Gyranusoidea

Compere, 1947

Gyranusoidea is a of encyrtid established by Compere in 1947. The genus contains that are primary parasitoids of mealybugs (Pseudococcidae), with several species deployed as agents for agricultural pest management. Gyranusoidea tebygi is the most extensively studied species, introduced from India to West Africa in 1987 to control the , where it established readily and achieved significant pest suppression. Other species such as G. indica have been reported as parasitoids of additional mealybug pests including .

Pronunciation

How to pronounce Gyranusoidea: //ˌdʒaɪrəˌnʌsɔɪˈdiːə//

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Habitat

Agricultural ; specifically associated with crops infested by mealybug including mango, citrus, and hibiscus. The has been documented in mango orchards in India and established in West African agricultural landscapes following intentional introductions for .

Distribution

India (type locality for G. tebygi); West Africa (Togo, introduced and established); Colombia (San Andrés Island, G. indica); Brazil; Egypt; Maharashtra (India). Distribution primarily reflects documented introductions for and native ranges of described species.

Host Associations

Rastrococcus invadens - primary , primary for G. tebygi
Maconellicoccus hirsutus - primary hibiscus mealybug, for G. indica
Rastrococcus - primary -level association for G. tebygi on mango and citrus

Life Cycle

Gyranusoidea tebygi completes approximately two for each generation of its mealybug under controlled conditions. The exhibits a female-biased sex ratio. Developmental stages and detailed parameters have been quantified for G. tebygi in laboratory studies.

Behavior

Females of G. tebygi do not discriminate against previously parasitized by the congeneric competitor Anagyrus mangicola when examining, attacking, stinging, or ovipositing. When A. mangicola attacks first, it shows no significant competitive advantage; however, when A. mangicola follows G. tebygi by 4 or 24 hours, it wins larval competition in approximately 71% of cases. Multiple by different has been observed.

Ecological Role

Primary of mealybug pests in agricultural systems. G. tebygi functions as an effective agent, achieving significant suppression of within one year of introduction and establishment. The is subject to hyperparasitism by hymenopterans including Chartocerus , Prochiloneurus species, Tetrastichus sp., and Marietta leopardina, though hyperparasitism rates of 56-86% have not prevented successful biological control outcomes.

Human Relevance

Deployed as a agent for mealybug pests. G. tebygi was successfully introduced to Togo in 1987 and established across diverse ecological conditions, spreading up to 100 km from release points within the first year. The has been evaluated for stage selection and sex allocation strategies to optimize efficacy. Coexistence with competitor such as Anagyrus mangicola has been proposed as complementary for enhanced biological control.

Similar Taxa

AnagyrusBoth are encyrtid containing primary of mealybugs; G. tebygi and A. mangicola directly compete for and have been studied for dynamics. Anagyrus generally show superior larval competitive ability when second to attack.
EpidinocarsisBoth contain encyrtid of mealybugs used in ; E. lopezi and G. tebygi were introduced to Togo simultaneously and both are subject to similar hyperparasitoid complexes.