Premium
Phytotoxicity of methyl bromide on chrysanthemum cuttings
Author(s) -
HELYER N. L.,
LEDIEU M. S.
Publication year - 1989
Publication title -
annals of applied biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.677
H-Index - 80
eISSN - 1744-7348
pISSN - 0003-4746
DOI - 10.1111/j.1744-7348.1989.tb06782.x
Subject(s) - cutting , phytotoxicity , biology , fumigation , horticulture , bromide , botany , chemistry , organic chemistry
Summary The phytotoxicity of methyl bromide gas on chrysanthemum cuttings was investigated in relation to gas concentration, length of exposure, temperature, and variety and age of cuttings. Concentrations of 10.5 to 13.5 g/m 3 for 4 to 5 h produced a concentration time product (CTP) of 54 g h/m 3 which is suitable for safe fumigation of most varieties of chrysanthemum. Length of exposure was not critical up to 5 h. However, fumigations of cuttings which were more than 3 wk old generally caused excessive phytotoxicity and therefore cannot be recommended. There was less damage at temperatures of between 14 and 16°C than at higher temperatures. A table of predictions from a fitted regression equation is included to demonstrate the increased susceptibility of chrysanthemums at higher temperatures and ages of cuttings.