvae strip the needle-like leaves off the asparagus fronds, depriving the plants of the ability to photosynthesize and store energy for future years. Additionally, they chew the spears and lay a lot of eggs on them, rendering the crop unusable. The larvae feed on the plants for a few weeks, then drop to the ground to pupate. One year may see two or three generations of the beetle. The adults overwinter in a dormant state underground or in nearby leaf litter.
The parasitic wasp, Tetrastichus coeruleus, occurring mainly in the United States and Europe, can cause up to 71% mortality in the field and has been successfully used for biological control.
Various insecticides (such as carbamates, pyrethroids, spinetoram, and spinosad) can be considered for pest control.
The similar spotted asparagus beetle (Crioceris duodecimpunctata) is also a pest as an adult, feeding on tender shoots and leaves, but since the larvae feed only on the asparagus berries it is not considered to be as important.
Eggs of the asparagus beetle, laid on the stem of a flower of an asparagus plant
Larva of Crioceris asparagi
