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PLANT PATHOLOGY: the study of diseases in plants. Any disease causing agent. PATHOGEN:. Causes of diseases:. Living factors. Non-living factors. LIVING FACTORS ARE INFECTIOUS AND CAN SPREAD FROM PLANT TO PLANT. These include:. fungi. bacteria. virus. insects. nematodes.

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PLANT PATHOLOGY:

the study of diseases in plants

Any disease causing agent

PATHOGEN:

Causes of diseases:

Living factors

Non-living factors


LIVING FACTORS ARE INFECTIOUS AND CAN SPREAD FROM PLANT TO PLANT

These include:

fungi

bacteria

virus

insects

nematodes

rodents, birds, and other animals


Non-living factors do not spread from plant to plant PLANT

These include:

chemicals

physical damage

Nutrient deficiencies


In order to effectively treat a disease it is important to know whether the disease is infectious or non-infectious


FOR DISEASES CAUSED BY LIVING PATHOGENS TO OCCUR THREE CONDITIONS MUST BE MET

1. There must be a susceptible host plant

2. The pathogen must be present (even

though it might not be seen)

3. The environment must be suitable for

the pathogen to grow and thrive

(temperature and humidity are

important factors)


IF THERE IS NO CONDITIONS MUST BE MET

PATHOGEN PRESENT

THERE CANNOT BE A

DISEASE!!!!

when a disease seems to come from

nowhere, it was just hiding until the

conditions became perfect for it to

grow and spread- remember, most

pathogens are microscopic


VOCABULARY TERMS: CONDITIONS MUST BE MET

1) BIOTIC- living

2) ABIOTIC- non-living

3) FUNGUS- a living organism with no chlorophyll that reproduces by spores, not seeds. (examples: molds, yeasts, mushrooms (effects: leaf spot; fruit rot; stem rot;

root rot)

4) BACTERIA- a one celled living organism. Bacteria

have no cell wall and no chlorophyll

(effects: leaf spot; fruit rot; stem rot;

root rot)


VOCABULARY (continued) CONDITIONS MUST BE MET

5) VIRUS- microscopic ; not yet classified as living or non-

living because viruses cannot survive on their

own without a healthy host cell; viruses have an

outer covering made of protein (effects: causes

distorted, and/or stunted, and/or discolored growth

6) VIROID- viroids are smaller than viruses and do

not have the outer protein covering

(effects: same as viruses)

7) NEMATODE- a microscopic roundworm that

usually lives in the soil and

feeds on the roots of a plant

(effects: stunted growth; distorted

roots)


VOCABULARY (continued) CONDITIONS MUST BE MET

PARASITIC SEED PLANT- a true plant

with chlorophyll that attaches to a

host plant and steals the nutrients

from the host plant (effects: causes a

general weakening of the host plant)


REMEMBER: CONDITIONS MUST BE MET

MOST DISEASE THRIVE IN DAMP MOIST ENVIRONMENTS. AVOID OVERWATERING PLANTS AND TRY NOT TO CREATE PUDDLES IN THE GREENHOUSE

THROW GARBAGE (soil, dead leaves, dead plants, etc.) in COMPOST or DUMPSTER- DO NOT THROW ON FLOOR OR LEAVE ON BENCHES

PUT EMPTY USED POTS OUTSIDE


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