Dollar Spot (Moellerodiscus/Lanzia homoecarpa)
Even as methods for controlling dollar spot become
The pathogen that causes dollar spot is from at least
more sophisticated, it is very clear that dollar spot is
two strains of fungus— Moellerodiscus or Lanzia
becoming an increasingly troublesome disease to
homoecarpa (formerly Sclerotinia homoecarpa). This
control. Several key factors
pathogen infects the shoots of grasses and can survive
and changes in golf course
unfavorable environmental periods as mycelium in
management have
infected plants.
impacted the severity and
frequency of this disease.
Beneficial Cultural Practices Include:
These factors play a
■
Providing balanced fertility but not excessive nitrogen.
significant role in dollar
■
Removing dew by either irrigation or mechanical
means, especially on fairways.
spot severity and in expectations associated with
fungicidal control.
■
If cool, wet conditions persist, using a plant growth
regulator such as Primo MAXX® or Trimmit® 2SC
Dollar spot symptoms are typically small, circular, sunken,
to help reduce growth and treatment loss from
straw colored patches of 1–2 inches in diameter. Heavy
excessive mowing and to provide the desired length
dollar spot infections can result in individual spots
of disease control through such periods.
coalescing to form larger, irregular shaped patches.
Grayish white fungal mycelium can sometimes be
Chemical Control:
observed in early morning on newly formed spots
Fungicide applications should be allowed to dry on
especially with heavy dews. Generally, dollar spot can
foliage before mowing to maximize the length of
be identified by the hourglass shape of the lesion on
disease control.
the individual leaf blade.
Apply fungicides
in sufficient
Cool nights, warm days, and dew formation favor dollar
water to attain
spot development.
good coverage
High humidity within
of turfgrass. Two
the turf canopy and
gallons per 1000
temperatures between
ft 2 on greens and tees and 1–2 gallons per 1000 ft 2 on
59– 86°F are ideal for
fairway applications are recommended. Flat fan spray
disease infection.
nozzles will provide the most uniform coverage and
Closely mowed turf can
maximize the length of disease control. Fungicides that
create a tight canopy
provide control include the following:
and facilitate mycelium growth across leaf tip wounds.
■
Propiconazole (Banner MAXX® )
Low nitrogen fertility and dry soils tend to increase turf
■
Chlorothalonil (Daconil ULTREX® ,
grass susceptibility to dollar spot. Other factors that
increase susceptibility to dollar spot disease are drought,
thick thatch, and compacted soil.
Daconil Weather Stik®, Daconil Zn®)
An Effective Program to Control Dollar Spot:
Greens and Tees
Daconil ULTREX or
2.0 oz /1M or
Daconil Weather Stik or
2.0 oz /1M
Daconil Zn +
Banner MAXX
3.0 oz /1M plus
0.5 oz /1M
Daconil ULTREX or
3.5 oz /1M or
Daconil Weather Stik or
3.0 oz /1M
Daconil Zn +
Banner MAXX
5.0 oz /1M plus
0.5 oz /1M
7–14 Day Schedule
Apply when disease conditions
are favorable for development.
Use the shortest spray interval
if disease conditions become
severe.
14 –21 Day Schedule
Fairways
Daconil ULTREX or
2.0 oz /1M or
Daconil Weather Stik or
2.0 oz /1M
Daconil Zn +
Banner MAXX or
Banner MAXX
3.0 oz /1M plus
1.0 oz /1M or
2.0 oz /1M
14 –21 Day Schedule
Apply when disease conditions
are favorable for development.
Use the shortest spray interval
if disease conditions become
severe. Use highest rate for
longer residual control.
21–28 Day Schedule
Figure 1: Dollar Spot Incidence, 2000, Uddin, Penn State University
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