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COMPARATIVE PATHOGENICITY OF NOSEMA ACRIDOPHAGUS HENRY AND NOSEMA CUNEATUM HENRY (MICROSPORIA: NOSEMATIDAE) FOR MELANOPLUS SANGUINIPES (FAB.) (ORTHOPTERA: ACRIDIDAE)1

  • M.A. Erlandson (a1), M.K. Mukerji (a1), Al B. Ewen (a1) and C. Gillott (a1)

Abstract

Nosema acridophagus Henry was shown to be more virulent than N. cuneatum Henry to 3rd-instar nymphs of Melanoplus sanguinipes (Fab.) following peroral inoculation with 1.0 × 106, 105, 104, or 103 spores/individual. The lethal time was dose dependent and significantly shorter and the lethal dose (LD50) was significantly lower in grasshoppers inoculated with N. acridophagus than for those inoculated with N. cuneatum. Grasshoppers inoculated with N. acridophagus died earlier and a smaller proportion survived to the adult stage compared with those inoculated with N. cuneatum. Nosema acridophagus was more infectious at the lower doses than was N. cuneatum; however, N. cuneatum reached an intensity of infection in host tissues which was 2–10 times higher. Both microsporidians appeared to have similar pathogenicity for both individually and group-reared M. sanguinipes.

Nosema acridophagus Henry s'avère plus virulent que N. cuneatum Henry pour les nymphes de troisième stade de Melanoplus sanguinipes (Fab.) après inoculation pérorale avec 1,0 × 106, 105, 104 ou 103 spores/individu. Le temps léthal dépend de la dose et est significativement plus bref, et la dose léthale (DL50) est significativement plus faible pour les criquets inoculés avec N. acridophagus que pour ceux inoculés avec N. cuneatum. Les criquets inoculés avec N. acridophagus meurent plus tôt et une plus faible porportion survit jusqu'au stade adulte que ceux inoculés avec N. cuneatum. Nosema acridophagus s'avère plus infectieux aux faibles doses que N. cuneatum, mais celui-ci atteint une infectiosité dans les tissus de l'hôte 2 à 10 fois supérieure. Les microsporidies des deux espèces semblent avoir la même pathogénicité pour M. sanguinipes élevé individuellement ou en groupe.

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COMPARATIVE PATHOGENICITY OF NOSEMA ACRIDOPHAGUS HENRY AND NOSEMA CUNEATUM HENRY (MICROSPORIA: NOSEMATIDAE) FOR MELANOPLUS SANGUINIPES (FAB.) (ORTHOPTERA: ACRIDIDAE)1

  • M.A. Erlandson (a1), M.K. Mukerji (a1), Al B. Ewen (a1) and C. Gillott (a1)

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