Pathogenicity Of Entomopathogenic Fungi Isolates on Immature Stages Of Pectinophora Gossypiella (Saunders), (Lepidoptera: Gelechiidae)

Abstract

The pink bollworm, Pectinophora gossypiella, (Saunders) (Lepidoptera: Gelechiidae) considers as one of the world's most invasive insects, is a voracious lepidopteran pest of cotton. To control this insect pest and increase crop yield, chemical pesticides was mainly used and that caused resistant population and side effects for human and environment. Therefore, there is a need to increase of alternative methods such as the biological control. During the current study, five fungi isolates, one of Beauveria bassiana (AUMC 9896) and four of Metarhizium anisopliae (M1, M2, M3 &M4) were evaluated against the eggs, new hatched larvae, and pupa of P. gossypiella under laboratory conditions. Bioassay was performed using spores suspension concentrations (1.0 × 10 6 , 1.0× 10 7 and 1.0×10 8 spores /ml). Results showed that B. bassiana (AUMC 9896) proved to be more toxicity than M. anisopliae isolates as depicted by the calculated LC50 values on all treated stages, egg, larva, and pupa. On the other hand, the highest egg and pupal mortality percentages were recorded to B. bassiana (76.7 and 80.0%), respectively, at the same concentration (1×10 8 spores /ml). Whereas the isolate M. anisopliae (M4) showed the least one (23.3 and 46.6 %). Also, M. anisopliae isolates (M1 & M4) had recorded the highest value of larval mortality (86.7%). Thus, it can be concluded that the isolates B. bassiana (AUMC 9896 and M1) were strong pathogenicity while the isolates (M3&M4) were moderate and (M2) was showed low pathogenicity.

Intraguild interaction between the entomopathogenic fungus Beauveria bassiana and two aphid predators

“…The introduction of biocontrol agents, such as entomopathogenic fungi (EPF) and predators, has been driven by the findings of researchers aiming to achieve sustainable agricultural management. All that lead the researchers to introduce biocontrol agents such as entomopathogenic fungi (EPF) and predators for sustainable agricultural management (Lacey et al, 2015;Awad et al, 2022;Nouh et al, 2022;Ashraf al et., 2024). Fungal biocontrol agents possess a distinct method of infection that sets them apart from viruses and bacteria which rely on ingestion, while fungi directly invade their hosts through the cuticle.…”