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Herbivore-induced plant volatiles (HIPVs) are clues that help predatory insects search for food. The hypothesis that entomopathogenic fungi, which protect plants, benefit from the release of HIPVs was tested. The plant  Arabidopsis thaliana  was used as the source of HIPVs. The insect herbivore  Lipaphis erysimi  (Kaltenbach) was used as the inducer, and the fungal pathogen of the aphid  Lecanicillium lecanii  was exposed to HIPVs to test our hypothesis. When exposed to aphid-induced  A .  thaliana  volatiles, the mortality of aphids pre-treated with a conidial suspension of  L .  lecanii , the conidial germination and the appressorial formation were significantly increased compared with the control. The decan-3-ol and 4-methylpentyl isothiocyanate that were detected in the headspace seemed to have positive and negative affection, respectively. Moreover, HIPVs generated from groups of eight aphids per plant promoted significantly increased conidial germination and appressorial formation compared with HIPVs from groups of one, two and four aphids per plant. Our results demonstrated that the pathogenicity of the entomopathogenic fungus  L .  lecanii  was enhanced when exposed to HIPVs and that the HIPVs were affected by the number of insect herbivores that induced them.

Volatiles from Plants Induced by Multiple Aphid Attacks Promote Conidial Performance of Lecanicillium lecanii