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Paper Information

Journal:   APPLIED ENTOMOLOGY AND PHYTOPATHOLOGY   September 2003 , Volume 71 , Number 1; Page(s) 123 To 138.
 
Paper: 

EFFECT OF TEMPERATURE ON GERMINATION, MYCELIAL RADIAL GROWTH AND VIRULENCE OF BEAUVERIA BASSIANA (BALS.) VUILL. (DENT.: MONILIACEAE) ON CHILO SUPPRESSALIS WALKER (LEP.: PYRALIDAE)

 
 
Author(s):  MAJIDI SHILSAR F., KAMALI K., ALI NIA F., ERSHAD J.
 
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Abstract: 

Effect of temperature on germination, radial growth and virulence of six isolates of Beauveria bassiana (Mcb1, Mcb6, Mcb8, Mcb11, Mcb12, Mcb18) on striped stem borer, Chilo suppressalis, was studied in the laboratory. About 2400 dead larvae were collected during this study. Six fungal isolates were purified and then germination, radial growth and virulence of the isolates were studied by exposing them to temperatures ranging from 3 to 38°C. Germination, vegetation growth and virulence for all isolates observed at 10°C. Optimum temperature for germination, radial growth and pathogenic activity ranged from 20 to 30°C. Germination of conidia for all isolates was low at 5, 10, 15, 35 and 38°C. There was no significant difference in germination between isolates Mcbl and Mcbl8 at 5 to 35°C. Mycelial growth was observed at all temperatures except 3 and 38°C. The lowest mycellium growth was occurred for all tested isolates at temperatures 5, 10, 35 and 38°C. Comparison of daily radial growth rates day-1 showed that Mcbl, Mcbl l and Mcbl8 were superior to other isolates at 20, 25 and 30°C.Singnificant differences were found in mortality for isolates Mcbl, Mcb6 and Mcb18 at 10-30°C. Pathogenic activity of these isolates were high. Mcb18 had the lowest LT50 value (5.35 days) at 25°C. Mcbl and Mcb18 showed pathogenic activity against striped rice stem borer, in a broad temperature range.

 
Keyword(s): BEAUVERIA BASSIANA, TEMPERATURE, VIRULENCE, GERMINATION, MYCELIAL RADIAL GROWTH, MORTALITY, RICE, CHILO SUPPRESSALIS
 
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