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Download Homework #332 Plant Pathology - Colorado State University
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Transcript
Colorado Master Gardenersm Program Colorado Gardener Certificate Training Colorado State University Extension Homework #332 Plant Pathology Answer the following questions 1. What is the difference between a sign and symptom? A symptom is the plant’s response to a causal agent whereas a sign is the actual organism. 2. Explain the disease triangle. The vertices of the triangle are host, causal agent, environment and time. Without one of these vertices present in the system, disease will not occur. 3. What is the difference between biotic and abiotic causal agents? Biotic causal agents are infectious, transmissible and display a random symptomatic pattern. Abiotic causal agents are non-infectious, non-transmissible, and display a uniform symptomatic pattern. 4. Leaf spots are a symptom of only fungal infection not bacterial infection. T or F False 5. Weed control could help suppress disease control in the garden. T or F True 6. How are viruses transmitted? Viruses are transmitted by insects, nematodes, pruning tools, and vegetative propagation. 7. How can some abiotic disorders relate to improper water management? Overwatering and underwatering cause root death. 332-1 8. Chemical injury to plants can be caused by what? Chemical injury to plants can be caused by fertilizers, pesticides, or de-icing salts and other products. 9. What abiotic disease symptoms mimic biotic disease symptoms? Chemical injury may mimic eriophyid mites, viruses and/or phytoplasmas. Weather induced injury may mimic bacterial or fungal infections, and/or borer activity. 10. What is the first step in the diagnostic process? Identify the plant 332-2