Robigus
In opposition to Flora we find an antagonistic divinity, called Robigus, a worker of evil, who delighted in the destruction of the tender herbs by mildew, and whose wrath could only be averted by prayers and sacrifices, when he was invoked under the title of Averuncus, or the Avertor.
The festival of Robigus (the Robigalia) was celebrated on the 25th of April.