Applying drenches It can be a challenge to apply a drench to a closely spaced poinsettia crop. Chemical Container Corporation and The Dramm Corporation have developed new equipment, which precisely doses the correct volume. Research has shown this application method to be effective. This application method reduces the labor of application to each individual pot and also eliminates damage to plants that may occur while the applicator walks through the closely spaced crop. Fruits and flowers of plants are generally more susceptible to infection than healthy, nonsenescent leaves.
Poinsettias are susceptible at all stages of production.
During propagation, leaves may become blighted and cuttings may rot. On potted poinsettias, tan to brown lesions form on leaves, stems and bracts. Extensive tan cankers can form on stems when Botrytis enters via blighted petioles or shoots. Lesions begin at the margins of bracts, turning darker as they expand. Latex may exude from the undersides of lesions.