Selection of (Hypocreales: Cordycipitaceae) strains to control (Curculionidae: Scolytinae) females.

Background: Eichhoff (Coleoptera: Curculionidae) is an ambrosia beetle reported to affect avocado trees ( Mill.). The use of the entomopathogenic fungus (EPF) (Bals.

The endophytic capacity of the entomopathogenic fungus caused inherent physiological response in two barley () varieties.

In this study, the endophytic capacity of was determined for two barley () varieties, Josefa and Esmeralda, inoculated with a seedling immersion at three different concentrations (1 × 10, 1 × 10 and 1 × 10 conidia/mL). Seedling length and chlorophyll content were found to be not affected when inoculated with the entomopathogenic fungus, in both barley varieties. However, the colonisation percentage was found to be significantly lower with the inoculum concentration 1 × 10 conidia/mL for both barley varieties ( < 0.

Comparison between superficial and solid-state cultures of Isaria fumosorosea: conidial yields, quality and sensitivity to oxidant conditions.

Conidia production and quality from mycoinsecticides in solid-state cultures (SSC) are frequently inferred from superficial culture (SC) results. Both parameters were evaluated for two Isaria fumosorosea strains (ARSEF 3302 and CNRCB1), in SC and SSC, using culture media with the same chemical composition. For both strains, conidia production was higher in SC than SSC in terms of conidia per gram of dry substrate.

Variations in oxygen concentration cause differential antioxidant response and expression of related genes in Beauveria bassiana.

The entomopathogenic fungus Beauveria bassiana is widely used in pest biocontrol strategies. We evaluated both the antioxidant response mediated by compatible solutes, trehalose or mannitol, and the expression of related genes using oxygen pulses at three oxygen concentrations in solid state culture (SSC): normal atmosphere (21% O2), low oxygen (16% O2) and enriched oxygen (26% O2). Trehalose concentration decreased 75% after atmospheric modifications in the cultures, whereas mannitol synthesis was three-fold higher under the 16% O2 pulses relative to normal atmosphere (100 and 30 μg mannitol mg(-1) biomass, respectively).

Physiological and antioxidant response by Beauveria bassiana Bals (Vuill.) to different oxygen concentrations.

The effect of three levels of oxygen (normal atmosphere (21% O(2)), low oxygen (16% O(2)) and enriched oxygen (26% O(2))) on the production and germination of conidia by Beauveria bassiana was evaluated using rice as a substrate. The maximum yield of conidia was achieved under hypoxia (16% O(2)) after 8 days of culture (1.51 × 10(9) conidia per gram of initial dry substrate), representing an increase of 32% compared to the normal atmosphere.