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Age Related Changes in the Chemical Oxygen Demand of Second Stage Juveniles of Meloidogyne Ja hAnica and Heterodera or Yzae

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The chemical oxygen demand (COD) of juveniles of increasing ages of Meloidogyne javanica and Heterodera oryzae was measured by oxidation with a hot solution of dichromate in sulphuric acid. In freshly hatched juveniles the COD equalled 35.3 nl O2/juvenile for M. javanica and 33.8 nl O1/juvenile for H. oryzae. The COD decreased more rapidly with age in M. javanica (-72.5% after 4 weeks) than in H. oryzae (-45 % after 5 weeks). Results are compared with data from respirometry and direct chemical determinations.

Affiliations: 1: Laboratoire de Nématologie, ORSTOM, B.P. 1386, Dakar, Sénégal


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