Preliminary Investigation of Nematodes Inhabiting Banana Fields in Hawaii and their Management Options
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1 Preliminary Investigation of Nematodes Inhabiting Banana Fields in Hawaii and their Management Options Koon-Hui Wang Cerruti R.R. Hooks Roshan Mandahar University of Hawaii at Manoa PEPS
2 Nematode: A Hidden Pest of Banana Crop losses of banana due to plant-parasitic nematodes: Costa Rica 30-50% Panama 30-50% India 30-60% Ghana 56% Uganda 58% Nigeria 90% (Speijer and Fogain, 1999)
3 Outline Nematode parasites of banana Symptoms Nematode survey on banana farms in Hawaii Nematode management strategies
4 Key Nematode Pests of Banana Worldwide Burrowing nematode (Radopholus similis) Spiral nematode (Helicotylenchus multicinctus) Lesion nematode (Practylenchus spp.) Root-knot nematode (Meloidogyne spp.) Reniform nematode (Rotylenchulus reniformis) Hawaii Burrowing nematode (Radopholus similis) Root-knot nematode (Meloidogyne spp.) Reniform nematode (Rotylenchulus reniformis) Spiral nematode (Helicotylenchus spp.) Lesion nematode (Practylenchus spp.)
5 Migratory Endoparasitic Nematodes (Root-borrowing nematodes) Spiral Burrowing Lesion
6 Symptoms Root Lesions Dark red lesions on the outer part of roots. Lesions distributed throughout the cortex but not in the stele. Affecting the anchorage of the plant.
7 Symptoms (Continue) Reduce capability of plants to uptake nutrients. Prolonging of the vegetative cycle. Drastic reduction in bunch weight. Open wounding could result in colonization of fungi or bacteria. Toppling disease.
8 Sedentary Endoparasitic Nematodes Root-knot nematode Reniform nematode
9 Nematode Survey in Hawaii, 2007
10 Nematode Sampling 3 samples 5 cores / farm Mist chamber Elutriation
11 Burrowing Nematodes on Banana Roots Burrowing nematode No. nematodes/10 g dry root weight Ewa Kunia Waianae Waimanalo Wailua North Hilo Hilo Volcano1 Volcano2 Ulupalakua Haiku1 Haiku2 Waikapu Lanai City Oahu Big Island Maui Lanai
12 Spiral Nematodes on Banana Roots Spiral nematode * * * * * + H. multicinctus * * * * * * * 10 1 No. nematodes/10 g dry root weight Ewa Kunia Waianae Waimanalo Wailua North Hilo Hilo Volcano1 Volcano2 Ulupalakua Haiku1 Haiku2 Waikapu Lanai City Oahu Big Island Maui Lanai
13 Lesion Nematodes on Banana Roots No. nematodes/10 g dry root weight Ewa Kunia Waianae Waimanalo Wailua North Hilo Hilo Volcano1 Volcano2 Ulupalakua Haiku1 Haiku2 Waikapu Lanai City Lesion nematode Oahu Big Island Maui Lanai
14 Root-knot Nematodes in Soil of Banana Fields Root-knot nematode Ewa Kunia Waianae Waimanalo Wailua North Hilo Hilo Volcano1 Volcano2 Ulupalakua Haiku1 Haiku2 Waikapu Lanai City No. nematodes/250 cm3 soil Oahu Big Island Maui Lanai
15 Reniform Nematodes in Soil of Banana Fields Reniform nematode Ewa Kunia Waianae Waimanalo Wailua North Hilo Hilo Volcano1 Volcano2 Ulupalakua Haiku1 Haiku2 Waikapu Lanai City No. nematodes/250 cm3 soil Oahu Big Island Maui Lanai
16 Nematode Management Options Using nematode-free planting materials Chemical control Cultural practices Crop rotation Resistance and tolerance Biological control Nematode management in perennial system is challenging.
