Pathogenicity of some local entomopathogenic fungus isolates on the cotton leafworm larvae, Spodoptera littoralis (Boisd.) (Lepidoptera: Noctuidae)

Abstract

Background Pathogenicity of the entomopathogenic fungi (EPF), isolated from soil samples collected from Ordu Province, Turkey, was evaluated on the second-instar larvae of the cotton leaf worm Spodoptera littoralis (Boisd.) (Lepidoptera: Noctuidae) under laboratory conditions. Results Firstly, single-concentration response tests were conducted in order to determine the efficacy of the 64 isolates on S. littoralis larvae at the concentration of 1 × 108 conidia/ml. The five isolates displaying the highest mortality rates in single-concentration response tests, ORU-50, ORM-40, ORP-13, ORP-27 and ORM-48 (which included Beauveria bassiana, Metarhizium brunneum and Clonostachys rogersoniana), were subjected to concentration–response tests at the concentrations of 1 × 105–1 × 109 conidia/ml. The lowest LC50 and LC90 values were recorded at ORP-27 with 1.68 × 107 and 4.60 × 108 conidia/ml, respectively, followed by ORP-13 and ORM-40. Conclusions Accordingly, it was found that M. brunneum isolates were more effective than B. bassiana and C. rogersoniana against S. littoralis larvae. ORP-27, ORP-13 and ORM-40 of M. brunneum isolates can be a potential biological control agent used against S. littoralis larvae.

Efficacy of Two Entomopathogenic Fungi in Combination with Diatomaceous Earth Against Spodoptera littoralis (Boisd.) (Lepidoptera: Noctuidae)

“…Our results were in agreement with El Husseini (2019), who tested the local isolate of the entomopathogenic fungus M. anisopliae against 3 rd and 5 th larval instars of the cotton leafworm S. littoralis and recorded the deaths of larvae that reached high mortality four days after treatment. Şahin and Yanar (2021) observed a high mortality rate of M. anisopliae when applied to S. littoralis larvae under laboratory conditions.…”

Identification of Clonostachys rogersoniana as a causal agent of sisal leaf blight disease in South China

“…However, C. rogersoniana is primarily associated with the synthesis of bioactive metabolites for treating human diseases (Chanthasena et al, 2021; De Oliveira et al, 2022; Tapfuma et al, 2022; Yin et al, 2017). It is also used in the biological control of fungal diseases, nematode infestations (Pecundo et al, 2021; Zhao et al, 2021) and pathogenic entomopathogenic fungi associated with some agricultural pests (Sahin & Yanar, 2021; Sonmez et al, 2016). However, plant–host diseases caused by C. rogersoniana have yet to be reported.…”

Biodiversity and virulence characterization of entomopathogenic fungi isolated from soils in different regions of Nigeria

“…This finding agreed with the results of Erler and Ates (2015) who reported that larval mortality varies with the conidia concentration and time after application. Similarly, using single conidial concentration mortality of Spodoptera littoralis differed among Beauveria bassiana, Metarhizium brunneum and Clonostachys rogersoniana (Şahin and Yanar 2021).…”