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Parasitoids of the Sawfly, Arge Pullata, in the Shennongjia National Nature Reserve

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Parasitoids of the Sawfly, Arge Pullata, in the Shennongjia National Nature Reserve Journal of Insect Science: Vol. 12 | Article 97 Li et al. Parasitoids of the sawfly, Arge pullata, in the Shennongjia National Nature Reserve Tao Li1,2a, Mao-Ling Sheng2b*, Shu-Ping Sun2c, You-Qing Luo1d 1The Key Laboratory for Silviculture and Conservation of Ministry of Education, Beijing Forestry University, Beijing 100083, P. R. China 2General Station of Forest Pest Management, State Forestry Administration, Shenyang Liaoning 110034, P. R. China Downloaded from Abstract Larvae of the argid sawfly, Arge pullata (Zaddach) (Hymenoptera: Argidae), feeds on leaves of birch (Betula spp.) in China, Europe, Siberia, and Japan. Parasitoids of A. pullata were studied in http://jinsectscience.oxfordjournals.org/ Shennongjia National Nature Reserve, Hubei Province, China, in 2009 and 2010. Five parasitoid species were found: Pleolophus suigensis (Uchida), Mastrus nigrus Sheng, Endasys parviventris nipponicus (Uchida) (Hymenoptera: Ichneumonidae), Vibrissina turrita (Meigen) (Diptera: Tachinidae) and Conura xanthostigma (Dalman) (Hymenoptera: Chalcididae). The average parasitism rate of A. pullata by parasitoids was as high as 11.0%. V. turrita was the dominant species, attacking 10.0% of the A. pullata cocoons. The emergence peak of V. turrita was from late May to early June. Three hyperparasitoids of V. turrita emerged from cocoons of A. pullata: Mesochorus ichneutese Uchida (Hymenoptera: Ichneumonidae), Pediobius sp. (Hymenoptera: Eulophidae), and Taeniogonalos maga (Teranishi) (Hymenoptera: Trigonalidae). by guest on November 17, 2015 Hyperparasitism rates were about 1.0% to 3.0%, with an average rate of 1.7%. Keywords: Betula spp., biological control, hyperparasitoid, parasitism rate, Vibrissina turrita Correspondence: a [email protected], b [email protected], c [email protected], d [email protected], * Corresponding author Editor: Nadir Erbilgin was editor of this paper. Received: 9 August 2011, Accepted: 6 February 2012 Copyright : This is an open access paper. We use the Creative Commons Attribution 3.0 license that permits unrestricted use, provided that the paper is properly attributed. ISSN: 1536-2442 | Vol. 12, Number 97 Cite this paper as: Li T, Sheng M-L, Sun S-P, Luo Y-Q. 2012. Parasitoids of the sawfly, Arge pullata, in the Shennongjia National Nature Reserve. Journal of Insect Science 12:97. Available online: http://www.insectscience.org/12.97 Journal of Insect Science | www.insectscience.org 1 Journal of Insect Science: Vol. 12 | Article 97 Li et al. Introduction damage forest trees (Wang et al. 1996; Zhang and Zhou 1996; Wang et al. 2000; Sheng and The argid sawfly, Arge pullata (Zaddach) Chen 2001; Sheng et al. 2002; Chen and (Hymenoptera: Argidae), is an injurious leaf Sheng 2007). Worldwide, little is known feeder of birch, Betula spp., in China, Europe, about parasitism of Argidae, although they Siberia, and Japan (Escherich 1942; Takizawa support a parasitoid complex that is highly 1962; Austara et al. 1984; Li and Yuan 1993; distinctive (Pschorn-Walcher and Kriegl Zhelochovtsev and Zinovjev 1995; Nuorteva 1965). and Nuorteva 2007; Hara and Shinohara 2008; Min et al. 2010). In China, this sawfly was Parasitoids play an important role in first recorded in Tianzhu and Yongdeng, biological control of agriculture and forest Gansu Province, and Huzhu, Qinghai pests. Up until now, only two parasitoids, Province. Heavy infestations in birch forests Endasys parviventiris nipponicus (Uchida) were caused by the larvae in Qilian Mountains and Mastrus nigrus Sheng (Hymenoptera: Downloaded from in 1991, in Huzhu County, Qinghai, in 1996 Ichneumonidae), have been reported on A. and 1997, and in Shennongjia Forest, Hubei, pullata (Min et al. 2010; Sheng and Zeng in 2008 and 2009 (Li and Yuan 1993; Qi 2010). The data on additional parasitoids 2000; Min et al. 2010). In addition to the presented here are important for http://jinsectscience.oxfordjournals.org/ damage to birch, the larvae of A. pullata have understanding the natural control of A. a toxin that, if ingested, causes poisoning of pullata, and future biological control effect sheep, cattle, and goats in Denmark against this economically important sawfly. (Brummerstedt et al. 1987; Thamsborg et al. 1987). Materials and Methods The biology, occurrence, and integrated Overwintering cocoons of A. pullata under the management of A. pullata have been studied bark of Betula spp. were collected on four by guest on November 17, 2015 less in China (Li and Yuan 1993; Qi 2000) occasions at the same site in Shennongjia than elsewhere. In Japan, this sawfly was first National Nature Reserve, Hubei Province, in recorded in Sugadaira, Nagano Prefecture, October 2009 and April 2010. The first central Honshu, where it had a univoltine life sample (N = 2971) was collected on 8 October cycle (Takizawa 1962). Hara and Shinohara 2009, whereas the additional three samples (N (2008) reviewed the taxonomy, distribution, = 4497, 12082 and 7075) were taken on 26 life history, and economic importance of A. April 2010. The cocoons were reared in the pullata in Sapporo, Hokkaido, where A. laboratory at room temperature, and misted pullata probably had two generations a year. with distilled water one to two times per week In China, A. pullata had a univoltine life cycle in order to prevent desiccation. After one (Li and Yuan 1993; Qi 2000). week, cocoons were stored individually in glass tubes (100 mm long and 15 mm in High population levels of sawflies are not diameter) with a piece of filter paper dipped in only affected by natural collapse, but are distilled water (to prevent desiccation), and regulated by natural enemies (Luo et al. plugged with absorbent cotton. 