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A Parasitoid of Conopomorpha Lychee Pests (Lepidoptera: Gracillariidae) in Thailand

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A Parasitoid of Conopomorpha Lychee Pests (Lepidoptera: Gracillariidae) in Thailand J. HYM. RES. Vol. 15(2), 2006, pp. 181–186 A New Species of the Genus Parachremylus Granger (Hymenoptera: Braconidae), a Parasitoid of Conopomorpha Lychee Pests (Lepidoptera: Gracillariidae) in Thailand SERGEY A. BELOKOBYLSKIJ AND KAORU MAETO (SAB) Zoological Institute Russian Academy of Sciences, St. Petersburg, 199034, Russia, and Museum and Institute of Zoology Polish Academy of Sciences, Wilcza 64, Warszawa 00-679, Poland; email: [email protected] (KM) Laboratory of Insect Science, Faculty of Agriculture, Kobe University, Rokkodai-machi 1-1, Nada-ku, Kobe 657-8501, Japan; email: [email protected] __________________________________________________________________________________________________________________________________________________________ Abstract.—Parachremylus litchii Belokobylskij & Maeto, new species, from Thailand is described as a parasitoid of larvae of Conopomorpha sinensis Bradley and C. litchiella Bradley, the major pests of lychee and longan in South-East Asia. The taxonomic position of Parachremylus and the range of the hosts of related genera of parasitoids are discussed. __________________________________________________________________________________________________________________________________________________________ Several insect pests are seriously threat- The genus Parachremylus with type spe- ening lychee (Litchi chinensis Sonn.) and cies P. seyrigi Granger was originally de- longan (Dimocarpus longan Lour.) (Sapin- scribed from Madagascar (Granger 1949); daceae) growers. They are the fruit borer this genus occurrs also in continental (Conopomorpha sinensis Bradley), leaf miner Africa—Nigeria and Niger (Wharton (Conopomorpha litchiella Bradley), longan 1993). Two additional species of this genus sucking bug (Tessaratoma papillosa Drury), have already been recorded from the fruit piercing moth (Othreis fullonia Oriental region. Parachremylus oblongus (Clerck)), and twig borer (Zeuzera coffeae (Papp) was described from India in the Nietner) (Menzel 2002). genus Avga Nixon (Papp 1990, 1997), and Conopomorpha sinensis, the lychee stem- P. temporalis Belokobylskij from Brunei end borer and the lychee fruit borer in (Belokobylskij 1999). A fourth species of China, Thailand and India, is the major this genus, similar to P. temporalis,is pest of lychee and longan in these coun- described below from Thailand. The sys- tries. Conopomorpha sinensis and the related tematic position of this genus is disputable. C. litchiella both attack lychee and longan, Parachremylus is included in the subfamily the latter preferring to mine leaves and Exothecinae (tribe Avgini: Belokobylskij shoots (Bradley 1986). There have been 1993), or conventionally in subfamily Hor- only tentative reports on braconid para- miinae (Wharton 1993). In spite of the sitoids of the pest Conopomorpha borers: different understanding of the contents of Phanerotoma sp., Pholetesor (Apanteles) sp., subfamilies, the position of this genus close and Colastes sp. (Menzel 2002, Anupunt to Avga Nixon is suggested by both and Sukhvibul 2005), but possibly infor- authors. Belokobylskij (1993) discussed mation about Colastes is due to misdeter- the relationships of these genera with mination. Here we report a new braconid Parahormius Nixon, Pseudohormius Tobias of the genus Parachremylus Granger as & Alexeev and Allobracon Gahan (5 Leur- a larval parasitoid of C. sinensis and C. inion Muesebeck), which share the loss of litchiella. the prepectal (epicnemial) carina on the 182 JOURNAL OF HYMENOPTERA RESEARCH mesosoma. Wharton (1993) provisionally vi, 1997, Supatra Dolsopon’’, ‘‘Host: Con- placed Avga near Parahormius and Pseudo- opomorpha sinensis larvae’’ (NIAES, ZISP). hormius and showed the possible relation- Description.—Female. Body length 2.6– ship of Avga and Parachremylus (shared 2.8 mm; fore wing length 2.5–2.6 mm. granulate mesonotal sculpture and the Antennae: thickened, almost filiform, 29– poorly developed propleural flange). How- 30-segmented, 1.1–1.2 times longer than ever, in his opinion, Allobracon does not body. Scapus 1.7–2.0 times longer than appear to be closely related to Parachremy- wide. First flagellar segment 2.5–2.8 times lus in spite of it sharing a number of longer than its apical width, 1.1–1.2 times features with Avga and Parahormius. longer than second segment. Penultimate The host of Parachremylus has not been segment 2.0–2.3 times longer than wide, known till now. The new species described 0.6–0.7 times as long as first flagellar below as P. litchii sp. nov. was reared from segment, 0.7–0.75 times as long as apical larvae of Conopomorpha sinensis and C. segment; the latter with distinct spine litchiella (Gracillariidae), both important apically. Head: width 1.8–2.0 times its pests of lychee and longan trees in South- median length, 1.25–1.4 times width of East Asia. The members of related genera mesoscutum. Temple very strongly and of the tribe Avgini (Parahormius, Avga, almost