Pythiaceous fungi and plant-parasitic nematodes in California pear orchards: II. Incidence and distribution of parasitic nematodes in orchard soils
AuthorsAlex M. French
B. F. Lownsbery
S. M. Ayoub
A. C. Weiner
Authors AffiliationsAlex M. French was Program Supervisor of Plant Nematology, Bureau of Plant Pathology, California Department of Agriculture, Sacramento; B. F. Lownsbery was Associate Nematologist, in the Experiment Station, Davis; S. M. Ayoub was Plant Nematologists, Bureau of Plant Pathology, California Department of Agriculture, Sacramento; A. C. Weiner was Plant Nematologists, Bureau of Plant Pathology, California Department of Agriculture, Sacramento; N. El-Gholl was now Plant Pathologist, Riverside County Department of Agriculture, Riverside.
Hilgardia 35(21):603-610. DOI:10.3733/hilg.v35n21p603. October 1964.
Plant-parasitic nematodes of various types are prevalent in the upper root zone of pear trees in California. Monthly samplings over a 12-month period, from the same 126 orchards mentioned above, showed that the dagger nematode Xiphinema americanum and the pin nematode Paratylenchus hamatus occurred in more than 90 per cent of the orchards and in all pear-growing areas of the state. Other nematodes frequently found were species of Tylenchorhynchus, Pratylenchus, Helicotylenchus, Meloidogyne, and Criconemoides. No direct relationship was indicated between pear decline and nematodes in orchard soils.
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Also in this issue:Pythiaceous fungi and plant-parasitic nematodes in California pear orchards: I. Occurrence and pathogenicity of pythiaceous fungi in orchard soils
Pythiaceous fungi and plant-parasitic nematodes in California pear orchards: III. Effect of reduction of nematode populations by soil fumigation on subsequent growth of pear seedlings