Efficacy of some Entomopathogenic Fungal Extracts and their Chemical Constituents as Alternative Bio-Pesticides against Onion Thrips, Thrips tabaci L.

Abstract

Three entomopathogenic fungal secondary metabolites of Metarhizium anisopliae, Paceliomyces fumosoroseus and Trichoderma longibrachiatum were extracted using two different organic solvent and thoroughly investigated as bio-insecticide against nymphs and adults of onion thrips, Thrips tabaci using spraying method technique. The toxicity index of LC 50 values revealed that T. longibrachiatuom secondary metabolites extracts (chloroform and ethyl acetate) were the most effective against the two developmental stages (nymph stage and adult) of T. tabaci followed by M. anisopliae extracts and the least toxic one P. fuosoroseus extracts after 7days of treatment. The chemical composition of the most promising extracts in each entomopathogenic fungi were analyzed using GC-MS technique. Thirty-five compounds belonging to six different classes of natural products were characterized.

Side Effect of Indigenous Entomopathogenic Fungi on the Predatory Mite, Cydnoseius negevi (Swirski and Amitai) (Acari: Phytoseiidae)

“…These findings agree with those obtained by Sanjaya et al (2016) and Dogan, et al (2017) who noted that some predatory mite species have a kind of immunity which prevent conidia or hyphae from penetration mite bodies. Recently, many researchers proved that most entomopathogenic fungi can produce secondary metabolites, which may have an antioxidant role that accumulated lethal lipids in pest body, (Saad et al, 2019). In other word, these metabolites may have insecticidal activities such as C. cladosporides, M. anisopliae, B. bassiana and P. fumosoroseus extracts.…”