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Improvements in the formulation of biological insecticides are crucial to increase their stability and competitiveness in the market. The aim of this work was to evaluate the use of volcanic materials with different hydric retention capacities to increase the thermotolerance of B. bassiana conidia. Two pyroclastic rocks and a zeolite clinoptilolite were selected for this study. In addition, a commercial silica gel was used due to its reported capacity to increase conidial thermotolerance. Dry conidia were mixed with the materials to obtain a 2% w/w granular formulation, while conidial powder alone served as the control. Mixtures were stored at room temperature for 30 days and then exposed to 50 oC for two hours, and the viability was measured before and after the thermal exposure. No significant decrease in viability was observed for conidia stored with any of the pyroclastic materials, while the germination was reduced by 10, 17 and 23% for unformulated conidia, conidia stored with silica gel and conidia stored with zeolite, respectively. From these results, a pyroclastic rock was selected to test its capacity to maintain high viability under different temperatures (4, 25 and 35 oC) and humidities (~0 and 20%). A decrease in viability was observed with an increase of temperature, and lower viability was also recorded in humid treatments, but only at 25 and 35 oC. La optimizacion de las formulaciones de insecticidas biologicos resulta crucial para poder mejorar su estabilidad y competitividad en el mercado. El objetivo de este trabajo fue evaluar el uso de materiales volcanicos con diferente capacidad de retencion hidrica para incrementar la termotolerancia de los conidios de B. bassiana . Para ello se seleccionaron dos tipos de rocas piroclasticas y una zeolita clinoptilolita. Ademas se uso silica gel comercial debido a su conocida capacidad de incrementar la termotolerancia de los conidios. Los conidios secos fueron mezclados con los materiales para obtener una formulacion en granulos al 2% p/p, mientras que el polvo de conidios sin aditivos se uso como control. Las mezclas se almacenaron a temperatura ambiente por 30 dias y luego se expusieron a 50 oC durante dos horas. La viabilidad se midio antes y despues de la exposicion a alta temperatura. La viabilidad no se vio afectada por las altas temperaturas en los conidios almacenados con materiales piroclasticos, mientras que hubo una reduccion del 10, 17 y 23% en la germinacion en los conidios no formulados y en los conidios almacenados con silica gel y zeolita respectivamente. Sobre la base de estos resultados se selecciono una de las rocas piroclasticas para testear su capacidad de mantener una alta viabilidad bajo diferentes temperaturas (4, 25 y 35 oC) y humedades (~0 and 20%). Se observo una disminucion en la viabilidad al aumentar la temperatura y tambien fue menor la viabilidad en los tratamientos humedos, pero solamente a 25 y 35 oC.

Volcanic materials as carriers for the formulation of mycoinsecticides using the fungus Beauveria bassiana