A Laboratory Study on the Efficacy of Metarhizium anisopliae (Metsch.) Sorokin and Beauveria bassiana (Bals.) Vuill Against Spodoptera exigua (Hb.) (Lepidoptera: Noctuidae)

Abstract

The efficiency of the entomopathogenic fungi, Metarhizium anisopliae (Metsch.) Sorokin and Beauveria bassiana (Bals.) Vuill against 2 nd instar larvae of Spodoptera exigua (Hb.) was investigated under laboratory conditions of 27º ±1ºC and 65% ±10 % R.H. Both of the tested entomopathogenic fungi proved to be effective on larvae of S. exigua, the mortality percentage increasing with increase in spore concentration. Results revealed marked changes in the duration of the larval and pupal stages and in the different biological aspects in general. There was a decrease in percentage of pupation and adult emergence in addition to appearance of deformities.

Effect of the fungus, Beauveria bassiana (Balsamo) Vuillemin, on the beet armyworm, Spodoptera exigua (Hübner) larvae (Lepidoptera: Noctuidae), under laboratory and open field conditions

“…The calculated LC 50 for L 3 and L 4 was 18,463 (slope 0.414) and 35,990 (slope 0.387) spores/ml, while the LC 90 was 37, 806 (slope 0.345) and 74,391 (slope 0.387) for the two larval instars, respectively. These results are in line with those of El-Husseini et al (2008) and El-Banna et al (2014).…”