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HORT 102 Week 13 Notes

by: Irene A.

HORT 102 Week 13 Notes 4616 - HORT 102

Irene A.
GPA 3.5
Intro to Cultivated Plants
Michael Pumphrey

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About this Document

Crop Diseases & life cycles of pathogens; disease management.
Intro to Cultivated Plants
Michael Pumphrey
Class Notes
horticulture, Biology, botany
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This 3 page Class Notes was uploaded by Irene A. on Monday April 6, 2015. The Class Notes belongs to 4616 - HORT 102 at Washington State University taught by Michael Pumphrey in Winter2015. Since its upload, it has received 32 views. For similar materials see Intro to Cultivated Plants in Agricultural & Resource Econ at Washington State University.

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Date Created: 04/06/15
HORT 102 WEEK 13 NOTES Lecture 23 Crop Diseases and Life Cycles of Pathogens I disorder resulting from a diseasecausing factor 0 diseased plant unhealthy condition from continuous irritation by a pathogen O pathogen causal organism 0 symptoms signs of disease 0 Bene cial Effects of Pathogens O aid in decomposition of organic matter amp nutrient recycling 0 symbiotic relationship W plants 0 Detrimental Effects of Pathogens O rob plants of water nutrients photosynthates 0 limit plant growth amp development I destroys chlorophyll reduces rate of photosynthesis I death of plant tissue I disrupt translocation 39 decrease plant growth deerease plant growth 0 reduces plant quality I causes premature ripening of grainfruit grain doesn39t fill completely I disease evidence on leaves owersfruit reduces attractiveness amp quality I replace grainfruit with fungal bodies has toxic effect I seedbome diseases transmitted to next crop 0 indirect harvest losses diseases can cause lodging ear amp fruit dropping leaf loss 0 Pathogens causing infectious diseases I responsible for greatest number of crop losses I rusts smuts stalk rots down mildews I reproduce via spores carried by Wind crop residue seeds I can reproduce sexually adaptovercome genetic resistance enter plant through openings like stomata or wounds single celled organism reproduces via binary fission colonize amp parasitize host symptoms include soft rots leaf spots bacterial galls vascular disease not considered living organisms obligate parasites can only grow amp multiply within a host invade cells amp disrupt functions most common symptom is alteration of leaf chlorophyll pattern microscopic worms roundworms that attach to roots stems leaves owers most feed on roots reproduce via eggs parasitize plant tissue cause galls lesions stuntedinjured roots cause plants to wilt stunts growth Lecture 24 Disease Management factors for disease to occur 0 pathogen O susceptible host 0 proper environment for disease development 0 disease cycle 0 inoculum some form of pathogen is transferred to plant 0 O O host amp pathogen must come into contact of inoculum through natural openings or wounds insects may inject pathogen when feeding fungal pathogens may enter via root tissue occurs when pathogen becomes established in host pathogen begins to multiply within host pathogen spreads throughout plant disease symptoms appear tissues rupture transport system plugged chlorosis amp necrosis occur major economic crop losses spread by wind insects water people animals birds amp of pathogen 0 Epidemic disease outbreak 0 OOO in uenced by both host amp pathogen crop type growth stage degree of susceptibility pathogen39s virulence reproductive potential mobility environmental factors I temperature I humidity I soil moisture I wind cultural practices I planting times I pruning I moisture control 0 Methods of Disease Control 0 O O I avoidance morphological structures that hinder pathogen penetration I sunken stomata thick cuticles I tolerance plant can withstand invasion ifwhen it occurs I true resistance infection does not occur despite inoculation I altering life cycle of host plant or pathogen I crop rotation to change host I changing planting date I best management practices to promote vigorous crop growth 0 healthy plants are less susceptible to disease I controlling weeds to eliminate alternate hosts I effective but expensive I used with high value crops I applied before inoculation I often reapplied I seed treatments protect seedlings from root disease andor insects


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