Effects of soil temperatures on spore increase of Pasteuria penetrans parasitizing Meloidogyne incognita in vinyl house conditions.
1993
Nakasono K. | Gaspard J.T. | Tateishi Y.
Kidney bean, sweet potato, spinach, and then sweet potato were grown in sequence in pots with soil infested with Meloidogyne incognita (Mi) and with or without an application of Pasteuria penetrans (Pp) endospores under high and low soil temperature vinyl house conditions for two years to measure the effects of temperature on Pp and Mi population dynamics. At high soil temperature Pp endospore numbers in soil increased from an initial application of 6.6 x 10(4)/g soil to 18, 34, and 127 x 10(4) after sweet potato, spinach, and sweet potato, respectively, while at low soil temperature Pp soil endospore numbers were 5, 16, and 12 x 10(4) in the same cropping order. Population changes of Mi juveniles were not significantly affected by the presence of Pp soil endospores at both high and low soil temperatures. A centrifugal extraction method for enumerating Pp soil endospore numbers is also briefly described.
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