(Apples & Pears)
Description: : Can cause severe damage to apple and pear
trees. Fire blight usually attacks blossoms, but infection
and dieback of new shoots is common (see photo). The
downward curled twig tip is characteristic of fire blight.
Solution: Cut off
infected twigs and branches 12" below the dead area.
Disinfect pruning tool between cuts by dipping in 10%
solution of liquid bleach to avoid spreading disease.
Control blight by spraying Soap-Shield® Fungicidal Soap
at silver tip and bud break, and repeat at 3-5 day intervals
as needed, up to petal fall. Use at the rate of 1 oz.
per gallon if disease pressure is light, 2 ozs. per
gallon if disease conditions favor heavy disease pressure.
Note: Soap-Shield, as used in this recommendation, may
cause russetting of Golden Delicious and similar susceptible
Fire blight can also be controlled by applying Fire Blight Spray every 3-4 days
during bloom time, and then at 5-7 day intervals. (We
prefer Soap-Shield because, in addition to fire blight,
it controls a wide range of fruit tree diseases.) To
control sucking insects such as aphids, leafhoppers,
and plant bugs, which spread fire blight, use PyolaTM Insecticidal
Spray every 10 days from time leaf tips appear
until petal fall, then every 14 days.