Greenhouse Update - March 21, 2005
Leaf Curling on New Guinea Impatiens -- some leaf curling and distortion was seen on certain varieties of New Guinea Impatiens on the week of March 7th. See photo. Fortunately the plants seem to be growing out of it and doing better. No broad mites were found with closer examination under the microscope. According to Rick Yates, Technical Support Manager from Griffin Greenhouse and Nursery Supplies, it seems to be a physiological disorder that usually occurs at the same time each year (i.e. late winter to early spring). According to Rick, this leaf curling appears to occur during the same environmental conditions that encourage edema in ivy geraniums (high humidity, dry media).
Shiny, dark green leaves with a wavy leaf surface on some cultivars may indicate high salts. See photo. Avoid fertilizing young plants for the first two to three weeks after transplanting. Once established, start feeding lightly at 100 to 150 ppm and be sure to leach with clean water every third watering or so to avoid salt buildup.
Aphids -- are starting to appear on some of their favorite plants including mandevilla, verbena, hollyhock and malva among others. Randomly inspect favored hosts and weeds for signs of aphids -- shed skins, honeydew and distorted growth. Systemic insecticides such as Tristar, Flagship (as a spray), and Marathon seem to be performing well. Many growers report very good results when using Endeavor, which is a highly selective, systemic insecticide with reduced risk status. With thorough coverage, contacts such as ultra fine oil, or synergy super fine spray oil can also be used. (Test first for plant safety and follow all label precautions).
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Previous 2005 Greenhouse Updates
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