Pseudleptomastix

Girault, 1915

Pseudleptomastix is a of encyrtid in the Encyrtidae, Tetracneminae. The genus was described by Girault in 1915. At least one , P. mexicana, has been employed as a agent against the papaya mealybug (Paracoccus marginatus) in India and other regions. This genus belongs to a family known for endoparasitism of scale insects and .

Pseudleptomastix mexicana by the Smithsonian. Used under a CC0 license.

Pronunciation

How to pronounce Pseudleptomastix: //ˌsuːd.lɛp.toʊˈmæs.tɪks//

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Distribution

The has been recorded in India (Tamil Nadu: Virudunagar and Tirunelveli districts) where P. mexicana was introduced as a agent. The type and other members likely originate from the Neotropical region based on the species epithet and introduction context for P. mexicana.

Host Associations

Paracoccus marginatus - Papaya mealybug; P. mexicana introduced to India specifically for of this pest

Behavior

P. mexicana has been observed to establish and persist in field conditions for at least 6 months following release. rates increase gradually over time, with field recovery documented up to 6 months post-release. The showed moderate field activity compared to co-released , accounting for 9.3-24.4% of parasitization in mulberry agroecosystems.

Ecological Role

agent for mealybug pests in agricultural systems. In combination with other encyrtid (particularly Acerophagus papayae), contributed to near-elimination of papaya mealybug (96.6% reduction) in mulberry gardens in Tamil Nadu, India.

Human Relevance

Used in programs against the papaya mealybug (Paracoccus marginatus), an pest damaging papaya, cassava, mulberry, and other crops. P. mexicana was mass-reared from cultures and released at 200 individuals per location as part of efforts in India since 2010.

Similar Taxa

LeptomastixSimilar name and both are encyrtid of ; distinguished by morphological characters established by Girault
AcerophagusCo-occurring encyrtid used for same target; P. mexicana showed lower field activity (9.3-24.4% ) compared to A. papayae (75.6-81.7%) in Tamil Nadu evaluations
AnagyrusAnother encyrtid used for mealybug ; P. mexicana outperformed A. loecki in field persistence in Indian evaluations

More Details

Taxonomic authority

described by Girault in 1915. The type and full species inventory for this genus require further verification from primary taxonomic literature.

Biological control evaluation

Field studies in Tamil Nadu, India showed P. mexicana ranked second in effectiveness among three introduced encyrtids, with superior persistence compared to Anagyrus loecki but lower proliferation than Acerophagus papayae. The maintained detectable field for at least 6 months post-release.