17 Using nematode-free planting materials Hot water treatment (commercial practice in Australia and Central and South America) Na-hypochlorite dip Tissue culture plantlets Root paring 55 C for 20 minutes Peeled banana corms nemaplex
18 Nematode Management Options Using nematode-free planting materials Chemical control Cultural practices Crop rotation Resistance and tolerance Biological control
19 Chemical Control Preplant fumigation (1,3-dichloropropene): Too costly for small-scale farmers, potentially contaminate ground water. Post-plant nematicide: Nemacur (fenamiphos): Special Local Needs label for Hawaii had expired on June 04, Mocap (ethoprop): post-plant application. DiTera: Biopesticide, hard to handle.
20 Nematode Management Options Using nematode-free planting materials Hot water treatment Na-hypochlorite dip Tissue culture plantlets Chemical control Cultural practices Crop rotation Resistance and tolerance Biological control
21 Fallow At least 6 months to be effective. Essential that all banana roots and suckers are destroyed. Martinique.. Roundup injection Fallow/tissue culture plant regime has extended banana field longevity from 3-4 to 6-10 years, in some cases contaminated fields are totally freed from burrowing nematodes.
22 Propping of plants
23 Nematode Management Options Using nematode-free planting materials Chemical control Cultural practices Crop rotation Resistance and tolerance Biological control
24 Crop Rotation Marigold Sunn hemp Tagetes patula Tagetes erecta Sorghum-sudangrass Crotalaria juncea Sorghum bicolor S. sudanense
25 Nematode Management Options Using nematode-free planting materials Chemical control Cultural practices Crop rotation Resistance and tolerance Biological control
26 Resistance and Tolerance No commercial variety is resistant to key nematode pests. Nematodes have never been the first priority for breeders. Panama disease epidemics led to the change of export cultivar from Gros Michel to Cavendish in Latin America exacerbated the problem of R. similis (Leach 1958). This led to the breeding work for resistance to R. similis in Honduras (FHIA) after the discovery of resistance in Pisang Jari buaya (Wehunt et al., 1978). Several lines were resistant (e.g. SH 3142) and tolerant to R. similis (FHIA -1).
27 Nematode Management Options Using nematode-free planting materials Chemical control Cultural practices Crop rotation Resistance and tolerance Biological control
28 Natural Enemies Pasteuria penetrans infecting a rootknot nematode
29 Root-knot Nematodes in Soil of Banana Fields * Root-knot nematode * * * + Pasteuria penetrans * * Ewa Kunia Waianae Waimanalo Wailua North Hilo Hilo Volcano1 Volcano2 Ulupalakua Haiku1 Haiku2 Waikapu Lanai City No. nematodes/250 cm3 soil Oahu Big Island Maui Lanai
30 Predatory nematodes Butlerius
31 Omnivorous and Predatory Nematodes 70 Omnivorous nematodes Non-organic Organic No. nematodes/250 cm3 soil Ewa Kunia Waianae Waimanalo Wailua North Hilo Hilo Volcano1 Volcano2 Ulupalakua Haiku1 Haiku2 Waikapu Lanai City Predatory nematodes Non-organic Organic
32 Nematophagous Fungi
33 Summary Spiral nematode, Helicotylenchus multicinctus, is a newly report nematode pest on banana plants in Hawaii. They occur in high abundance and high frequency. Burrowing and lesion nematodes are encountered less frequently. Natural enemies of root-knot nematodes are common in fields surveyed.
34 Acknowlegement Aloun Farm Jefts Farm Kahuku Farm Henry and Roulph Ige Alberta de Jetley Michael Tarring Lynn Richardson Chris/Nicole Yuen Tommy Maneses Guy and Rowena Moen Angela Kepler and Frank Rust Maui Tropical Plantation Michelle and John Steuremann Maureen and Tane Datta Joan LaMont Lawton Allenby and Mike Katz Sage Farm
35 Root gall and Egg Masses of Root-knot Nematodes
Koon-Hui Wang, Ph.d. Dept. Plant and Environmental Protection Sciences, CTAHR, University of Hawaii at Manoa, Honolulu, HI
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