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- Author or Editor: R. Sheldrake Jr. x
Abstract
In the past two years a new concept of thermal dusting with Tetrachloroisophthalonitrile (Termil) for the control of Botytris cinerea on greenhouse crops of geranium (Pelorgonium hortorum) has proven to be very successful and practical. This fungus frequently causes leaf and bract injury to crops of poinsettia (Euphorbia pulcherrima) in greenhouses in late November and December. This study was initiated to determine the phototoxicity of the commercial product Termil used with the special alcohol burner and applied as a thermal dust.
Abstract
‘Cardinal Sim’ carnations were grown for 2 years in 6 media combinations that were supplemented with 2 particle sizes of vermiculite. The addition of vermiculite resulted in significantly higher K levels in carnation foliage the first year than in control plants. The positive effect of vermiculite persisted through the second year but at a lower level. A combination of 1-1-1 by volume sphagnum peat moss, perlite and #4 vermiculite was as good a growing medium as the control soil when compared on a total production and quality index basis.