Exochomus

Redtenbacher, 1843

Exochomus is a of in the , 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.

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Habitat

Agricultural and forestry where soft-bodied occur. Specific documented include okra plantations in Egypt, cassava fields in Central Africa, and various plants of 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, or established for ).

Diet

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

Host Associations

Phenacoccus solenopsis - cotton ; major of E. nigripennis in Egypt
Icerya seychellarum - seychellarum ; of E. nigripennis
Phenacoccus manihoti - ; primary of E. flaviventris in Central Africa
Maconellicoccus hirsutus - pink ; of E. nigromaculatus
Abelmoschus esculentus - associated with okra; of P. solenopsis in Egypt
Manihot esculenta - associated with cassava; of P. manihoti in Central Africa

Life Cycle

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

Behavior

females use olfactory cues to locate , detecting -induced volatiles emitted systemically from infested plants. females can assess 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 exhibit highest predatory capacity in some .

Ecological Role

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

Human Relevance

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

Similar Taxa

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

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 preferences.

Prey-mediated effects

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