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The effects of two entomopathogenic fungal endophytes,  Beauveria bassiana  and  Purpureocillium lilacinum  (formerly  Paecilomyces lilacinus ), were assessed on the reproduction of cotton aphid,  Aphis gossypii  Glover (Homoptera:Aphididae), through  in planta  feeding trials. In replicate greenhouse and field trials, cotton plants ( Gossypium hirsutum ) were inoculated as seed treatments with two concentrations of  B. bassiana  or  P. lilacinum  conidia. Positive colonization of cotton by the endophytes was confirmed through potato dextrose agar (PDA) media plating and PCR analysis. Inoculation and colonization of cotton by either  B. bassiana  or  P. lilacinum  negatively affected aphid reproduction over periods of seven and 14 days in a series of greenhouse trials. Field trials were conducted in the summers of 2012 and 2013 in which cotton plants inoculated as seed treatments with  B. bassiana  and  P. lilacinum  were exposed to cotton aphids for 14 days. There was a significant overall effect of endophyte treatment on the number of cotton aphids per plant. Plants inoculated with  B. bassiana  had significantly lower numbers of aphids across both years. The number of aphids on plants inoculated with  P. lilacinum  exhibited a similar, but non-significant, reduction in numbers relative to control plants. We also tested the pathogenicity of both  P. lilacinum  and  B. bassiana  strains used in the experiments against cotton aphids in a survival experiment where 60% and 57% of treated aphids, respectively, died from infection over seven days versus 10% mortality among control insects. Our results demonstrate (i) the successful establishment of  P. lilacinum  and  B. bassiana  as endophytes in cotton via seed inoculation, (ii) subsequent negative effects of the presence of both target endophytes on cotton aphid reproduction using whole plant assays, and (iii) that the  P. lilacinum  strain used is both endophytic and pathogenic to cotton aphids. Our results illustrate the potential of using these endophytes for the biological control of aphids and other herbivores under greenhouse and field conditions.

plos one

The Entomopathogenic Fungal Endophytes Purpureocillium lilacinum (Formerly Paecilomyces lilacinus) and Beauveria bassiana Negatively Affect Cotton Aphid Reproduction under Both Greenhouse and Field Conditions