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Here: Management Updates
2004 Archive
June 8, 2004
Latest Message
Date: June 8, 2004
Category: Diseases
Subject: Cultural Practices for Fungicide Effectiveness
A short review to make your fungicides work better:
As we enter the summer weather period, turf goes under stress and diseases
such as anthracnose are active. Please keep in mind that fungicides can
do wonderful things for turf diseases, but they work well only when combined
with cultural practices that help the turf plants recover and grow out
of the damaged tissues. Anthracnose and dollar spot are especially good
examples of how important it is to focus on good turf management. In the
recovery period:
- provide adequate water
- provide adequate nitrogen
- temporarily raise mowing height
- try to skip clean-up pass
- avoid sand top-dressing
- avoid growth regulators
- open compacted greens (solid tines, hydroject, etc)
There are basically 4 kinds of fungicides:
- contact/protectants: Apply with enough water
to coat the leaves. Do not water in. Once the grass has grown
and been mowed off, you will need to re-apply. Examples: chlorothalonil,
Medallion™.
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- localized systemics: Examples: iprodione, vinclozolin,
Compass™.
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- upward-moving systemics: For root protection
(e.g. summer patch, take-all patch), these must be watered in
while still wet on the leaves. For basal rot/crown rot anthracnose,
water into the crown area while still wet on the leaves. If you
also want to protect the leaves with a contact, you must apply
the contact separately and allow it to dry on the leaves. Examples:
thiophanate-methyl, DMIs (Banner™, Bayleton™, Eagle™),
strobilurins (Heritage™, Insignia™)
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- only fosetyl-Al (Signature™, etc.) will
move into roots from a foliar application. This is for Pythium
diseases and stress tolerance. If you have another kind of active
disease, choose a labeled fungicide.
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Visit the Online Publications
section and see the online fungicide chart for details.
- Submitted by: Dr. Gail Schumann |
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