Bouamama N. auteur aut IRD Vidal Claire auteur aut IRD Fargues J. auteur aut IRD text journalArticle eng text/pdf born digital access Quiescent conidia of Isaria fumosorosea were submitted to various wetting-drying cycles under different regimes of temperature and air humidity. Germination and viability of conidia collected on cultures freshly host-passed (P2) were not affected at 25 degrees C during five cycles at increasing wet phase duration (2-12 h per daily cycle) under any moisture conditions (13-86% RH). Infectivity levels remained stable, but mortality was slightly postponed. In vitro-cultured inocula (P5) were significantly affected after only one cycle at higher air humidity (75 and 86% RH) and temperature (35 and 40 degrees C). The persistence of I. fumosorosea conidia suspended in water soluble extracts of leaf surfaces (corn and cabbage) confirmed the better persistence of P2 conidia and the relatively higher detrimental effect of lower air humidity conditions when combined with moderate temperatures. Quiescent conidia deposited in situ on potted plants of cabbage showed a higher persistence on wet foliage and on foliage submitted to wetting-drying cycles, than on dry foliage. These results underline that constraints prevailing in targeted environments and ecological fitness of fungal isolates have to be taken into account for assessing microbial control strategies. specialized Entomopathogens Isaria fumosorosea Conidial persistence Wetting-drying stress Host passaging Leaf surface substances Ecological fitness 076 55 3 203-210 2010 1049-9644 https://www.documentation.ird.fr/hor/fdi:010052873 10.1016/j.biocontrol.2010.07.011 1049-9644 [F B010052873] https://www.documentation.ird.fr/hor/fdi:010052873 https://www.documentation.ird.fr/intranet/publi/2010/11/010052873.pdf Accès réservé (Intranet de l'IRD) IRD - Base Horizon / Pleins textes 2010-12-03 2017-08-23 fdi:010052873 fre