
	Journal of Entomology
	Year: 2010 \| Volume: 7 \| Issue: 1 \| Page No.: 19-32 DOI: 10.3923/je.2010.19.32

Pathogenicity of Beauveria bassiana against the Tiger Moth, Atteva sciodoxa (Lepidoptera: Yponomeutidae)

F. Abood, G.A. Bajwa, Y.B. Ibrahim and A.S. Sajap

Abstract: Seven isolates of Beauveria bassiana were screened for pathogenicity and infectivity at a concentration of 5x10⁷ conidia mL^-1 against Atteva sciodoxa at 27±2°C and 75±5% relative humidity with 12 h photoperiod. Based on screening results, isolates Bba-Pp and FS-11 were further bioassayed at 1x10⁶, 5x10⁶ and 1x10⁷ conidia mL^-1. All the isolates were found to be pathogenic. However, the infectivity varied significantly among the isolates. The earliest mortality was recorded three days after inoculation. The most virulent isolate, Bba-Pp, caused 100% mortality with a median infective time (ET₅₀) of 3.6 days on day seven following inoculation while FS-11 caused 83.3% mortality with an ET₅₀ value of 4.1 days. Bba-Sl3 was the least infective isolate with 24.9% mortality and 15.3 days of median effective time. Mycelia appeared on 24 to 48 h old cadavers. The highest level of sporulation on two-week old cadavers was 150.6x10⁵ Bba-Pp conidia mg^-1 cadaver while the lowest was 12.23x10⁵ Bba-Sl3 conidia. The median effective concentration (EC₅₀) of Bba-Pp was 9.89x10⁵ conidia mL^-1 while that of FS-11 was 3.85x10⁶ conidia mL^-1. The ET₅₀ values for 1x10⁶ and 1x10⁷ conidia mL^-1 of Bba-Pp ranged between 7.0 and 4.4 days, respectively, while that of FS-11 were 10.3 and 5.8 days. A strong negative correlation was found between inoculum concentrations and food consumption (R² = -0.99). The infection by Bba-Pp and FS-11 resulted in 55.8 to 72.5% reduction in food consumption by A. sciodoxa compared to the controls.

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How to cite this article:

F. Abood, G.A. Bajwa, Y.B. Ibrahim and A.S. Sajap, 2010. Pathogenicity of Beauveria bassiana against the Tiger Moth, Atteva sciodoxa (Lepidoptera: Yponomeutidae). Journal of Entomology, 7: 19-32.

DOI: 10.3923/je.2010.19.32

URL: https://scialert.net/abstract/?doi=je.2010.19.32

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