The invention discloses a use method of pharmaceutical composition for preventing and treating
powdery mildew. The use method includes the following steps that A. a
stock solution is prepared, and components of the
stock solution are 30% difenoconazole, 80%
thiophanate methyl
wettable powder, mint,
cassia twig,
baicalein, 75%
chlorothalonil,
gypsum and fructus anidii; B. water is added into the
stock solution to be mixed to prepare
diluent of 400-600
mass multiple ratio; C. 3.5-4kg of the
diluent is used for each mu, spraying is conducted evenly on the front and the back of each leaf, especially on sick leaves, and spraying protection is conducted on upper healthy leaves; D.
fertilizer is supplemented 3 days after the spraying is conducted, fertilizing loss and premature senility are prevented,
plant disease resistance is improved, watering is not required in cloudy days after
fertilizer is applied, ventilation is often conducted in sunny days,
relative humidity of a
greenhouse is reduced, temperature is prevented from being too high, and stuffiness is prevented; E. 3 days after spraying, sulphur smudging is conducted, and smudging is conducted for 10 minutes every day in the
greenhouse. The use method is easy in matching, convenient to use and good in cucumber
mildew treating effect. Through the tests,
diluent of mixture of 400-600
mass multiple ratio has a remarkable inactivation effect on
eubacterium fungi imperfecti sphaerotheca fuliginea
powdery mildew and is good in sterilizing effect.