Mycoherbicidal preparations to selectively control weeds typically require high inoculum levels and long dew periods for establishment. The dew requirement was obviated and the inoculum threshold was reduced to one conidium per droplet when an invert emulsion was used as an adjuvant. Invert emulsion also abolished the selectivity of Alternaria cassiae and A. crassa. A. cassiae attacked eight plant species, including soybean and members of other families. The emulsion also facilitated cross-infectivity by A. crassa, a mycoherbicide specific to Datura spp., Cassia obtusifolia, and other species (...)
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Ziva Amsellem (1991) studied this question.