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Abstract On Rose Diseases

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Disease Control

Multi-Purpose Fungicide Daconil 2787 Plant Disease Control

This product is widely used for broad spectrum disease control on lawns,
ornamentals and listed
fruits and vegetables. Controls many foliar diseases such as: rust, black spot, leaf
spot, blights,
anthracnose and powdery mildew as listed on the label. Also controls conifer
diseases and lawn
diseases such as brown patch, red thread, rust and dollar spot. Can be mixed with
insecticides as
specified on the label to make a multi-purpose spray.

WHAT IS POWDERY MILDEW?

Powdery Mildew looks like white fuzzy powder that accumulates on leaves and stems
predominantly in spring, and again to a lesser degree in fall. It is actually a fungus that
is spread by
millions of microscopic spores. It imbeds itself into tender new growth and feeds on
the sap of the
plant. By the time the naked eye can see the white 'powder,' it has already invaded
the plant tissue
and is feeding and reproducing at a rapid pace. As it spreads itself on the surface, it
eventually kills
the cells of the plant leaf, leaving the leaf rippled and curled.

Mildew spores are everywhere in the garden - in the air, the soil, on debris and on
plant surfaces -
ready to sprout when the environment is just right. Warm days (50?-80?F) and cool
nights with
elevated humidity and resultant dew provide ideal conditions. Though humidity
promotes fungal
growth, it grows on DRY plant surfaces, unlike blackspot which requires immersion in
water for
about seven hours in order for infection to take place.

Tender new growth needs a chance to 'harden' and develop its waxy coating that
provides somewhat
of a barrier to fungal growth. Therefore, the rosarian must provide protection for new
spring growth
on a weekly basis.

CONTROLLING POWDERY MILDEW

Controlling mildew doesn't have to mean spraying the planet...