Infection of Blissus antillus (Hemiptera: Lygaeidae) Eggs by the Entomopathogenic Fungi Metarhizium anisopliae and Beauveria bassiana |
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Authors: | R. I. Samuels D. L. A. Coracini C. A. Martins dos Santos C. A. T. Gava |
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Affiliation: | Laboratory of Plant Protection, Universidade Estadual do Norte Fluminense, 28015-620, Campos dos Goytacazes, RJ, Brazil |
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Abstract: | This study determined the pathogenicity and virulence of Beauveria bassiana and Metarhizium anisopliae to eggs of the chinch bug Blissus antillus (Hemiptera: Lygaeidae). Eggs were inoculated under laboratory conditions by immersion in concentrations of 1 × 104 and 5 × 106 conidia/ml. Inoculated eggs were kept under controlled conditions. Evaluations were carried out daily for 20 days. M. anisopliae isolates were highly virulent to eggs, even at 1 × 104 conidia/ml. All B. bassiana isolates tested were considered to be of low virulence or avirulent. The most virulent isolate tested was ESALQ 818 (M. anisopliae), which caused 96.7% infection, when eggs were immersed in suspensions of 1 × 104 conidia/ml. Conidial production on infected eggs was observed to be highest for M. anisopliae isolate CG144, with a mean value of 11.6 × 105 conidia/ml/egg. Infection of Blissus eggs oviposited on plant stems was greater when M. anisopliae isolate CG144 was formulated in mineral oil (63.5% mortality) than when formulated in Tween 80 (27.1% mortality). |
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Keywords: | Metarhizium anisopliae Beauveria bassiana Blissus antillus chinch bug Brachiaria arrecta biological control entomopathogenic fungus |
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