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Common name: tebuconazole (BSI, draft E-ISO)
Other names: fenetrazole*; terbuconazole*; terbutrazole*;
ethyltrianol*
CAS RN: [107534-96-3]
PHYSICAL CHEMISTRY
Composition: Racemate.
Mol. wt.: 307.8
M.f.: C16H22ClN3O
Form: Colourless crystals; (tech., colourless to light brown
powder).
M.p.: 105 ºC
V.p.: 1.7 ?10-3 mPa (20 ºC) (OECD 104)
KOW logP = 3.7 (20 °C)
Henry: 1 ?10-5 Pa m3 mol-1 (20 °C)
S.g./density: 1.25 (26 °C)
Solubility In water: 36 mg/l (pH 5-9, 20 ºC). In
dichloromethane >200, isopropanol, toluene 50-100, hexane <0.1 (all
in g/l, 20 ºC).
Stability: Stable to elevated temperatures, and to photolysis
and hydrolysis in pure water, under sterile conditions; hydrolysis
DT50 >1 y (pH 4-9, 22 °C).
APPLICATIONS
Mode of action: Systemic fungicide with protective, curative,
and eradicant action. Rapidly absorbed into the vegetative parts of
the plant, with translocation principally acropetally.
Uses: As a seed dressing, tebuconazole is effective against
various smut and bunt diseases of cereals such as Tilletia spp.,
Ustilago spp., and Urocystis spp., also against Septoria nodorum
(seed-borne), at 1-3 g/dt seed; and Sphacelotheca reiliana in maize,
at 7.5 g/dt seed. As a spray, tebuconazole controls numerous
pathogens in various crops including: rust species (Puccinia spp.)
at 125-250 g/ha, powdery mildew (Erysiphe graminis) at 200-250 g/ha,
scald (Rhynchosporium secalis) at 200-312 g/ha, Septoria spp. at
200-250 g/ha, Pyrenophora spp. at 200-312 g/ha, Cochliobolus sativus
at 150-200 g/ha, and head scab (Fusarium spp.) at 188-250 g/ha, in
cereals; leaf spots (Mycosphaerella spp.) at 125-250 g/ha, leaf rust
(Puccinia arachidis) at 125 g/ha, and Sclerotium rolfsii at 200-250
g/ha, in peanuts; black leaf streak (Mycosphaerella fijiensis) at
100 g/ha, in bananas; stem rot (Sclerotinia sclerotiorum) at 250-375
g/ha, Alternaria spp. at 150-250 g/ha, stem canker (Leptosphaeria
maculans) at 250 g/ha, and Pyrenopeziza brassicae at 125-250 g/ha,
in oilseed rape; blister blight (Exobasidium vexans) at 25 g/ha, in
tea; Phakopsora pachyrhizi at 100-150 g/ha, in soya beans; Monilinia
spp. at 12.5-18.8 g/100 l, powdery mildew (Podosphaera leucotricha)
at 10.0-12.5 g/100 l, Sphaerotheca pannosa at 12.5-18.8 g/100 l,
scab (Venturia spp.) at 7.5-10.0 g/100 l, white rot in apples
(Botryosphaeria dothidea) at 25 g/100 l, in pome and stone fruit;
powdery mildew (Uncinula necator) at 100 g/ha, in grapevines; rust
(Hemileia vastatrix) at 125-250 g/ha, berry spot disease (Cercospora
coffeicola) at 188-250 g/ha, and American leaf disease (Mycena
citricolor) at 125-188 g/ha, in coffee; white rot (Sclerotium
cepivorum) at 250-375 g/ha, and purple blotch (Alternaria porri) at
125-250 g/ha, in bulb vegetables; leaf spot (Phaeoisariopsis
griseola) at 250 g/ha, in beans; early blight (Alternaria solani) at
150-200 g/ha, in tomatoes and potatoes.
Phytotoxicity: Good plant compatibility in most crops with
any formulation, and achieved in more sensitive crops by appropriate
formulations, e.g. WP, WG or SC.
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