Field persistence and pathogenicity of <i>Cordyceps fumosorosea</i> for management of <i>Diaphorina citri</i>

Pick, David A.; Avery, Pasco B.; Qureshi, Jawwad A.; Arthurs, Steven; Powell, Charles A.

doi:10.1080/09583157.2021.1976727

Cited by 3 publications

(1 citation statement)

References 41 publications

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“…This was probably because it took longer for fungal propagules to be effective under low temperatures, or spores became dormant for a period of time and resumed activities when conditions were favorable, or the fungus propagated on hosts to reach a higher level to cause infection. Pick et al [ 30 ] found that the number of CFUs of C. javanica Apopka97 ( I. fumosorosea of PFR-97™) declined at 7 days post-treatment compared with 0-day in weekly samples of field-caged citrus leaves but increased after 35 days, and there was a residue effect in causing mortality (up to 40%) of the Asian citrus psyllid, Diaphorina citri Kuwayama, over a 35-day experimental period. Conversely, Avery et al [ 31 ] reported that in the field assessment of PFR-97™ against the invasive ficus whitefly, Singhiella simplex (Singh), the CFU number increased from day 1 to day 7 post-treatment and then declined.…”

Section: Discussionmentioning

confidence: 99%

Post-Application Field Persistence and Efficacy of Cordyceps javanica against Bemisia tabaci

Toews

Behle

et al. 2023

JoF

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Previously, Cordyceps javanica Wf GA17, a causing agent of whitefly epizootics in southern Georgia, demonstrated superior temperature tolerance and higher virulence against the whitefly Bemisia tabaci than commercial strains in the laboratory. The post-application persistence and efficacy of this fungus against B. tabaci were compared with that of the commercially available C. javanica Apopka97 strain over a two-year field study in cotton and vegetable crops. When blastospores of both strains were applied alone, whitefly populations were not effectively suppressed. Thus, JMS stylet oil was added to fungal treatments for enhancing efficacy and persistence. For 0-day samples, all fungal treatments caused similar but significant levels of immature mortality regardless of fungal strain, propagule form (conidia vs. blastospores), and application method (alone or mixed with JMS). In follow-up samplings, Wf GA17 blastospores + JMS achieved higher control levels than other treatments in some trials, but the efficacy did not last long. The JMS oil alone caused significant mortality and suppressed whiteflies. Over 90% of spores lost viability 24 h after treatment in all fungal treatments. Across evaluation times, there was no difference between the two fungal strains (conidia or blastospores, alone or combined with JMS), but conidia persisted better than blastospores for both strains. Overall, the field persistence and efficacy of C. javanica did not last long; therefore, improved delivery methods and formulations are needed for enhancement.

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Section: Discussionmentioning

confidence: 99%

Post-Application Field Persistence and Efficacy of Cordyceps javanica against Bemisia tabaci

Toews

Behle

et al. 2023

JoF

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Insecticides for corn leafhopper management versus entomopathogenic fungal isolates: In vitro compatibility, physical-chemical interactions, and on-farm assessments

Prado Ribeiro,

Telles Amandio,

Rakes

et al. 2023

Crop Protection

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Pathogenicity of Cordyceps javanica (Hypocreales: Cordycipitaceae) to Diaphorina citri (Hemiptera: Liviidae) Adults, with Ultrastructural Observations on the Fungal Infection Process

et al. 2021

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Entomopathogenic fungi are proposed biological control agents against the Asian citrus psyllid (Diaphorina citri). We quantified the pathogenicity of Cordyceps javanica strain Apopka 97 strain (Cja Apopka 97) (blastospores and conidia) against D. citri using the spray technique. We also used light and scanning electron microscopy to observe the Cja Apopka 97, infection process against D. citri adults at different stages pre- and post-mortem. Our findings demonstrated that psyllid mortality in the blastospore treatment ranged from 8 to 25% within 24–48 h of exposure, compared to 0% in the conidial and control treatments. However, psyllid mortality rate had reached 100% by 7 days after exposure at a concentration of 107 spores/mL, under both fungal treatments compared to the controls (0%). SEM and light microscopy revealed several stages in in the Cja Apopka 97 infection process of D. citri, including spore adherence and germ tube formation within 24 h post-inoculation, penetration pegs and mycelia growth on wings after 72 h, rupturing of cuticle after 96 h and mycelial mass colonizing host body after 144 h. Our study findings provide basic information on the interaction of entomopathogenic fungi with D. citri which will assist in the understanding of the infection process and the potential roles of entomopathogenic fungi in its management.

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Field persistence and pathogenicity of Cordyceps fumosorosea for management of Diaphorina citri

Cited by 3 publications

References 41 publications

Post-Application Field Persistence and Efficacy of Cordyceps javanica against Bemisia tabaci

Post-Application Field Persistence and Efficacy of Cordyceps javanica against Bemisia tabaci

Insecticides for corn leafhopper management versus entomopathogenic fungal isolates: In vitro compatibility, physical-chemical interactions, and on-farm assessments

Pathogenicity of Cordyceps javanica (Hypocreales: Cordycipitaceae) to Diaphorina citri (Hemiptera: Liviidae) Adults, with Ultrastructural Observations on the Fungal Infection Process

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