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The effect of different initial densities of nematode (Meloidogyne javanica) on the build-up of Pasteuria penetrans population

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2005年第2期6卷 113-118页

作者： DARBAN Daim ali pathan mumtaz ali BHATTI Abdul Ghaffar MAITELO Sultan Ahmed Faculty of Crop Proctection Faculty of Crop ProctectionFaculty of Crop ProctectionFaculty of Crop Proctection Sindh Agriculture University Tandojam Pakistan Sindh Agriculture University Tandojam Pakistan Sindh Agriculture University Tandojam Pakistan Sindh Agriculture University Tandojam Pakistan

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 *** 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.

关键词：线虫密度番茄虫害 Pasteuria penetrans 孢子

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