The implication of metabolic acids produced by Beauveria bassiana in pathogenesis of the migratory grasshopper, Melanoplus sanguinipes

1991 ◽  
Vol 58 (1) ◽  
pp. 106-117 ◽  
Author(s):  
Michael J. Bidochka ◽  
George G. Khachatourians
Keyword(s):  
Beauveria Bassiana ◽  
Melanoplus Sanguinipes

ISOLATION OF ASPERGILLUS PARASITICUS SPEARE AND BEAUVERIA BASSIANA (BALS.) VUILLEMIN FROM MELANOPLINE GRASSHOPPERS (ORTHOPTERA: ACRIDIDAE) AND DEMONSTRATION OF THEIR PATHOGENICITY IN MELANOPLUS SANGUINIPES (FABRICIUS)

1988 ◽  
Vol 120 (11) ◽  
pp. 989-991 ◽  
Author(s):  
K.C. Moore ◽  
M.A. Erlandson
Keyword(s):  
Beauveria Bassiana ◽  
Topical Application ◽  
High Mortality ◽  
Aspergillus Parasiticus ◽  
Post Inoculation ◽  
Melanoplus Sanguinipes

AbstractAspergillus parasiticus Speare and Beauveria bassiana (Bals.) Vuillemin were isolated from melanopline grasshoppers in Saskatchewan in 1986 and 1987. The pathogenicity of these isolates for Melanoplus sanguinipes (Fabricius) nymphs was assessed by topical, oral, and injected applications of 1.0 × 103, 104, or 105 conidia per individual. The A. parasiticus isolate was pathogenic to M. sanguinipes by injection and topical application but not orally. The B. bassiana isolate was pathogenic when injected or topically applied resulting in high mortality (82–100%), at all doses tested, between days 3 and 5 post-inoculation. Beauveria bassiana was infectious, at the highest dose tested, when orally applied with the majority of mortality occurring between 7 and 14 days post-inoculation.

SUSCEPTIBILITY OF THE MIGRATORY GRASSHOPPER, MELANOPLUS SANGUINIPES (FAB.) (ORTHOPTERA: ACRIDIDAE), TO BEAUVERIA BASSIANA (BALS.) VUILLEMIN (HYPHOMYCETE): INFLUENCE OF RELATIVE HUMIDITY

1987 ◽  
Vol 119 (10) ◽  
pp. 901-907 ◽  
Author(s):  
S. Marcandier ◽  
G.G. Khachatourians
Keyword(s):  
Relative Humidity ◽  
Beauveria Bassiana ◽  
Mycelial Growth ◽  
Field Testing ◽  
Natural Mortality ◽  
Melanoplus Sanguinipes ◽  
Body Coloration ◽  
Daily Rate ◽  
Significant Difference ◽  
Semi Arid

AbstractIn laboratory tests, Melanoplus sanguinipes (Fab.) was susceptible to infection by Beauveria bassiana (Bals.) Vuillemin conidia. Infection occurred independently of the relative humidity (RH) (12, 33, 76, 100% RH). No significant difference was observed in the final percentage mortality of the treated grasshoppers and in the lethal times (LT50)(P > 0.05) under the RH conditions studied. However, the daily rate of mortality after treatment was higher at 76% RH than at 33% RH. High natural mortality occurred at 100% RH.At 100% RH, treatment with B. bassiana was associated with an outgrowth of microorganism that created septicemic conditions in the absence of the characteristic symptoms of mycosis. Below 100% RH, mycelial growth on cadavers was never observed, even though partial or total insect mummification occurred, and a pink body coloration on approximately 80% of the insects indicated Beauveria as the killing agent. Once transferred to 100% RH, no more than 5% of the treated grasshoppers exhibited external mycelial growth.The microenvironment at the cuticular level of the grasshopper allows expression of conidial pathogenicity regardless of ambient RH. Hence, together, these observations suggest the feasibility of field testing with B. bassiana as a bioinsecticide against M. sanguinipes in semi-arid climatic areas.

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