2005). In China, most studies on parasitoids of sawflies have involved Diprionidae, All cocoons were checked daily for sawfly Pamphiliidae, and some Tenthredinidae that and parasitoid emergence until late autumn. Journal of Insect Science | www.insectscience.org 2 Journal of Insect Science: Vol. 12 | Article 97 Li et al. Emerged parasitoid larvae and pupae were from 8.1% to 13.8%, with an average rate of kept in glass tubes at room temperature until 11.0% (Table 1). adult emergence. After emergence of sawflies and parasitoids was complete, all remaining Only seven adults of the three parasitic cocoons were dissected, and their condition ichneumonids, P. suigensis, M. nigrus, and E. (i.e., status of argid sawfly, and parasitism) parviventris nipponicus (Hymenoptera: was recorded. Ichneumonidae), emerged from the cocoons of A. pullata, and 0, 28, 26 and 25 larvae were Tachinid parasitoids were identified by Dr. discovered from dissecting host larvae of the Chun-Tian Zhang (Shenyang Normal samples 1-4, respectively. The larval University), chalcid parasitoids were ichneumonids were indistinguishable from identified by Dr. Yan-Zhou Zhang (Institute each other, so their parasitism rates were of Zoology, Chinese Academy of Sciences), pooled and discussed as a group. Parasitism trigonalid wasps were identified by Dr. David rates of A. pullata cocoons by ichneumonids Downloaded from R. Smith (Department of Entomology, were from 0.1% to 0.6%, with an average rate National Museum of Natural History, of 0.3%. Ichneumonids pupated inside the Smithsonian Institution, United States of sawfly cocoons after feeding on the sawfly America). All specimens were deposited in larva. Adults made an irregular emergence http://jinsectscience.oxfordjournals.org/ the Insect Museum, General Station of Forest hole in the sawfly cocoons when emerging. Pest Management, State Forestry Administration, P. R. China. V. turrita larvae developed in the body of final instar A. pullata larvae, and killed them after Parasitism rates data (p) were transformed by they emerged from hosts. The tachinid final arcsin(p)1/2 in order to better fit the instar larvae pupated inside or outside the assumptions of normality and homogeneity of sawfly cocoon until adult emergence. variances for ANOVA. The means were Emergence holes were observed on the sawfly by guest on November 17, 2015 analyzed by one-way ANOVA, followed by cocoons. One dead tachinid pupa was found the Ryan-Einot-Gabriel-Welsh (REGW) inside the final instar larva of A. pullata when multiple Q test (SPSS 13.0 for Windows) at α dissected. There were 401, 245, 694, and 535 = 0.05. adults tachinids that emerged from the cocoons of A. pullata in each sample, Results respectively. Parasitism rates of A. pullata larvae by V. turrita were from 7.0% to 13.5%, Parasitoids with an average rate of 10.0%. Five parasitoid species were reared from A. pullata: Pleolophus suigensis (Uchida), C. xanthostigma larvae developed in the body Mastrus nigrus Sheng, Endasys parviventris of final instar A. pullata larvae, killed them nipponicus (Uchida) (Hymenoptera: after they emerged from hosts, and pupated Ichneumonidae), Vibrissina turrita (Meigen) inside the sawfly cocoon until adult (Diptera: Tachinidae), and Conura emergence, leaving their puparium in the xanthostigma (Dalman) (Hymenoptera: sawfly cocoon. Parasitism rates of A. pullata Chalcididae). The overall parasitism rates of larvae by C. xanthostigma were from 0.1% to A. pullata larvae by these parasitoids ranged 1.6%, with an average rate of 0.6%. Journal of Insect Science | www.insectscience.org 3 Journal of Insect Science: Vol. 12 | Article 97 Li et al. There were significant differences in the parasitism rates among the three groups of parasitoids (F = 54.97; df = 2, 9; p < 0.001). V. turrita was the dominant parasitoid, with its parasitism rates being significantly higher than those of both ichneumonids and C. xanthostigma (p < 0.001). There were no significant differences in the parasitism rates Figure 1. Mean parasitism rates (+ SE, n = 4) of Arge pullata by between the latter two parasitoid groups (p > parasitoids in Shengnongjia. Bars with the same letter are not 0.05) (Figure 1). significantly different (ANOVA on arcsin (p)1/2 , followed by the Ryan-Einot-Gabriel-Welsh (REGW) multiple Q test, at : α = 0.05). High quality figures are available online. The seasonal occurrence of V. turrita adults emerging from final instar larvae of A. pullata Downloaded from was recorded in 2010 (Figure 2).
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