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THEME OF THE MONTH: AGRONOMICS
What's Rotting Turf pathology is the study of turf
diseases, and it is not a stagnant field by
any means. Changes in management, con-
patterns. For example, problems in
Minnesota, Wisconsin and Iowa are often a
preview of what is coming to Illinois.
the Turf? struction techniques and materials, weath-
er patterns, grass cultivars, pesticides, fer-
Likewise, northwest Illinois can be used to
assist us in predicting diseases in the
tilizers, herbicides and so on, collectively Chicago area. During the past two years,
Dr. H.T. Wilkinson, Associate Professor, keep turf managers and scientists from we have employed another technique to
Dr. R. T. Kane, Adjunct Assistant having the answers to all the problems. For assess the types and intensities of diseases
Professor, and Ms. L. Ortiz, Research this very reason, it is important to keep a affecting turf managers in Illinois and
Associate, Dept. of Natural Resources careful eye out each season for what is other midwest states. And then, for exam-
and Environmental Sciences, University developing in your turf. By determining ple, by understanding which diseases are
of Illinois. (See Book/CD Reviews) which problems are increasing in frequen- problems on golf courses or turfgrass sod
cy and severity, and which are declining, fields in contiguous areas, we can alert
we can effectively direct our resources and Illinois turf managers of what to expect.
research time to minimize the impact of We can rapidly diagnose what problems
E
ach year turfs experience prob-
lems, including disease, wear problems, and better prepare you to man- are developing in Illinois. Most important-
from use, insect damage and age turf diseases when they do develop. ly, we can prioritize our time and resources
environmental stress (such as drought, We spend considerable time collecting to address the most pressing turf disease
heat, compaction, suffocation). While the information about what diseases are pre- needs. In particular, this data guides us in
severity of these problems vary from sent each year, where they are observed, preparing lectures, short courses and
season to season, they can generally be and what controls have worked or failed. descriptive articles. For example, this data
expected to develop annually. In the case This information is collected through visits is used to assist in the design and planning
of diseases, which will include nematodes, to turf sites, discussions with turf man- of educational sessions. Another excellent
fungi and bacteria, there are over 100 agers and scientists at meetings, or on the use of this data is for directing and focus-
different types that could reduce the phone. There is a lot of "buzzing" between ing our research activities. If managing
quality of your turf during any given turf pathologists during the season. This is summer patch is the most common prob-
season. Between the two of us, we have very useful for predicting problems before lem for turf managers, we need to under-
spent 24 years studying the diseases that they develop. Fortunately, diseases do not stand this and direct a significant portion of
affect your turf, and we have the dubious all of a sudden appear. Generally, disease our time and energy toward improving your
privilege of discovering eight new turf conditions develop over large areas and ability to manage this disease.
diseases. move along with the prevailing weather
Continued on next puge
How To CUT 22'ROTARY MOWER
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TPI Turf News: November/December 1996 31
THEME OF THE MONTH: AGRONOMICS
Table 1:
What are the most important diseases Thrfgrass Pathology Informational Survey-
that you deal with? Frequency of Score Rating Equalling Number One, 1994.
ILLINOIS-28 turfgrass managers out 70
of 87 ranked dollar spot as the disease that
they deal with most (see Table I). Next,
SUMMARY FOR ALL STATES
60
they ranked summer patch as the second INCLUDED IN SURVEY
most frequently experienced problem.
Also notice that Pythium is ranked higher 50
than a brown patch. This surprised us! We >-
thought brown patch was a more frequent ~ 40
disease than Pythium. UJ
~
MINNESOTA-We gave a presentation CI 30
in Minnesota, which gave us data for that ~
area. As you might expect, snow molds are u... 20
the big problem. However during the
growing season, dollar spot is again the
main problem, followed by brown patch 10
and Pythium. It stands to reason that sum-
mer patch would not be a major concern in o
Minnesota, because it requires stressful RUST OTHER
SP OS SM BP PB LB
conditions in the summer to fully develop.
On the other hand, our data indicates that DISEASE
Minnesota turf managers have a bigger
problem with necrotic ring spot and take- SP=SUMMER PATCH DS=DOLLAR SPOT PB=PYTHIUM BLIGHT
all patch, which were indicated as their SM=SNOW MOLD BP=BROWN PATCH LB=LEAF BLIGHT
Contillued 011 next page 35
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32
TPI Turf News: Novemher/December 1996
THEME OF THE MONTH: AGRONOMICS
"other" problems. Both of these diseases spot, summer patch, Pythium blights and How ahout you opinion? We need
require cool, wet conditions in the spring brown patch are the main diseases for your opinion! Take the time to fill out and
• and fall to be serious problems. which more information or management mail us the survey form below: If you send
options are most needed for superinten- us your information, you arc supporting
OHIO-Yes, we got to the Buckeye dents in Illinois. yourself and your turf operation.
state, and there we found that dollar spot
was again the big problem, but after that, Mail the following information to: H.T. Wilkinson, Oept. of Nat. Res. & Env. Sci.,
brown patch was in second place. Leaf University of Illinois, W-423 Thrner Hall, 1102 S. Goodwin Ave., Urhanu, II. 61801
blights were a solid third and fourth place
was shared by Pythium and summer patch.
r----------------------------,
Thrfgrass Pathology Informational Survey
Collectively, this data tells us that dollar H. R. IVi/killsoll lIlId R. T. KlII/('
spot is the most persistent disease that we
Rank the diseases that you are most concerned about during the growing season.
deal with. No wonder there are more fungi-
(I = most important and 8 = least important).
cides available for dollar spot than for any
other disease. You might wonder if com- Summer Patch Your work area zip code:
mon old dollar spot warrants more research Dollar Spot Turf you manage:
and attention, since it is readily controlled Snow Molds __ golf lawns sod athletic
by sound fertilization and fungicides. I Brown Patch Date: Mo Day __ Yr _
would suggest, however, that the persis-
tence of dollar spot, the immense area of Pythium Blight (Warm season)
turf that it affects and the large amounts of Leaf Blight (Heiminthosporium)
fungicides that are annually applied to con- Rusts Annual Fungicide Budget $ _
trol it are excellent justification for seeking Other _
alternative management strategies. As we
L ~
see the situation based on this data, dollar
Raverty
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vacuum to lift grass for even cut .
./ Bl'Wlb 6N Vac - A 10'"counter-rotating
brush and vacuum sweep turf areas dean of
smalt debris.
.I Finger Sweeper - Replaces tho brush••
rubber (m.
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35
TPI Thrf News: NovemherlDecemher 1996
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