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Plant-Parasitic Nematode Problems in the Pacific Islands 1 Journal of Nematology 20(2):173-183. 1988. © The Society of Nematologists 1988. Plant-parasitic Nematode Problems in the Pacific Islands 1 JOHN BRIDGE 2 Abstract: The Pacific islands have a diverse range of food and cash crops with indigenous and introduced nematode problems. The staple food crops have serious nematode pests, such as Meloi- dogyne spp. on sweet potato, Hirschmanniella miticausa causing corm rot of taro, and Pratylenchus coffeae and Radopholus sp. producing tuber dry rot of yams. Bananas are infested with P. coffeae or R. similis, citrus with Tylenchulus semipenetrans, rice with Aphelenchoides besseyi, and ginger with Me- loidogyne spp. and R. similis. Rotylenchulus reniformis, P. zeae, P. brachyurus, and Helicotylenchus spp. are important on all of these and other crops, such as sugarcane, passion fruit, pawpaw, and cassava. Meloidogyne spp. cause serious damage to local and introduced leaf and fruit vegetables and other crops, such as tobacco, sugarcane, pawpaw, black pepper, and pyrethrum. Many other plant-parasitic genera and species, some undescribed, occur in the Pacific, and there are many islands still to be investigated. Key words: Pacific islands, plant-parasitic nematode. The multitude of islands that constitute survey work and provided by other nema- the island groups and countries in the Pa- tologists and scientists working in the Pa- cific hold a fascination for most scientists cific islands. Th e complete list of nematode because of their diversity in crops and peo- genera and species identified from the re- ples, their unusual flora and fauna, and es- gion (Table 1) is derived from surveys and pecially because of their many unknowns. taxonomic publications of nematodes col- They have in common an isolation by dis- lected in the Pacific (4,5,11,21,23,29,30, tance and water from the main land masses. 37-43,52,56,62,63).The nematodes dis- Nematology is in its infancy in this part cussed are those known to cause crop dam- of the world; few of the islands have been age, those to which evidence clearly points surveyed for plant-parasitic nematodes as being important plant parasites, and (Table 1), most of this work being done those that pose a potential threat to crops during the past decade. Some islands, such in the Pacific islands. They are dealt with as those of Fiji, have been studied in detail, on a crop basis and listed in Table 2. Full but many are as yet untouched by nema- host lists and extensive lists of nematodes tological hands and many nematode prob- catalogued under their hosts can be found lems are still to be discovered. Therefore, in Bridge and Page (5), Fliege and Sikora the following compilation on plant-para- (11), Khair (23), Kirby et al. (30), and Or- sitic nematodes in the Pacific is not the ton Williams (39). definitive work but only the end of the be- ginning of our nematological knowledge. ROOT AND TUBER CROPS This review covers the islands north of Root and tuber crops play an important New Zealand and west to New Guinea, ex- part in the agricultural and traditional life cluding Hawaii which has been dealt with of the South Pacific islands. Many, such as separately. It consists of both published and yams (Dioscorea spp.), taro (CoIocasia escu- unpublished information collected during lenta), tannia (Xanthosoma sagittifolium), giant swamp taro (Cyrtosperma