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Investigations for the biological control in Fiji of the coconut stick-insect Graeffea crouanii (Le Guillou)

Published online by Cambridge University Press:  10 July 2009

R. W. Paine
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Extract

The stick-insect Graeffea crouanii (Le Guillou) is a pest of coconuts of local and sporadic importance in the south Pacific and there have been recent outbreaks on Taveuni Island, in the Fiji group. As there appear to be virtually no parasites of the nymphal stages, a preliminary search was made in 1960 for parasites of other palm-feeding Phasmatids in Melanesia. This revealed the presence of Tachinidae parasitising species of the genera Ophicrania and Megacrania, and in 1963–64 these were studied in the Solomon Islands. The Tachinidae comprise at least two species of Mycteromyiella: M. laetifica (Mesnil) attacking both O. leveri Günth. and a species of Megacrania in the western Solomons, and M. phasmatophaga Crosskey attacking 0. leveri and some other Phasmatid hosts on Guadalcanal. The early stages of both species of Mycteromyiella are briefly described and compared, with notes on their bionomics. There was no evidence of any egg parasite attacking Ophicrania in the Solomons.

O. leveri, which is very closely related to G. crouanii, has never caused significant damage to coconuts in the Solomon Islands, except on the small island of Savo, from which its Tachinid parasites appear to be absent. It is concluded that Mycteromyiella, especially M. laetifica, which appears to be fairly specific, may be an important factor in the control of O. leveri in the Solomons.

The principal hosts of O. leveri are the sago palm (Metroxylon salomonense) and species of arecoid palms in the forest, on all of which the insect has better scope for concealment than on coconuts. Collections of nearly 6,000 examples of O. leveri from sago palm on Kolombangara island, in the western Solomons, in August 1963-February 1964 showed an average parasitism by Mycteromyiella laetifica of 28 per cent. Eggs of the Tachinid are laid on nymphs of all instars as well as on adults. The host-survival rate was about 30 per cent, for nymphs and 50 per cent, for adults.

A small number of parasitised specimens of O. leveri from Kolombangara were released on Savo, but there was no evidence six months later that M. laetifica had become established there.

Breeding trials at Honiara showed that O. leveri could be reared successfully in captivity but not M. laetifica, which shows reluctance to mate in cages and has a narrow range of environmental tolerance in the pupal stage, in which a mortality of at least 70 per cent, seems unavoidable under the conditions practicable for transportation of this stage by air.

Between October 1963 and March 1964 nearly 960 puparia of M. laetifica were sent to Fiji. About half of them were used for breeding trials, which showed that the Tachinid could be reared through G. crouanii in captivity but could not be maintained. The rest were released on Taveuni, but a further outbreak of G. crouanii during 1965 yielded no evidence that M. laetifica had become established.

Material of M. phasmatophaga, which has a more restricted choice of environment than M. laetifica, but also a somewhat greater potentiality for killing its host, was obtained by exposing O. leveri on seedling coconut palms planted in the forest at Honiara. Quantities were insufficient for transmission to Fiji; 150 parasitised hosts were released on Savo but samples of O. leveri collected there six months later gave no indication of its establishment.

Despite this initial failure, it is considered that Mycteromyiella could bring about the control of G. crouanii in Fiji and other affected Pacific islands, and the means by which this might be achieved are discussed.

Type
Research Paper
Information
Bulletin of Entomological Research , Volume 57 , Issue 4 , June 1968 , pp. 567 - 604
Copyright
Copyright © Cambridge University Press 1968

