- OHIO STATE UNIVERSITY BUSINESS BINGO SHEET HOW TO
- OHIO STATE UNIVERSITY BUSINESS BINGO SHEET SERIES
Nutritional disorders (example: low iron can cause chlorosis). Analyze damage patterns in plantings (single plant or entire field). Oxygen and moisture extremes (too wet or too dry). Light extremes (too sunny or too shady). Temperature extremes (too hot or too cold). Mechanical factors (example: lawn mower damage to tree). Insects, mites and other animals (symptoms and signs of insect or animal damage, like feeding sites). Pathogens (symptoms and signs of specific diseases). Specifically, look for key diagnostic signs or symptoms that are characteristic of known plant pathogens or insects. Collect as much information as possible to help you develop a solid mental picture of what has led to the damage you are observing. Gather as much information as possible about the plant, such as cultivar or variety, age, recent fertilizer or pesticide applications, cultural practices used, recent weather trends, irrigation practices, any information available about the history of the site, and how the damage progressed over time. Gathe r information and determine cause of plant damage. The more time that passes, the more severe the disease will be.ĥ. Refer to the Disease Progress Curve in Figure 2. The science of how disease develops over time is called epidemiology. In contrast, damage that does not spread and where there are clear lines of delineation separating sick plants from healthy plants, typically indicates damage caused by an abiotic factor. Did it appear suddenly or over time? Has the damage spread or stayed in the same location? Progressive development and spread over time often indicates damage caused by pathogens. Ask questions about how the damage developed. This specifies that the cause was a living factor, like a pathogen or insect.Ĥ. Non-uniform damage patterns are random and only on a few plants. This indicates that a nonliving source was the likely cause, such as mechanical, physical or chemical factors. Uniform damage patterns are over a large area or on several plants. Is only a single plant affected? Is the potential disease restricted to a certain area or single species? Are the symptoms randomly distributed or can you see any distinct patterns or clear lines of differentiation between healthy and affected plants? Using these questions, we can classify these patterns into two categories: uniform or non-uniform. This may be easier said than done, especially when it comes to large specimens like a 50-foot oak tree.ģ. Check out the leaves, stems, roots, fruit and flowers if appropriate. Even then, however, look at the entire plant first before going directly to the sick part of the plant. Once you have done this, focus your attention on the affected plant(s). Take stock in what the entire plant community looks like. Don't jump right into examining the affected individual plant or area. Examine the entire garden, landscape or woodland area. 
Only then can you determine that a problem exists.Ģ. Know your plant hosts and how they change with the seasons. Losing leaves in June is therefore abnormal. For example, in Ohio a maple tree develops fall coloration and begins losing leaves in October. Make sure to take seasonal effects into account. Start by correctly identifying the host plant and becoming familiar with its normal or healthy state and characteristics. Determine that a problem actually exists. (Source: Department of Plant Pathology, The Ohio State University.)ġ. It can be difficult and confusing at times, but the following five-step approach should help simplify the task.įigure 1. Before you can establish what control strategies should be taken, you must first determine the exact culprit and rule out all other possibilities. Proper diagnosis is a critical step in the control of plant diseases.
OHIO STATE UNIVERSITY BUSINESS BINGO SHEET HOW TO
Plant pathology is the study of plant disease including the reasons why plants get sick and how to control or manage healthy plants.
OHIO STATE UNIVERSITY BUSINESS BINGO SHEET SERIES
This is the second fact sheet in a series of ten designed to provide an overview of key concepts in plant pathology.
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