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Colorado Pesticide Exam Turf: Turfgrass diseases Questions and Answers
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Colorado Pesticide Exam Turf: Turfgrass diseases Questions and Answers
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Colorado Pesticide Exam Turf: Turfgrass diseasesQuestions and Answers
Signs of fungal diseases Correct Ans-mushrooms, mycelium, sclerotia
Nematodes Correct Ans-microscopic round worms, multicellular, have complex systems,
reproduce sexually via eggs, feed on roots, breakdown genetic resistance opening way for
other pathogens
Symptoms of nematodes Correct Ans-root galls, poor growth, yellowing, distortions,
stunting
Signs of nematodes Correct Ans-cysts
Parasitic higher plants Correct Ans-true plants that reproduce by seed, most have little or
no chlorophyll so they obtain it by parasitizing other plants, others have chlorophyll but no
roots (water and nutrients from host)
Symptoms expressed by host of parasitic higher plants Correct Ans-stunting, decline,
wilting, yellowing
Abiotic disorders Correct Ans-caused by environmental factors that mimic infectious
diseases and insect damage, many are poorly understood and difficult to diagnose
, Colorado Pesticide Exam Turf: Turfgrass diseases
Questions and Answers
Causes of abiotic disorders Correct Ans-moisture imbalance, nutrient imbalance,
temperature extremes, chemicals, cultural practices
Macronutrient examples Correct Ans-Nitrogen (N), Phosphorous (P), Potassium (K),
Calcium (Ca), Magnesium (Mg), Sulfur (S)
Micronutrient examples Correct Ans-Iron (Fe), Boron (B), Manganese (Mn), Zinc (Zn),
Copper (Cu), Molybdenum (Mb)
How do elements interact with each other to injure the plants? Correct Ans-one element
can interfere with the absorption or utilization of another (high sodium can interfere with Ca
uptake)
How do temperature extremes affect plants? Correct Ans-shutdown of many biochemical
processes within the plant and direct damage to susceptible tissues
Most important and widespread abiotic factor affecting plants Correct Ans-herbicide injury
(phytotoxicity) resulting from misapplication, off-site movement, and contamination of
equipment
Disease triangle Correct Ans-host, pathogen, environmental conditions
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