Plant Science 1024
Plant Science 1024 AGPS 1024-001
Arkansas Tech University
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AGBU 2063 - 001
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This 3 page Class Notes was uploaded by Emily Geels on Sunday April 10, 2016. The Class Notes belongs to AGPS 1024-001 at Arkansas Tech University taught by Dr. Collins in Spring 2016. Since its upload, it has received 19 views. For similar materials see Principles of plant science in Agriculture and Forestry at Arkansas Tech University.
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Date Created: 04/10/16
Plant Science 1024 with Dr. Collins Test #4 Material I. Competition between Crops and Pathogens A. Any horticulturist will face three big problems: 1. Insects 2. Disease 3. Weeds B. The control of pests require three basic steps: 1. Recognize the existence of a problem 2. Recognize the pest presence quickly and identify 3. Determine how to control the problem C. Plant diseases 1. Study of plant disease is pathology 2. A plant disease is any abnormality of the plant, of its parts/products, that will reduce its economic value or aesthetic quality 3. Plant disease is a changing dynamic process 4. Nearly all diseases will affect some part of the physiology of the plant a. Respiratory disease b. Photosynthesis c. Absorption (root disease) d. Translocation e. Storage (root/tuber disease) f. Production (flower disease) g. Assimilation (cells) 5. Literal meaning of pathology is the study of the suffering plant 6. Two main causes of plant diseases: a. Infectious disease (biotic)- made up of LIVING agents that CAN be transmitted from a sick plant to a healthy plant 1. Fungi 2. Bacteria 3. Virus b. Non-infectious disease- made up of NON-LIVING agents that CANNOT be transmitted... 1. Weather 2. Mechanical injury 3. Pesticide drift 4. Atmosphere pollutants 7. Symptoms of plant disease a. Evidences that we can detect a plant disease b. Detected by the senses c. Two categories of symptoms: 1. Morphological - Growth related - stunting 2. histological - cellular related - wilting d. examples of symptoms 1. abnormal coloration - albinism - chlorosis (yellowing) - anthocyanins (reddening) - mosaic/ mottling 2. wilting 3. necrosis 4. dwarfing/ stunting 5. abnormal defoliation 6. galling 7. other 8. disease triangle- for any disease to occur, three interdependent factors must come together take away one= stop of disease 9. an infection is the establishment of the pathogen INSIDE the host plant an infestation is external only D. Weeds 1. A plant out of place, growing where unwanted 2. Examples a. Crabgrass in flowerbed b. Trees in a field c. Peanut in a vegetable garden 3. Weeds can be a. Trees b. Grasses c. Brood leaf plants d. Big aquatic leaves 4. Six specific cost-wise damages a. Lower crop/animal yield 1. Toxic weed (buttercup) 2. Competing with crop for nutrients b. Less efficient use of land 1. Cultivation cost higher 2. Harvest cost higher 3. Lower land value c. Higher insect control cost d. Poorer quality product 1. Contaminate seed plot e. Water management problems 1. Block waterways 2. Odor/flavor f. Lower human efficiency
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