Donald W. Roberts
Ph.D., University of California, Berkeley 1964
Department of Biology
Logan, UT 84322-5305
Insect pathology and microbial control of insect pests, including sustainable pest control in developing nations. Entomopathogenic fungi -- from field applications to molecular biology: including the effects of stress (heat, solar UV radiation) on fungal spores and world-wide searches for new isolates of insect pathogenic fungi. Recent field applications have emphasized grasshopper and cricket pests.
Rangel, D.E.N., E.K.K. Fernandes, A.J. Anderson, and D.W. Roberts. 2012. Culture of Metarhizium robertsiion salicylic-acid supplemented medium induces increased conidial thermotolerance, Fungal Biology. In press
Kim, J. J. and D. W. Roberts. 2012. The relationship between conidial dose, moulting and insect developmental stage on the susceptibility of cotton aphid, Aphis gossypii, to conidia of Lecanicillium attenuatum, an entomopathogenic fungus. Biocontrol Science and Technology. In press.
Fernandes, E.K.K., R.E.P. Bittencourt, and D.W. Roberts. 2012. Perspectives on the potential of entomopathogenic fungi in biological control of ticks. Experimental Parasitology. In press.
Fernandes, E.K.K., I.C. Angelo, D.E.N. Rangel, T.C. Bahiense, A.M.L. Moraes, D.W. Roberts and V. R.E.P. Bittencourt. 2011. An intensive search for promising fungal biological control agents of ticks, particularly Rhipicephalus microplus. Veterinary Parasitilogy 182: 307-318Rangel, D.E.N., E.K.K. Fernandes, G.U.L. Braga, and D. W. Roberts. 2011. Visible light during mycelial growth and conidiation of Meterhizium robertsii produces conidia with increased stress tolerance. FEM Microbiological Lett 315: 81-86.
Gonzales, F.P., S.H. da Silva, D.W. Roberts, and G.U.L. Braga. 2010. Photodynamic inactivation of conidia of the fungi Metarhizium anisopliae and Aspergillus nidulans with methylene blue and toluidine blue. Photochemistry and Photobiology 86: 653-661.
Rangel, D.E.N., E.K.K. Fernandes, S. J. Dettenmaier, and D. W. Roberts. 2010. Thermotolerance of germlings and mycelium of the insect pathogenic fungus Metarhizium spp. and mycelial recovery after heat stress. Journal of Basic Microbiology 50: 344-350.
Barros, B.H.R., S. H. da Silva, E.R. Marques, J.C. Rosa, A.P. Yatsuda, D.W. Roberts, and G.U. L. Braga. 2010. A proteomic approach to identifying proteins differentially expressed in conidia and mycelium of the entomopathogenic fungus Metarhizium acridum. Fungal Biology 114: 572-579.
Fernandes, E. K. K., C.A. Keyser, D. E. N. Rangel, R.N. Foster, and D. W. Roberts. 2010. CTC medium: A novel dodine-free selective medium for isolating entomopathogenic fungi, especially Metarhizium acridum, from soil. Biological Control 54: 197-205.
Fang, W., E.K.K. Fernandes, D.W. Roberts, M.J. Bidochka, and R.J. St. Leger. 2010. A laccase exclusively expressed by Metarhizium anisopliae during isotropic growth is involved in pigmentation, tolerance to abiotic stresses and virulence. Fungal Genetics and Biology 47: 602-607.
Carollo, C.A., A.L.A. Calil, L.A. Schiave, T. Guaratini, D.W. Roberts, N.P. Lopes, and G.U.L. Braga. 2010. Fungal tyrosine betaine, a novel seconday metabolite from conidia of entomopathogenic Metarhizium spp. fungi. Fungal Biology 114: 473-480.
Rangel, D.E.N., S. J. Dettenmaier, E.K.K. Fernandes, and D. W. Roberts. 2010. Susceptibility of Metarhizium spp. and other entomopathogenic fungi to dodine-based selective media. Biocontrol Science and Technology 20: 4, 375-389.
Li, Z., S.B. Alves, D.W. Roberts, M. Fan, I. Delalibera,Jr., J. Tang, R.B. Lopes, M. Faria, and D.E.N. Rangel. 2010. Biological control of insects in Brazil and China: history, current programs and reasons for their successes using entomopathogenic fungi. Biocontrol Science and Technology 20: 2, 117-136.
Fernandes, E. K. K., C.A. Keyser, J.P. Chong, D. E. N. Rangel, M. P. Miller, and D. W. Roberts. 2010. Characterization of Metarhizium species and varieties based on molecular analysis, heat tolerance and cold activity. Journal of Applied Microbiology. 108:115–128.
Fernandes, E. K. K., A. M. L. Moraes, R. S. Pacheco, D. E. N. Rangel, M. P. Miller, V. R. E. P. Bittencourt, and D. W. Roberts. 2009. Genetic diversity among Brazilian isolates of Beauveria bassiana: comparisons with non-Brazilian isolates and other Beauveria species. Journal of Applied Microbiology. 107: 760-774.
Rangel, D. E. N., A. J. Anderson and D. W. Roberts. 2008. Evaluating physical and nutritional stress during mycelial growth as inducers of tolerance to heat and UV-B radiation in Metarhizium anisopliae conidia. Mycological Research. 112: 1362-1372.
Rangel, D. E. N., D. G. Alston and D. W. Roberts. 2008. Effects of physical and nutritional stress conditions during culture on conidial germination speed, adhesion to host cuticle, and virulence of Metarhizium anisopliae, an entomopathogenic fungus. Mycological Research. 112: 1355-1361
Fernandes, E. K. K; D. E. N. Rangel; A. M. L. Moraes; V. R. E. P. Bittencourt; and D. W. Roberts. 2008. Cold activity of Beauveria and Metarhizium, and thermotolerance of Beauveria. J. Invertebrate Pathology. 98(1) 69-78.
