Greenhouse Note PSU
Probably the number one pest on poinsettias (as well as other greenhouse crops) is the greenhouse whitefly. During part of their life cycle a colorless secretion is produced by the whitefly larvae. This sticky material serves as a home for a sooty fungus that causes a black discoloration. After the bracts appear, control of the whitefly becomes critical. Growers who experience difficulty in controlling whitefly should use Thiodan 50 WP (1 Ib./lOO gallons) and spray the lower foliage, pots, boards, bench, walks, etc. Thiodan has a fumigating effect and good control of whitefly has been experienced.
Keywords: Weed control Whitefly BUGS Monuron Amazine