Journal of Nematology (2006) 38, p. 293 (Sipes)

B. Sipes (2006)
Plant-parasitic nematode survey of citrus in Hawaii
Journal of Nematology 38 (2), 293-293
Abstracts of Society of Nematologists 45th Annual Meeting, Lihue, Hawaii, 18-21 June 2006
Abstract: A survey was conducted to identify plant-parasitic nematodes found in citrus orchards in on the islands of Oahu and the Big Island of Hawaii. Samples were collected from grapefruit, lemon, lime, orange, pomelo, tangelo, and tangerine trees. Carrizo citrange and C-35 were common rootstocks but in most cases the rootstocks associated with the different scions were unknown. A soil sample of up to 250 cm³ was processed by elutriation and centrifugation to collect nematodes. A citrus root sample of up to 20 g was processed by mist extraction. Xiphinema sp. was the most common plant-parasitic nematode recovered in the soil and root samples, 23% of the total. Tylenchulus semipenetrans was recovered from 11% of the soil samples and 2% of the root samples. T. semipenetrans was found predominately on Oahu. Rotylenchulus reniformis was found in 19% of all samples and also predominately on Oahu (37% of the Oahu soil samples). R. reniformis was never found in the root samples. Meloidogyne sp. were recovered in 7% of soil samples, all from the Big Island, and in only 5% of root samples. Meloidogyne sp. population densities were less than 100/per root sample in all but one sample in which the root population exceeded the soil population density by 100X. This population of Meloidogyne will be identified. Helicotylenchus sp. and several species of ring nematodes were also commonly recovered from the soil samples.
Database assignments for author(s): Brent S. Sipes

Research topic(s) for pests/diseases/weeds:
surveys/sampling/distribution

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Tylenchulus semipenetrans	Citrus (genus)	U.S.A. (Hawaii)
	Xiphinema (genus)	Citrus (genus)	U.S.A. (Hawaii)
	Rotylenchulus reniformis		U.S.A. (Hawaii)