Abstract
The susceptibility of 1st to 4th instars of Bemisia tabaci (Gennadius, 1989) (Hemiptera: Aleyrodidae) to three isolates of Cordyceps sp. (Hypocreales: Cordycipitaceae) was evaluated in screenhouse experiments under variable temperatures and moisture conditions. No differences in susceptibility to the Cordyceps sp. isolates were observed among 1st, 2nd, and 3rd instar nymphs with respect to median lethal time (LT50) values. Confirmed mortalities ranged from 63.7 to 87.8% when the isolates were tested at 5 × 107 conidia mL−1. The 4th instar was the least susceptible to the fungal isolates (≤ 36.6% mortality). However, 60.0 to 99.5% of the adults that emerged from 4th instar nymphs previously treated with the fungus succumbed to the infection. Temperature was more detrimental to Cordyceps sp. virulence towards B. tabaci nymphs than relative humidity (RH). At similar RH, median LT50 for 1st instar (9.4 days) was higher than for 3rd instar (5.3 days) when the fungus was tested at 5 × 107 conidia mL−1; minimal temperatures of ≥ 12.6°C compared to ≥ 17.0°C were registered for experiments with 1st and 3rd instars, respectively. However, temperatures ≥ 35°C for 4 to 6 h daily did not affect the efficacy of the fungus against nymphs. Cordyceps sp. showed high virulence to all life stages of B. tabaci at relatively low RH, and an ability to grow extensively over the leaf surface and to produce high amounts of conidia on infected hosts. These attributes certainly boost its potential as an important pest control component of B. tabaci biotype B, especially for management of populations resistant to synthetic insecticides.
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Acknowledgments
The authors thank Edmar Cardoso de Moura (in memoriam) and Edson Djalma for technical support. We also thank Ana Lúcia Delilabera Faria for assistance with the cited references.
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This work was possible through financial support from Lallemand grant no. 0978009 and Embrapa grant no. 021107005, and to the National Council for Scientific and Technological Development (CNPq) for support with the scholarship for the first author no. 132678/2017-9.
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HB and EQ designed the studies. HB and ES performed the bioassays. HB and JFS analyzed the data. HB, EQ and RH wrote the manuscript. All authors reviewed and approved the manuscript before submission.
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Boaventura, H.A., Quintela, E.D., Santos, E.N. et al. Susceptibility of All Nymphal Stages of Bemisia tabaci Biotype B (Hemiptera: Aleyrodidae) to Three Brazilian Isolates of Cordyceps sp. (Hypocreales: Cordycipitaceae) in a Screenhouse Under Variable Temperature and Moisture Conditions. Neotrop Entomol 50, 100–113 (2021). https://doi.org/10.1007/s13744-020-00823-5
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DOI: https://doi.org/10.1007/s13744-020-00823-5