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NALP Cool Season Turf grasses CH 8 (Managing turf grass diseases) Questions and Answers Fully Solved
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NALP Cool Season Turf grasses CH 8 (Managing turf grass diseases)
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NALP Cool Season Turfgrasses CH 8(Managing turfgrass diseases)
What three things are necessary for disease to develop and turf grass? - answer An
interaction among a susceptible plant, I disease producing organism, in an environment
favorable for disease development.
What is the first step in turf grass disease management? - answer Identifying the true
nature of the problem.
What are symptoms? - answer The expression of the susceptible grass to the disease
that can take on a variety of sizes, shapes, and colors.
What structures of pathogens can normally be seen by the human eye? - answer
Spores, mushrooms, or massive amounts of my mycelium.
What environmental factors can give you information about a disease diagnosis? -
answer Temperature, light intensity, humidity, and precipitation just prior to and during
disease development.
What site characteristics are also important to disease diagnosis? - answerAir
movement, drainage, soil conditions, the amount of sun or shade, slope, and nearest of
other plantings or buildings.
What do you successful disease control practices involved? - answerManipulation of the
environment, the grass, and or the pathogen, to favor the health of the grass and inhibit
the causal fungus.
What are some ways the environment can be altered to better manage disease? -
answerRemoving dew and reducing the amount and/or frequency of irrigation, improved
air movement, drainage, Thatch reduction, reduced shade, property regulation of
fertilizer applications, and good mowing practices.
What grass type choices can be made to reduce disease? - answerSelect and grass
types that are naturally resistant two local disease problems or selecting disease
resistant grass cultivars.
Is it a good idea to use a single species or cultivar of grass for turf establishment or
renovation? Why or why not? - answerNo, it is always preferable to use mixtures of
different grass species or blends of different cultivars. Seeding mixtures and/or blends
produce a diverse population of grass plants. diversity in planting almost always
increases odds of survival.
, Why is it essential to make sure you have properly identified the disease before
applying a fungicide? - answerUsing the wrong fungicide waste money and may involve
the risk of worsening the disease, as well as causing other unwanted side effects.
What are the two broad categories that turf grass fungicides can be divided into? -
answerContact fungicides and systemic fungicides.
How do you contact fungicides generally work? - answerThey are applied to the leaf
and stem surface of turf grasses and do not move appreciably within the plant. They
may be washed or mowed off of the leaf surface. They are only effective for a short
period of time, usually 7 to 14 days, and do not protect new foliage. These fungicides
are usually used for the control of foliar diseases and not diseases of the routes in
crowns. Contact fungicides generally have a broad spectrum of control and have been
used extensively in the turf industry for a number of years.
How do you systemic fungicides work? - answerChemicals that are absorbed and
translocated within the plant. They are not as likely to be removed from plant by rainfall
and mowing. They may protect plants for a period of 2 to 4 weeks and will protect new
growth. Most systemic fungicides can control both foliar and root/crown disease. They
are somewhat prone to resistance.
How can you reduce the possibility of fungal resistance to a specific fungicide? -
answerOnly apply fungicides when absolutely necessary, alternate and mix fungicide
with different modes of action, and use broad-spectrum contact fungicides in place of
systemic fungicides whenever possible.
What time here do we normally see brown patch? - answerSummer.
What courses in turf grasses are most susceptible to brown patch? - answerPerennial
ryegrass and tall fescue, sometimes Kentucky blue grass in mid to late summer during
extended periods of high temperature and humidity.
What are the symptoms of brown patch? - answerPatches are typically circular and
maybe up to 7 feet in diameter. In early morning on dew covered turf, white mycelium of
the casual fungus can often be seen on in between grass leaves and stems in the
patch. Sometimes, all the grass within the patches are killed, creating a sunken affect.
More often, the turf in these patches is thinned rather than completely killed.
Occasionally, no circular pattern can be seen and the disease appears as a diffuse
blight.
Symptoms on leaves appear as irregular tan or light brown lesions surrounded by dark
brown borders. Sometimes, the entire stand me look discolored and thinned.
Describe the disease cycle of brown patch: - answerThe causal fungus over Winters as
tiny resting bodies called sclerotia, either within infected grass tissue or in the soil. The
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