Brown rot—Monilinia spp.
Blossoms on plants infected with Monilinia brown
and wither. Dead blossoms often cling to twigs for a long
time. Sunken, brown areas may develop around twigs at the
base of infected flowers, causing leaves at the tips of
twigs to shrivel up. Brown, sticky droplets of gum may exude
from the base of dead flowers and the bark of infected twigs.
Velvety gray or tan tufts of spores are formed on diseased
blossoms or twig cankers. Brown or tan spots spread rapidly
over the fruit surface and produce spores.
Prompt removal and destruction of fruit mummies and diseased
plant parts prevents the buildup of brown rot inoculum and
helps keep rot below damaging levels. Prune trees to allow
good ventilation. Furrow irrigate or use low-angle sprinklers
to avoid wetting blossoms, foliage, and fruit. Plant varieties
that are least susceptible; check with your local nurseryman.
If you have had problems in the past, applications of copper-containing fungicides
or synthetic fungicides such as myclobutanil at pink bud
stage can help avoid serious losses. Additional applications
when fruit starts to color may be needed if rainy weather
persists. Do not apply copper compounds after bloom.
rot on peach