linearly narrowed behind eye (dor- Allobracon) are also recorded as parasitoids sal view). Transverse diameter of eye of the leaf-rollers or leaf-miners of the (dorsal view) 5.5–7.0 times longer than families Tortricidae, Gracillariidae, Lyone- temple length (7.0–7.7 times if measured on tiidae, Cosmopterigidae, Coleophoridae, straight line). Ocelli small, in triangle with and Gelechiidae (Belokobylskij 1993, Whar- base 1.1–1.15 times its sides. POL 0.7–1.0 ton 1993) as well as rarely (recorded for times Od, 0.3–0.5 times OOL. Vertex with Allobracon) of leaf-mining Coleoptera narrow median longitudinal furrow. Oc- (Wharton 1993). cipital carina dorsally distinctly curved The terms of wing venation are used as towards ocelli, rather widely interrupted defined by Belokobylskij and Tobias (1998). medially; not fused with hypostomal cari- The following abbreviations are used: na ventrally being obliterated for a short POL—postocellar line; OOL—ocular-ocellar distance. Eye large, sub-round, glabrous, line; Od—maximum diameter of lateral 1.1–1.2 times as high as broad. Malar space ocellus; NIAES—National Institute of 0.25–0.3 times height of eye, 0.8–0.9 times Agro-Environmental Sciences (Tsukuba, basal width of mandible. Face width 0.9 times height of eye and 1.2–1.25 times Japan); ZISP—Zoological Institute, Rus- height of face and clypeus combined. sian Academy of Sciences (St. Petersburg, Malar suture absent. Clypeal suture rather Russia). distinct and complete. Clypeus weakly Parachremylus litchii Belokobylskij & convex. Hypoclypeal depression sub- Maeto, new species round, its width 0.8–0.9 times distance (Figs 1–11) from edge of depression to eye, 0.35 times width of face. Head below eyes (front Holotype female.—‘‘Horticultural Re- view) strongly and almost linearly nar- search Center, Chiang Rai, Thailand, viii, rowed. Mesosoma: length 1.5–1.55 times its 1996, Supatra Dolsopon’’, ‘‘Host: Conopo- height. Mesoscutum highly and almost morpha litchiella larvae on Lychee or Lon- perpendicularly raised above pronotum gan’’ (NIAES). Paratypes. 2 females, 1 (lateral view), with rather fine longitudinal male, with the same labels as holotype medioposterior keel (dorsal view). Notauli (NIAES, ZISP); 5 females, ‘‘Horticultural rather narrow, shallow anteriorly on verti- Research Center, Chiang Rai, Thailand, 6. cal surface and very shallow to almost VOLUME 15, NUMBER 2, 2006 183 Figs 1–11. Parachremylus litchii sp. nov. 1, Head, frontal view. 2, Head, dorsal view. 3, Propodeum. 4, Six basal segments of antenna. 5, Mesosoma, lateral view. 6, Hind tibia and two basal segments of hind tarsus. 7, Metasoma, dorsal view. 8, Hind coxa. 9, Hind femur. 10, Fore wing. 11, Hind wing. 184 JOURNAL OF HYMENOPTERA RESEARCH absent on dorsal surface, finely sculptured. First-fourth segments of hind tarsus ven- Prescutellar depression short, shallow, trally with wide and transparent flanges, finely crenulate-granulate, 0.15–0.2 times which are pointed on the tops of each as long as scutellum. Scutellum almost flat. segment. Metasoma: 1.7–2.0 times longer Metanotum medially with small and ob- than its maximum width, 0.9–1.1 times as tuse tubercle. Subalar depression rather long as head and mesosoma combined. shallow, wide, densely and curvedly stri- First tergite strongly, uniformly and line- ate with fine granulation anteriorly. Ster- arly widened from base to apex; with small nauli shallow, rather wide, weakly curved, spiracular tubercles before its middle; entirely smooth. Wings: Length of fore laterally with distinct high and rather wide wing 2.8–3.0 times its maximum width. carinae; fine dorsal carinae fused in basal Radial cell not shortened, metacarpus 1.3 0.3 and then extending to apex as a single, times longer than pterostigma. Pterostigma elevated, median carina; dorsope absent. rather wide, 3.1–3.7 times longer than Apical width of first tergite 2.4–2.7 times its wide. Radial vein arising a little or rather basal width; its length 0.6–0.65 times apical distinctly before middle of pterostigma. width. Second suture rather distinct and Second radial abscissa 1.5–2.3 times longer convex. Second and third tergites with than first abscissa, 0.25–0.3 times as long as rather distinct and fine longitudinal medi- the straight third abscissa, 1.15–1.25 times an carina. Median length of second tergite longer than the weakly curved first radio- about half its basal width, equal to or 1.1– medial vein. Second radiomedial cell short, 1.2 times length of third tergite. Combined weakly narrowed towards apex, its length median length of second and third tergites 1.5–1.8 times maximum width, 0.9–1.1 nearly equal to basal width of second times length of brachial cell. First medial tergite, 0.7–0.75 times maximum width of abscissa rather distinctly S-shaped. Recur- tergites. Ovipositor sheath (visible part in rent vein 0.9–1.0 times as long as second lateral view) 1.1–1.3 times longer than first abscissa of medial vein. Discoidal cell 1.55– tergite, 1.0–1.2 times longer than hind 1.65 times longer than wide. Nervulus basitarsus, 0.25–0.4 times as long as meso- strongly postfurcal, distance from nervulus soma, 0.15–0.17 times as long as fore wing.
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