Fernandes, E. K. K.; D. E. N. Rangel; A. M. L. Moraes; V. R. E. P. Bittencourt; and D. W. Roberts. 2007. Variability in tolerance to UV-B radiation among Beauveria spp. isolates. J. Invertebrate Pathology. 96(3): 237-243.
Rangel, D. E. N. and D. W. Roberts. 2007. Inducing UV-B tolerance of Metarhizium anisopliae var. anisopliae conidia results in a trade-off between conidial production and conidial stress tolerance. Journal of Anhui Agriculture University, Hefei, China. 34(2) 195-202.
Roberts, D. W., D. E. N. Rangel, C. A. Keyser, H. G. Bignayan, S. J. Dettenmaier, E. K. K. Fernandes, M. P. Miller, and E. W. Evans. 2007. The Mormon cricket, an old threat in modern day western USA: A search for fungal pathogens. Journal of Anhui Agriculture University, Hefei, China. 34(2): 141-148.
Rangel, D.E.N., M.J. Butler, J. Torabinejad, A.J. Anderson, G.U.L. Braga, A.W. Day, and D.W. Roberts. 2006. Mutants and isolates of Metarhizium anisopliae are diverse in their relationships between conidial pigmentation and stress tolerance. J. Invertebrate Pathology. 93(3): 170-182.
Rangel, D.E.N., A.J. Anderson, and D.W. Roberts. 2006. Growth of Metarhizium anisopliae on non-preferred carbon sources yields conidia with increased UV-B tolerance. J. Invertebrate Pathology. 93: 127-134.
Braga, G.U.L., D.E.N. Rangel, S.D. Flint, A.J. Anderson, and D.W. Roberts. 2006. Conidial pigmentation is important to tolerance against solar-simulated radiation in the entomopathogenic fungus Metarhizium anisopliae. Photochemistry and Photobiology. 82(2): 418-422.
Alston, D. G., D. E. N. Rangel, L. A. Lacey, H. G. Golez, J. J. Kim, and D. W. Roberts. 2005. Evaluation of novel fungus and nematode isolates for control of Conotrachelus nenuphar (Coleoptera: Curculionidae) larvae. Biological Control. 35: 163-171.
Rangel, D.E.N., G.U.L. Braga, A.J. Anderson, and D.W. Roberts. 2005. Influence of growth environment on tolerance to UV-B radiation, germination speed and morphology of Metarhizium anisopliae var. acridum conidia. J. Invertebrate Pathology. 90(1): 55-58.
Castrillo, L. A., D. W. Roberts, and J. D. Vandenberg. 2005. The fungal past, present and future: Germination, ramification and reproduction. J. Invertebrate Pathology. 89(1): 46-56.
Kim, J. J., K. C. Kim and D. W. Roberts. 2005. Impact of the entomopathogenic fungus Verticullium lecanii on development of an aphid parasitoid, Aphidius colemani. J. Invertebrate Pathology. 88(3): 254-256.
Rangel, D.E.N., G.U.L. Braga, A.J. Anderson, and D.W. Roberts. 2005. Variability in conidial thermotolerance of Metarhizium anisopliae isolates from different geographic orgins. J. Invertebrate Pathology. 88:116-125.
Leite, L.G., S.B. Alves, A.B. Filho, and D. W. Roberts. 2005. Simple, inexpensive media for mass production of three entomophthoralean fungi. Mycological Research. 109(3): 326-334.
Rangel, D. E.N., G.U.L. Braga, S.D. Flint, A.J. Anderson, and D.W. Roberts. 2004. Variations in UV-B tolerance and germination speed of Metarhizium anisopliae conidia produced on insects and artificial substrates. J. Invertebrate Pathology. 87(2-3): 77-83.
Roberts, D.W. and R.J. St. Leger. 2004. Metarhizium spp., Cosmopolitan Insect-Pathogenic Fungi: Mycological aspects. Pp. 1-70. In: Advances in Applied Microbiology. (A.I. Laskin, J.W. Bennett, and G. Gadd, eds.). Elsevier Inc., London, U.K. Vol. 54, 400 pp.
Miller, C.D., D. Rangel, G.U.L. Braga, S. Flint, Sun-Il Kwon, C.L. Messias, D.W. Roberts and A.J. Anderson. 2004. Enzyme activities associated with oxidative stress in Metarhizium anisopliae during germination, mycelial conidiation and in response to near-UV irradiation. Canadian Journal of Microbiology. 50 (1): 41-49.
Bechara, I. J., N.N. Youssef, and D.W. Roberts. 2003. Histologic study of head cartilage degeneration in rainbow trout (Oncorhynchus mykiss) infected with the parasite Myxobolus cerebralis. J. Submicrosc. Cytol. Pathol. 35 (2): 111-116.
Leite, L.G., S.B. Alves, A. Batista Filho, and D.W. Roberts. 2003. Effects of salts, vitamins, sugars and nitrogen sources on the growth of three genera of Entomophthorales: Batkoa, Furia and Neozygites. Mycological Research. 107 (7): 872-878.
Wraight, S.P., S. Galaini-Wright, R.I. Carruthers, and D.W. Roberts. 2003. Zoophthora radicans (Zygomycetes: Entomophthorales) conidia production from Empoasca kraemeri and dry-formulated mycelium under laboratory and field conditions. Biological Control. 28(1): 60-77.