Background

The patterns on outer and end walls of conidia observed in scanning electron microscopy (MEB) combined with light microscopy (ML) analysis are a powerful tool for the identification of Erysiphales anamorph species.

Objective

To perform a morphological analysis by MEB of Erysiphales anamorphs present on sundrops (Oenothera fruticosa), common marigold (Calendula officinalis), bigleaf hydrangea (Hydrangea macrophylla), oxeye daisy (Leucanthemum vulgare) and lemon (Citrus limon) plants.

Methods

The morphological characterization of Erysiphales specimens was performed by SEM and complemented using ML.

Results and conclusions

The examination by MEB allowed the characterization of conidiophores, conidia, hyphal appressoria, hyphae, and germ tubes of Erysiphe sp., Podosphaera xanthii, Pseudoidium hortensiae, Golovinomyces macrocarpus and Erysiphe quercicola. To our knowledge, this is the first report of Golovinomyces macrocarpus causing powdery mildew on L. vulgare in Mexico.