Penthos is a systemic specialty fungicide. It is rapidly absorbed by the leaves or stems and translocated upward throughthe xylem. Penthos is a potent ergosterol biosynthesis inhibitor.ergosterol, a principal sterol in most fungi is an indispensablecomponent in the membrane structures. First spray at theinitiation of infesatation and subsequent spray after 7 to10 days of the first spray or as and when required.