Exochomus

Redtenbacher, 1843

Species Guides

Exochomus aethiops(Ebony Shield Lady Beetle)
Exochomus californicus Casey, 1899
Exochomus childreni
Exochomus fasciatus(Batman Lady Beetle)
Exochomus marginipennis(Margined Lady Beetle)
Exochomus metallicus
Exochomus subrotundus
Exochomus townsendi

Exochomus is a of lady beetles in the Coccinellidae, first described by Redtenbacher in 1843. The genus comprises at least 77 recognized distributed globally. Multiple species have been studied as agents against and other soft-bodied pests in agricultural and forestry systems. Research has focused particularly on E. nigripennis in Egypt and E. flaviventris in Central Africa as of mealybug species.

Exochomus by (c) Trevor Van Loon, some rights reserved (CC BY), uploaded by Trevor Van Loon. Used under a CC-BY license.

Exochomus by (c) Alan Manson, some rights reserved (CC BY), uploaded by Alan Manson. Used under a CC-BY license.

Exochomus townsendi by (c) Jared Shorma, some rights reserved (CC BY), uploaded by Jared Shorma. Used under a CC-BY license.

Pronunciation

How to pronounce Exochomus: //ɛkˈsɒkəməs//

These audio files are automatically generated. While they are not always 100% accurate, they are a good starting point.

Images

Habitat

Agricultural and forestry where soft-bodied prey occur. Specific documented include okra plantations in Egypt, cassava fields in Central Africa, and various plants of mealybug prey. Laboratory rearing conditions for studied indicate for temperatures around 28°C with moderate to high humidity.

Distribution

Global distribution. Documented occurrence records from Denmark, Norway, and Sweden (GBIF). -specific distributions include Central Africa (E. flaviventris) and Egypt (E. nigripennis, introduced or established for ).

Diet

Soft-bodied insects, particularly (Coccoidea). Documented prey includes Phenacoccus solenopsis, Icerya seychellarum, Phenacoccus manihoti, and . Sugar supplementation enhances in at least some .

Host Associations

Phenacoccus solenopsis - preycotton mealybug; major prey of E. nigripennis in Egypt
Icerya seychellarum - preyseychellarum mealybug; prey of E. nigripennis
Phenacoccus manihoti - preycassava mealybug; primary prey of E. flaviventris in Central Africa
Maconellicoccus hirsutus - preypink mealybug; prey of E. nigromaculatus
Abelmoschus esculentus - associated with prey okra; plant of P. solenopsis in Egypt
Manihot esculenta - associated with prey cassava; plant of P. manihoti in Central Africa

Life Cycle

Complete with , four larval instars, pupa, and stages. Egg incubation approximately 6.6-6.9 days in E. nigripennis. Pupal period 4.86-8.17 days, varying by prey . Total development ranges from 22.8 days to 30.4 days depending on prey species and plant. Development rate and survival strongly influenced by prey quality and host plant of prey.

Behavior

females use olfactory cues to locate prey , detecting herbivore-induced plant volatiles emitted systemically from infested plants. Gravid females can assess patch suitability from a distance, detecting females and parasitized prey via olfaction. Females avoid plants with conspecific females present, preferring plants with only conspecific males or unparasitized prey. Fourth instar larvae exhibit highest predatory capacity in some .

Ecological Role

of sap-sucking insects, particularly . Considered a viable agent for programs against mealybug pests. E. flaviventris described as the most active predator of Phenacoccus manihoti in Central Africa. and effectiveness influenced by plant quality of prey.

Human Relevance

Studied and utilized as agent against economically damaging mealybug pests in agriculture. E. nigripennis has been assessed for mass rearing potential in Egypt against cotton and seychellarum . E. flaviventris important for cassava mealybug control in Central Africa. Effectiveness varies with prey and plant, requiring careful selection for biocontrol programs.

Similar Taxa

other Coccinellidae generaExochomus share general lady beetle but are distinguished by specific prey associations with and documented olfactory foraging that may differ from other coccinellid

More Details

Research focus on specific species

Most detailed biological knowledge derives from studies of E. nigripennis, E. flaviventris, and E. nigromaculatus. -level generalizations should be made cautiously as these show significant variation in development, , and prey preferences.

Prey-mediated effects

parameters including development time, , longevity, and predatory capacity are strongly influenced by both prey and the plant on which prey are reared. This complicates predictions of biocontrol efficacy across different agricultural systems.