title: The effect of different initial densities of nematode (Meloidogyne javanica) on the build-up of Pasteuria penetrans population.
abstract: Pasteuria penetrans will build-up faster where there is a high initial nematode density and can suppress root-knot nematode populations in the roots of tomato plants. The effect of different initial densities of nematode (Meloidogyne javanica) (150, 750, 1500, 3000) and P. penetrans infected females (F1, F3) densities (F0=control and AC=absolute control without nematode or P. penetrans inoculum) on the build-up of Pasteuria population was investigated over four crop cycles. Two major points of interest were highlighted. First, that within a confined soil volume, densities of P. penetrans can increase >100 times within 2 or 3 crop cycles. Second, from a relatively small amount of spore inoculum, infection of the host is very high. There were more infected females in the higher P. penetrans doses. The root growth data confirms the greater number of females in the controls particularly at the higher inoculum densities in the third and fourth crops. P. penetrans generally caused the fresh root weights to be higher than those in the control. P. penetrans has shown greater reduction of egg masses per plant at most densities. The effects of different initial densities of M. javanica and P. penetrans on the development of the pest and parasite populations were monitored. And no attempt was made to return the P. penetrans spores to the pots after each crop so the build-up in actual numbers of infected females and spores under natural conditions may be underestimated.
authors.affiliation: Faculty of Crop Proctection, Sindh Agriculture University, Tandojam, Pakistan. d_darban@hotmail.com
authors.forename: Daim Ali
authors.initials: DA
authors.lastname: Darban
authors.forename: Mumtaz Ali
authors.initials: MA
authors.lastname: Pathan
authors.forename: Abdul Ghaffar
authors.initials: AG
authors.lastname: Bhatti
authors.forename: Sultan Ahmed
authors.initials: SA
authors.lastname: Maitelo
mesh_terms: D000818:Animals; D001407:Bacillus / Q000472:pathogenicity* / Q000502:physiology*; D018551:Solanum lycopersicum / Q000254:growth & development* / Q000469:parasitology*; D010572:Pest Control, Biological / Q000379:methods*; D014431:Tylenchoidea / Q000254:growth & development* / Q000382:microbiology*; D014930:Women