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Thomas W. Walters, John N. Pinkerton, Ekaterini Riga, Inga A. Zasada, Michael Particka, Harvey A. Yoshida and Chris Ishida

Plant–parasitic nematodes are major pests of red raspberry, reducing yield and cane growth, and leading to economic losses in many production regions ( Belair, 1991 ; McElroy, 1991 ; Szczygiel and Rebandel, 1988 ; Trudgill, 1986 ). Three plant–parasitic

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John R. Clark and Robert Robbins

Two replicated blueberry plantings, one containing one highbush, (Vaccinium corymbosum) two southern highbush and two rabbiteye (V.ashei) cultivars, and another containing one highbush and three rabbiteye cultivars were sampled in October, 1991 and plant parasitic nematodes extracted and counted. Additionally, 15 commercial rabbiteye plantings were sampled. Standard and southern highbush samples had total plant parasitic nematode levels of 228-451 nematodes/250 ml soil compared to 4-14 nematodes/250 ml soil for rabbiteye. No difference in nematode population was found among the standard highbush ('Bluecrop') and southern highbush ('Cooper', 'Gulfcoast') cultivars. Xiphinema americanum was the most common nematode species found, along with very small populations of Paratrichodorus minor. All commercial plantings had lower nematode levels in samples from the blueberry plants as compared to those from the sod middles between the rows. Nematode levels from commercial plantings ranged from 1477/250ml soil from blueberry plants and 11-1546/250 ml soil from the sod middles. Species found at high levels in the sod samples were usually distinctly different from those found associated with the blueberry plants.

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Cody L. Smith, Joshua H. Freeman, Nancy Kokalis-Burelle and William P. Wechter

Though little published data have been collected, it is commonly accepted that damage caused by soil-borne pathogens, such as FON and plant parasitic nematodes ( Meloidogyne spp.), has increased since the phase-out of methyl bromide. The ban on

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Wang Koon-Hui, Brent S. Sipes and Adelheid R. Kuehnle

Radopholus similis distribution in Anthurium plant tissue was determined in a greenhouse experiment. Two thousand mixed life stages of R. similis per plant were inoculated onto Anthurium cultivars `Alii' and `Midori'. Nine months later, nematodes per gram of tissue were determined from stem sections (0-3, 3-6, and above 6 cm from the base), the lowest leaf petiole, and root tissue. R. similis occurred in all stem sections, leaf petioles, and roots in both `Alii' and `Midori'. Nematode distribution differed between the two cultivars. `Midori' had higher numbers of nematode in the roots whereas `Alii' had higher numbers of nematode in the stem sections and first leaf petiole. Anthurium apical stem cuttings could be contaminated with R. similis and may not be a nematode-free propagation material.

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Rachel E. Rudolph, Lisa W. DeVetter, Chris Benedict and Inga A. Zasada

ubiquitous plant-parasitic nematode in the region. This nematode has a wide host range, including red raspberry and many common cover crop species, and it is thought to be a major contributor to red raspberry crop decline ( McElroy, 1977 ; Pinkerton et al

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D. Grant McCarty II, Sarah E. Eichler Inwood, Bonnie H. Ownley, Carl E. Sams, Annette L. Wszelaki and David M. Butler

comparable crop yields and control of soilborne plant pathogens, plant-parasitic nematodes, and weeds could be achieved. The use of ASD is one non-chemical approach that has shown promise in Japan, The Netherlands, Florida, and California ( Butler et al

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Anthony M. Ortiz, Brent S. Sipes, Susan C. Miyasaka and Alton S. Arakaki

through several possible mechanisms: 1) non-host or poor host status for plant–parasitic nematodes; 2) production of phytochemicals that are toxic and/or antagonistic toward pathogens; and 3) stimulation of antagonists of plant–parasitic nematodes

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Lijia Shi, Jinghui Wang, Zhifeng Gao, Xin Zhao, Francesco Di Gioia, Haichao Guo, Jason Hong, Monica Ozores-Hampton and Erin Rosskopf

Soilborne diseases and plant-parasitic nematodes have an adverse effect on vegetable crops, causing substantial yield reduction and economic loss. For years, CSF, based primarily on mixtures of methyl bromide and chloropicrin, was widely used for

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Francesco Di Gioia, Monica Ozores-Hampton, Jason Hong, Nancy Kokalis-Burelle, Joseph Albano, Xin Zhao, Zack Black, Zhifeng Gao, Chris Wilson, John Thomas, Kelly Moore, Marilyn Swisher, Haichao Guo and Erin N. Rosskopf

disinfestation” ( Shinmura et al., 1999 ), is considered as one of the most promising methods. Anaerobic soil disinfestation has proved to be effective against several soilborne fungal and bacterial plant diseases, and plant-parasitic nematodes and weeds, across

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Sally M. Schneider, Husein A. Ajwa, Thomas J. Trout and Suduan Gao

cool soils. Results presented here demonstrated that drip-irrigation technologies to deliver emulsified formulations of fumigants is promising for the control of plant parasitic nematodes. This technology has been successfully adopted by over 50% of