Mortality and maize leaf consumption of Chilo partellus (Lepidoptera: Pyralidae) larvae treated with Beauveria bassiana and Metarhizium anisopliae
Titel:
Mortality and maize leaf consumption of Chilo partellus (Lepidoptera: Pyralidae) larvae treated with Beauveria bassiana and Metarhizium anisopliae
Auteur:
Tefera, Tadele Pringle, KL
Verschenen in:
International journal of pest management
Paginering:
Jaargang 50 (2004) nr. 1 pagina's 29-34
Jaar:
2004-01
Inhoud:
Second and third instar Chilo partellus larvae were treated with Beauveria bassiana and Metarhizium anisopliae and measurements made of mortality and daily consumption of maize leaf. At the concentration of 1 × 108 conidia/ml, 100% mortality of second and third instar larvae was observed 6 and 15 days after treatment, respectively. Infection by the fungi was associated with a reduction in mean daily food consumption. Four concentrations of the fungi, 1 × 108, 1 × 107, 1 × 106 and 1 × 105 conidia/ml, were tested against second instar larvae. The higher concentrations, 1 × 108 and 1 × 107 conidia/ml, resulted in greater reduction in food consumption as compared to the lower concentrations (1 × 106 and 1 × 105 conidia/ml). Reduction in food consumption of C. partellus larvae treated with B. bassiana and M. anisopliae may offset the slow speed of kill of the fungi. In a glasshouse trial, spraying a conidial suspension (2 × 108 conidia/ml) of the fungi resulted in significant reduction in leaf damage caused by second instar larvae.
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