chamissonis), sweet potato (Ipomoea batatas), and cassava (Ma- Received for publication 4 August 1987. nihot esculenta), are important staple food 1 Symposium paper presented at the annual meeting of the Society of Nematologists, 19-22 July 1987, Honolulu, crops; some, such as ginger (Zingiber offi- Hawaii. cinale), are cash crops; and one, kava or Tropical Plant Nematology Advisory and Research Unit, CAB International Institute of Parasitology, St. Albans yaqona (Piper methysticum), is used for a nar- AL 4 0XU, UK. cotic beverage. 1 am grateful to scientists who have provided information for this review, in particular P. R. Speijer, D. S. Singh, S. R. Yams, Dioscorea spp.: Grown mainly for Gowen, and G. V. H. Jackson. their underground tubers, yams suffer from 173 174 Journal of Nematology, Volume 20, No. 2, April 1988 TABLE 1. Plant nematodes of the South Pacific. Nematode Distribution in island groupst Amphisbaenema amicorum TO A. paradoxiger S Aphelenchoides besseyi F, NG A. bicaudatus F, K, N, NG, S, TO, TU A. fragariae NO A. minor F A. ritzemabosi F Caloosia longicaudata F Criconemella curvata NG C. denoudeni F C. onoensis F, NG C. ornata S C. sphaerocephala F, NG C. xenoplax K, NO, TO Crossonema civellae NG C. fimbriatum NO Discocriconemella caudaventer F D. discolabia F, NG, TO D. limitanea S, TO Ditylenchus dipsaci NO Gracilacus aculenta NG G. aonli F G. enata F G. solivaga F Helicotylenchus californicus F H. crenacauda F, NG, S H. dihystera F, N, NG, NO, S, SO, TO, V H. egyptiensis F H. indicus F, NG, S, SO, TO H. microcephalus F, NG, S, TO H. mucronatus F, N, NG, S, SO, TO H. multicinctus F, K, N, NG, NO, S, SO, TO, TU, V H. paracanalis F H, pseudorobustus F H, pteracercus F H. retusus F, NG Hemicriconemoides cocophillus F, K, NG, S H. gaddi F, N, S, TO H. mangiferae F, S, TO Hemicycliophora vitiensis F, S Heterodera spp. F, K, NG, S, TO H. graminis F H. mothi F Hirschmanniella miticausa NG, SOL Hoplolaimus indicus NG H. seinhorsti F, NG, S Longidorus laevicapitatus NG, S Meloidog),ne arenaria F, N, NG, S, SO, TU M. hapla NG, NO M. incognita F, K, N, NG, NO, S, SO, TO, TU, V M. javanica F, K, N, NG, NO, S, TO Nothocriconema mutabile NO N. polynesianum NG, S, TO Ogma gracile F, S O. octangulare S Nematode Problems in the Pacific Islands: Bridge 175 TABLE 1. Continued. Nematode Distribution in island groupst Paralongidorus sacchari F Paratrichodorus acutus F P. minor F, NG P. porosus NG, NO Paratylenchus gabrici V P. humilis F P. leptus F P. nawadus F P. tui T Pratylenchus brachyurus F, N, S, TO, TU P. coffeae F, K, N, NG, P, S, SO, TO, V P. crenatus F P. penetrans NO P. zeae F, NG, S, TO Quinisulcius curvus K, N, S, TO RadophoIus similis F, G, N, NG, NO, P, S, SO, TO, Y R. williamsi F, NG, S, TO, TU, V Rotylenchoides valdeclarus S Rotylenchulus reniformis F, K, N, NG, S, SO, TO Rotylenchus breviglans NO R. gracilidens NO R. robustus NO R. unisexus NO Scutellonema brachyurum F, S, TO S. incisicaudatum NG S. insulare NG Sphaeronema sp. F, K, S, TO S)'ro hughdavidi NG S. melanesicus S, NG S. orphreyifer NG S. vexillatrix NG Trichodorus cylindricus NG Trophotylenchulus sp. NG Trophorus lomus TO Tylenchorhynchus annulatus F, NG ~'lenchulus semipenetrans F, N, NG, NO, S, TO Xenocriconemella macrodora NG Xiphinema americanum NO, S X. bacaniboia F X. basiri F X. brasiliense F, NG, S X. brevicolle F, K, N, S, TO X. elongatum F, S X. ensiculiferum F, N, NG, NO, S, SO, TO, V X. guirani NG X. insigne F, NG, S