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References

Baranov, N. (1934). Zur Kenntnis der parasitären Raupenfliegen der Salomonen, Neubritanniens, der Admiralitäts-Inseln, der Fidschi-Inseln und Neukale-doniens, nebst einer Bestimmungstabelle der orientalischen Sturmia-Arten.—Vet. Arh. 4 pp. 472–485.Google Scholar
Bolivar, I. & Ferriére, C. (1912). Orthoptera, Phasmidae, of the Seychelles.—Trans. Linn. Soc. Lond. 15 pp. 293–300.CrossRefGoogle Scholar
Brunner von Wattenwyl, K. (1868). In Graeffe, E.Reisen im Innern der Insel Viti-Levu.—NeujBl. nature. Ges. Zürich. 70 pp. 1–48.Google Scholar
Brunner von Wattenwyl, K. & Redtenbacher, J. (1907). Die Insektenfamilie der Phasmiden. Lief. 2 Phasmidae anareolatae pp. 181–589. Leipzig, W. Engelmann.Google Scholar
Cohic, F. (1950). Insect pests in the Wallis Islands and Futuna.—Tech. Pap. S. Pacif. Commn. no. 8, 25 pp.Google Scholar
Cohic, F. (1956). Parasites animaux des plantes cultivées en Nouvelle-Calédonie et dépendances.—91 pp. Nouméa, Inst, franc. Océanie.Google Scholar
Cohic, F. (1959). Enquête sur les parasites animaux d'intérêt agricole à Wallis.—69 pp. Nouméa, Inst. franc. Océanie.Google Scholar
Crosskey, R. W. (1968). A new species of Mycteromyiella (Diptera: Tachinidae) parasitic on Ophicrania leveri (Günther) (Phasmida: Phasmatidae) in the Solomon Islands.—Bull. ent. Res. 57 pp. 525–532.CrossRefGoogle Scholar
Debach, P. Ed. (1964). Biological control of insect pests and weeds.—844 pp. London, Chapman & Hall.Google Scholar
Eady, R. D. (1956). Two new species of the genus Paranastatus Masi (Hym Eupelmidae) from Fiji.—Bull. ent. Res. 47 pp. 61–67.CrossRefGoogle Scholar
Eisner, T. (1965). Defensive spray of a Phasmid insect.—Science 148 no.3672 pp. 966–968.CrossRefGoogle ScholarPubMed
Giglio-Tos, E. (1910). Fasmidi esotici del R. Museo Zoologico di Torino e del Museo Civico de Storia Naturali di Genova.—Boll. Musei Zool. Anat. Comp. R. Univ. Torino 25 no. 625, 57 pp.Google Scholar
Günther, K. (1928). Die Phasmoïden der Deutschen Kaiserin-Augusta-Fluss-Expedition 1912/13.—Mitt. zool. Mus. Berlin 14 pp. 597–746.Google Scholar
Günther, K. (1937). Über einige Orthopteren von der Salomon-Inseln und von vanikoro.—Mitt. at. ent. Ges. 8 pp. 3–10.Google Scholar
Hebard, M. (1935). Marquesan insects—II. The Dermaptera and Orthoptera of the Marquesas Islands.—Bull. Bernice P. Bishop Mus. no. 114 pp. 105–140.Google Scholar
Hinckley, A. D. (unpublished). Notes on the coconut stick-insect.—Report to the Department of Agriculture, Fiji, 20/11/61.Google Scholar
Hopkins, G. H. E. (1927). Pests of economic plants in Samoa and other Island groups.—Bull. ent. Res. 18 pp. 23–32.CrossRefGoogle Scholar
Jepson, F. P. (1911). Report on economic entomology.—Fiji Coun. Pap. no. 25, 89 pp.Google Scholar
Kaup, J. J. (1871). Neue Phasmidae.—Berl. ent. Z. 1871 pp. 25–42.CrossRefGoogle Scholar
Key, K. H. L. (1957). Kentromorphic phases in three species of Phasmatodae.—Aust. J. Zool. 5 pp. 247–284.CrossRefGoogle Scholar
Le Guillou, E. (1841). Description des Orthoptères nouveaux, recueillis pendant son voyage de circumnavigation sur la corvette Zelée.—Revue zool. 4 pp. 291–295.Google Scholar
