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The curative activity of non‐ionic surface‐active agents against some powdery mildew diseases
Author(s) -
EVANS E.,
MARSHALL J.,
COUZENS B. J.,
RUNHAM R. L.
Publication year - 1970
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.1744-7348.1970.tb05515.x
Subject(s) - powdery mildew , sphaerotheca , fungicide , biology , mildew , ethylene oxide , horticulture , toxicology , agronomy , chemistry , organic chemistry , copolymer , polymer
SUMMARY Eight non‐ionic surfactants of the general formula RO(C 2 H 4 O) n H were examined as fungicides for the control of various powdery mildew diseases. Those based on the condensation products of cetyl and oleyl alcohol with ethylene oxide were effective only as curative fungicides, having very little protective potential. This activity was greatest in products with n = 6–10. The most effective derivative, having eight ethylene oxide units, was particularly active in greenhouse tests against Sphaerotheca fuliginea on cucumber, S. pannosa on roses, and Podosphaera leucotricha on apples at concentrations which were not damaging to these crops. Although this compound caused damage to apples in the field it was effective against rose mildew and apple mildew, and its purely curative action gave a level of control equal to the standard dinitro compounds, which are capable of acting as either protectant or curative fungicides. This suggests that the dinitro‐compounds also probably act mainly in a curative fashion against these diseases in the field.