X. krugi F, S X. loosi NO X. opisthohysterum NO X. orthotenum F, NG X. pachtaicum NO X. papuanum NG X. rivesi S, TO X. simillimum V F = Fiji, G = Guam, K = Kiribati, N = Niue, NG = New Guinea, NO = Norfolk, P = Palau, S = Samoa, SO = Solomon Islands, TO = Tonga, TU = Tuvaln, V = Vanuatu, Y = Yap. TABLE 2. Crops of the Pacific islands and their associated nematode pests. Less important or less well known Crop Important nematode nematode pests Root and tuber crops Yams (Dioscorea spp.) Pratylenchus coffeae Rotylenchulus reniformis Radopholus similis Pratylenchus brachyurus Meloidogyne spp. Helicotylenchus mucronatus Taro (Colocasia esculenta) Hirschmanniella mitieausa Meloidogyne spp. Pratylenchus coffeae Rotylenchulus reniformis Radopholus spp. Helicotylenchus mucronatus Tannia (Xanthosoma sagittifolium) Pratylenchus eoffeae Meloidogyne spp. Rotylenchulus reniformis Giant swamp taro Radopholus similis Pratylenchus coffeae (Cyrtosperma chamissonis) Meloidog),ne spp. Sweet potato (Ipomoea batatas) Meloidogyne spp. Pratylenchus brachyurus Rotylenchulus reniformis P. coffeae Helicotylenchus mucronatus Radopholus spp. Ginger (Zingiber o2fi,cinale ) Radopholus similis Rotylenchulus reniformis Meloidogyne spp. CriconemeUa onoensis Pratylenchus coffeae Kava, Yaqona (Piper methysticum) Meloidogyne spp. Cassava (Manihot esculenta) Meloidogyne spp. Pratylenehus brachyurus P. coffeae RotyIenchulus reniformis Potato (Solanum tuberosum) Meloidogyne spp. Fruit crops Bananas (Musa spp.) Pratylenchus coffeae Meloidogyne spp. Radopholus similis Helieotylenchus mucronatus Helicotylenchus multicinctus Rotylenchulus reniformis Helicotylenchus microcephalus Citrus (Citrus spp.) Tylenchulus semipenetrans Passion fruit (Passiflora edulis) Rotylenchulus reniformis Meloidogyne spp. Pawpaw (Carica papaya) Rotylenchulus reniformis Meloidogyne spp. Pineapple (Ananas comosus) Rotylenchulus reniformis Meloidogyne spp. Vegetables Meloidogyne spp. Rotylenchulus reniformis Pratylenchus spp. Helicotylenchus spp. Field and Other Crops Rice (Oryza sativa) Aphelenchoides besseyi Pratylenchus zeae Meloidogyne spp. Criconemella spp. Sugarcane (Saccharum oaficinarum) Meloidogyne spp. Pratylenchus zeae Radopholus williamsi Tylenchorhynchus annulatus Hemicriconemoides cocophiUus Tobacco (Nicotiana tabacum) Meloidogyae spp. Maize (Zea mays) Pratylenchus zeae Meloidogyne hapla Peanut, Groundnut (Arachis Meloidogyne spp. hypogaea) Pratylenchus brachyurus Pyrethrum (Chrysanthemum Meloidogyne hapla cinerariaefolium) Vanilla (VaniUafragrans) Pratylenchus brachyurus Coffee (Coffea slop.) Rotylenchulus reniformis Black pepper (Piper nigrum) Meloidogyne incognita Rotyl~nchulus reniformis Nematode Problems in the Pacific Islands: Bridge 177 a serious disease known as dry rot which lenchus coffeae has been found associated initially affects the outer tissue layers of the with corm rot of tannia in Fiji (39). Meloi- tuber and can result in complete decay of dogyne spp. (M. incognita and M. javanica) the tubers during storage. Pratylenchus cof- are found in New Guinea, Fiji, and Tonga feae is the principal causal organism of the causing slight to severe galling of tannia disease in New Guinea (5), Solomon Islands roots and corms, and Rotylenchulus renifor- (2,13), and Vanuatu (12), and is found on mis is commonly associated with the crop yams in Fiji (30,39) and Niue and Tonga in the same three island groups (5,39).
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