The attachment of spores of a population of Pasteuria penetrans on juveniles of Meloidogyne incognita was significantly less at pH 3 than at greater pH. Similarly, attachment in acidic spore suspensions prepared directly from infested root systems and containing plant debris was less than in such suspensions that had been diluted even though the spore concentration was lower.
Gowen, S.R.; Ratnasoma, H.A. Spore attachment of Pasteuria penetrans on juveniles of Meloidogyne incognita as affected by pH and organic matter. Nematologia Mediterranea (1996) 24 (2) 283-285.