Lever, R. J. A. W. (1935). Insects of the cocount palm in the British Solomon Islands, list 4.—Agric. Gaz. Br. Solomon Isl. 3 no. 4, pp. 6–7.Google Scholar
Lever, R. J. A. W. (1944). The coconut stick-insect.—Agric. J. Dep. Agric. Fiji 15 pp. 18–19.Google Scholar
Lever, R. J. A. W. (1947). Insect pests of some economic crops in Fiji, No. 2.—Bull. ent. Res. 38 pp. 137–143.CrossRefGoogle ScholarPubMed
Nakata, S. (1961). Some notes on the occurrence of Phasmatodea in Oceania.—Pacif. Insects Monogr. 2 pp. 107–121.Google Scholar
Neff, S. E. & Eisner, T. (1960). Note on two Tachinid parasites of the walking stick, Anisomorpha buprestoides (Stoll).—Bull. Brooklyn ent. Soc. 55 pp. 101–103.Google Scholar
O'connor, B. A. (1949). Some insect pests of Tonga.—Agric. J. Dep. Agric. Fiji. 20 pp. 47–57.Google Scholar
O'connor, B. A. (1959). Aerial spraying of coconut palms to control the coconut stick insect, Graeffea crouani Le Guill.—Agric. J. Dep. Agric. Fiji 29 pp. 138–141.Google Scholar
O'connor, B. A., Pillai, J. S. & Singh, S. R. (1954). Notes on the cocount stick insect, Graeffeacrouani Le Guill.—Agric. J. Dep. Agric. Fiji. 25 pp. 89–92.Google Scholar
Pagden, H. T. & Lever, R. J. A. W. (1935). Insects of the coconut palm and the present position of the coconut problem in the British Solomon Islands Protectorate.—Agric. Gaz. Br. Solomon Isl. 3 no. 1, pp. 2–22.Google Scholar
Pillai, J. S. (unpublished). Quarterly Reports to the Director, Department of Agriculture, Fiji, 1962–1963.Google Scholar
Risbec, J. (1937). Observations sur les parasites des plantes cultivées aux Nouvelles-Hébrides.—Faune Colon. franc. 6 fasc. 1, 214 pp. Paris, Soc. Edit. geogr., marit. colon.Google Scholar
Sharp, D. (1898). Account of the Phasmidae, with notes on the eggs. In Willey, A.Zoological Results based on material from New Britain, New Guinea, Loyalty Islands and elsewhere, collected during 1895–1897, pp. 75–94. Cambridge.Google Scholar
Simmonds, H. W. (1936). Entomology Division—Annual Report, 1935.—A. Bull. div. Rep. Dep. Agric. Fiji 1935 pp. 19–22.Google Scholar
Simmonds, H. W. (1938). Coconut pests and diseases in Melanesis and Southern Polynesia.—Bull. Dep. Agric. Fiji no. 20, 39 pp.Google Scholar
Singh, S. R. (unpublished). Reports to the Director, Department of Agriculture, Fiji, 1963–1965.Google Scholar
Stewart, M. A. (1937). Phasmid injury to the human eye.—Can. Ent. 69 pp. 84–86.CrossRefGoogle Scholar
Swezey, O. H. (1924). Notes on insect pests in Samoa.—Hawaii. Plrs’ Rec. 28 pp. 214–219.Google Scholar
Tepper, J. G. O. (1902). List of the described genera and species of the Australian and Polynesian Phasmidae.—Trans. R. Soc. S. Aust. 26 pp. 278–287.Google Scholar
Veitch, R. & Greenwood, W. (1921). The food plants or hosts of some Fijian insects.—Proc. Linn. Soc. N. S. W. 46 pp. 505–517.Google Scholar
Wegner, A. M. R. (1955). Biological notes on Megacrania wegneri Willemse and M. alpheus Westwood (Orthoptera, Phasmidae).—Treubia 23 pp. 47–52.Google Scholar
Whitmore, T. C. (1966). Guide to the forests of the British Solomon Islands.—208 pp. Oxford Univ. Pr.Google Scholar
Williemse, C. (1955). Description of a new species of Megacrania from Obi (Moluccas) with remarks on Megacrania alpheus Westwood (Orthoptera, Phasmidae).—Treubia 23 pp. 41–46.Google Scholar