Virulence and thermotolerance of monospore cultures of Metarhizium anisopliae var. anisopliae Isolated from spittlebugs (Hemiptera: Cercopidae)
DOI:
https://doi.org/10.33885/sf.2008.3.1031Keywords:
biological control, entomopathogenic fungi, agricultural pestsAbstract
The virulence and thermotolerance of 18 monospore cultures of Metarhizium anisopliae var.
anisopliae derived from isolates of the spittlebug (Aeneolamia sp.) in sugarcane were tested. Virulence
was determined by the median lethal time (LT ) in Tenebrio molitor (Coleoptera: Tenebrionidae) 50
pupae and thermotolerance by fungal growth at 25, 30, 35 and 40 °C. Thermotolerance of
monospore isolates was studied by the diameter of the fungal colonies at day 14. Virulence results
revealed EH-481/1, EH-469/6, EH-476/3, EH-474/6, EH-475/2 y EH-473/4, with a LT of 5.19, 5.76, 50
5.97, 6.04, 6.15 and 6.53 days, respectively. The highest growth of isolates and of reference strain FI-
1029, corresponding to M. anisopliae var. anisopliae, same as the isolates from Mexico, occurred at 25
and 30 °C. Growth at 35 °C was very low, and no growth occurred at 40 °C. Results show the relevance
of virulence and thermotolerance studies for strain selection to be used as biological control microbial
agents.
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