Entomophaga (1994) 39, 351-361
M. Welling, G. Nachtigall and G. Zimmermann (1994)
Metarhizium spp. isolates from Madagascar: Morphology and effect of high temperature on growth and infectivity to the migratory locust, Locusta migratoria
Entomophaga 39 (3-4), 351-361
Abstract: Five strains of Metarhizium anisopliae (Metsch.) Sorokin and one strain of Metarhizium flavoviride Gams and Rozsypal originally isolated in Madagascar were studied. Measurements of conidia and, for the first time, also of blastospores produced in a liquid medium were used for species and variety determination. Blastospores of M. flavoviride were more homogenous in their size than those of M. anisopliae. Growth at high temperatures between 25 degree and 40 degree C showed that 4 isolates of M. anisopliae grew at 36 degree C and M. flavoviride grew at 38 degree C. Using alternating day/night temperatures (8/16 h) the three strains tested could also tolerate 40 degree /25 degree C. In bioassays, five Metarhizium spp. isolates were tested against third and fourth instar larvae of Locusta migratoria (L.) at two alternating day/night temperatures of 30 degree /25 degree C and 36 degree /25 degree C. In the cooler regime, all strains caused a mortality of 50% within 5.9 to 8.5 days (median lethal time), while in the 36 degree /25 degree C treatment only the thermophilic M. flavoviride and one M. anisopliae strain isolated from a soil sample gave comparable results with median lethal times of 6.8 and 7.3 days, respectively.
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Link to article at publishers website
Database assignments for author(s): Gisbert Zimmermann
Research topic(s) for pests/diseases/weeds:
biocontrol - natural enemies
Research topic(s) for beneficials or antagonists:
evaluation - screening - selection
Pest and/or beneficial records:
| Beneficial | Pest/Disease/Weed | Crop/Product | Country | Quarant.
|
|---|---|---|---|---|
| Locusta migratoria | Madagascar | |||
| Metarhizium acridum (entomopathogen) | Locusta migratoria | Madagascar |
