Entomopathogenic fungi against the red palm weevil: Lab and field evidence

Sabbahi, Rachid; Hock, Virginia

doi:10.1016/j.cropro.2023.106566

Cited by 4 publications

(7 citation statements)

References 114 publications

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“…According to [ 48 ] the species of entomopathogenic fungi with the greatest potential to be developed as bioinsecticides are those that are cosmopolitan and found in the environment in which the microorganism will be applied. The authors of [ 49 , 50 ] have shown that native microbial agents can be used in biological control programs for Rhynchophorus spp. populations.…”

Section: Resultsmentioning

confidence: 99%

“…For the authors of [ 50 ], entomopathogenic fungi, such as B. bassiana , Metarhizium anisopliae , Isaria fumosorosea , and Lecanicillium lecanii , are a promising alternative for the management of R. ferrugineus infestations when used with other control methods, such as pheromone traps, insecticides, and sanitation, significantly reducing RPW populations and damage.…”

Section: Resultsmentioning

confidence: 99%

“…Meanwhile, the exotic species of entomopathogenic fungi used in biocontrol may be ineffective in some pests due to their adaptation to climatic diversity and host-related isolate differences; however, the identification of native EF is considered a promising alternative due to their ecological suitability to native pest species and the lower non-target organisms’ susceptibility when compared with exotic isolates [ 49 , 50 ].…”

Section: Resultsmentioning

confidence: 99%

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Native Entomopathogenic Fungi Isolated from Rhynchophorus palmarum (Linnaeus, 1758) in Northeast Brazil

Dalbon,

Acevedo,

Ribeiro Junior

et al. 2024

Insects

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Both palm weevils, the South American (Rhynchophorus palmarum) (SAPW) and the red palm weevil (R. ferrugineus, RPW), are present in South America, affecting commercial, ornamental, and native palms. These pests oviposit and thrive on selected Arecaceae. R. palmarum mainly infests coconut (Cocos nucifera), oil palms (Elaeis guineensis), and other ornamental and native palms in America, causing a significant social impact on growers. The weevils fulfill a significant ectosymbiotic macro- and microorganism role in the first period of larval development, worsening the damage which, during this period, is not yet apparent. Palm protection in the Brazilian context suggests the use of indigenous agents for microbiological biocontrol. This research identifies three Brazilian Beauveria bassiana isolates: CVAD01, CVAD02, and CVAD06. The results suggest that the strain’s impact on R. palmarum can also be compared with that of the commercial strain Beauveria bassiana. Phylogenetic analysis allowed the delimitation of species of Beauveria (Hypocreales). Pathogenicity tests caused significant mortality in R. palmarum. The isolates CVAD01, CVAD02, and CVADO6 showed high pathogenicity between 7 and 21 days, with mortality rates between 90 and 100%, suggesting that they may be effective biological control agents of R. palmarum in the field when used, within available means, to mitigate the impact of R. palmarum and R. ferrugineus in South America.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Native Entomopathogenic Fungi Isolated from Rhynchophorus palmarum (Linnaeus, 1758) in Northeast Brazil

Dalbon,

Acevedo,

Ribeiro Junior

et al. 2024

Insects

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“…Present management approaches against R. ferrugineus involve various control methods such as cultural techniques including burning of dead tree trunks to destroy immature stages inside, cutting down the infected palms, fertilization and irrigation, mass trapping, as well as monitoring, early detection, applications of acoustic devices, male sterile techniques, host plant resistance, entomopathogenic nematodes, insecticide applications, including fumigation, or application of natural substances [14][15][16][17][18][19][20]. Due to the high cost of pheromone traps and the prevalence of hot summers in date-producing areas, the trap strategy has not attained wide acceptance against R. ferrugineus [21].…”

Section: Introductionmentioning

confidence: 99%

“…Unlike other microbial agents (viruses, protozoa and bacteria) which need to be ingested by the host insect for the initiation of the infection process [29], fungal pathogens can directly penetrate the insect host's cuticle [30]. Entomopathogenic fungi should be considered for inclusion in IPM programs for R. ferrugineus [20,[31][32][33]. EPF can affect survival and reproduction of RPW [12,34].…”

Section: Introductionmentioning

confidence: 99%

Efficacy and Persistence of Entomopathogenic Fungi against Rhynchophorus ferrugineus on Date Palm: Host to Host Transmission

Alwaneen,

Wakil,

Kavallieratos

et al. 2024

Agronomy

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The red palm weevil (RPW), Rhynchophorus ferrugineus (Olivier) (Coleoptera: Dryophthoridae), is a destructive and voracious pest of palm species worldwide. Due to environmental and regulatory concerns, ecologically safe alternatives to synthetic chemical insecticides are needed to manage this cryptic insect species. Entomopathogenic fungi have the potential to manage this pest. The scope of management and effectiveness can be improved by direct control or horizontal transmission of entomopathogenic fungal isolates. We tested in the laboratory the virulence and pathogenicity of fifteen different entomopathogenic fungal isolates belonging to the following species: Beauveria bassiana, Metarhizium anisopliae, Beauveria brongniartii and Purpureocillium lilacinum. All fungal isolates were found virulent against larvae (14.9 ± 1.06 to 81.5 ± 1.48% mortality) and adults (5.6 ± 1.12 to 51.7 ± 1.51% mortality) at 12 d post-treatment. From a screening bioassay, five M. anisopliae (WG-08, WG-09) and B. bassiana (WG-23, WG-24, WG-25) isolates were tested for their concentration response mortality against larvae and adults after 7, 14 and 21 days (d) of treatment. Mortality was found positively correlated with concentration and time. At 21 d of treatment, WG-23 and WG-25 1 × 108 conidia/mL resulted in 100% mortality against larvae while only WG-25 1 × 109 conidia/mL caused 100% mortality of adults. Along with mortality, all the potential isolates have strong ovicidal effects that reduced 81.49% at 1 × 108 conidia/mL. The horizontal transmission bioassay indicated that the infected adults transmitted the disease to healthy individuals. Horizontal transmission of fungi from infected to non-infected adults not only caused significant mortality but also had a serious sublethal impact on insect development and fitness including reduced number of eggs/d fecundity, egg viability and neonate survival. Isolate WG-25 reduced oviposition (0.5 eggs/d), fecundity (11.7 eggs/female), egg viability (11.6%) along with larval survival 25.9% when infected male mated with normal female. In semi-field trials, all fungal isolates reduced survival of larvae found inside the palms and ultimately reduced infestations over a period of two months. The results of this study indicate that entomopathogenic fungi should be further tested for sustainable and efficient control of RPW in date palm production systems.

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