diseases - havelock agricultural...
TRANSCRIPT
![Page 1: Diseases - Havelock Agricultural Educationhavelockag.weebly.com/uploads/1/3/3/7/13374424/diseases.pdfhorticulture plant diseases worse . Disease • Prevention through sanitation and](https://reader035.vdocument.in/reader035/viewer/2022081605/5ad8f3177f8b9af9068e2ce1/html5/thumbnails/1.jpg)
Diseases
Help me! I’m dying.
![Page 2: Diseases - Havelock Agricultural Educationhavelockag.weebly.com/uploads/1/3/3/7/13374424/diseases.pdfhorticulture plant diseases worse . Disease • Prevention through sanitation and](https://reader035.vdocument.in/reader035/viewer/2022081605/5ad8f3177f8b9af9068e2ce1/html5/thumbnails/2.jpg)
Disease
• Disease is a plant disorder caused by an
infectious pathogen or agent
![Page 3: Diseases - Havelock Agricultural Educationhavelockag.weebly.com/uploads/1/3/3/7/13374424/diseases.pdfhorticulture plant diseases worse . Disease • Prevention through sanitation and](https://reader035.vdocument.in/reader035/viewer/2022081605/5ad8f3177f8b9af9068e2ce1/html5/thumbnails/3.jpg)
Groups of pathogens
• Bacteria
– Single-celled organism
– Must remain in host or
under debris
– Actively divide to spread
• Fungi
– Multi-cellular
– Eats on plants and hurts
them in the process
– Produces spores that
spread
• Viruses
– Ultramicroscopic parisites
– Attack plant tissues
– Should destroy plant
completely if found
• Parasitic plants-
– A plant that attaches to
another plant
– Ex. mistletoe, dodder,
lichens
![Page 4: Diseases - Havelock Agricultural Educationhavelockag.weebly.com/uploads/1/3/3/7/13374424/diseases.pdfhorticulture plant diseases worse . Disease • Prevention through sanitation and](https://reader035.vdocument.in/reader035/viewer/2022081605/5ad8f3177f8b9af9068e2ce1/html5/thumbnails/4.jpg)
Plant Disease
• Must be identified
before they can be
treated
• Warm temperatures
and moist conditions
in greenhouse plant
production make most
horticulture plant
diseases worse
![Page 5: Diseases - Havelock Agricultural Educationhavelockag.weebly.com/uploads/1/3/3/7/13374424/diseases.pdfhorticulture plant diseases worse . Disease • Prevention through sanitation and](https://reader035.vdocument.in/reader035/viewer/2022081605/5ad8f3177f8b9af9068e2ce1/html5/thumbnails/5.jpg)
Disease
• Prevention through
sanitation and insect
control is much easier
than treating the
disease.
![Page 6: Diseases - Havelock Agricultural Educationhavelockag.weebly.com/uploads/1/3/3/7/13374424/diseases.pdfhorticulture plant diseases worse . Disease • Prevention through sanitation and](https://reader035.vdocument.in/reader035/viewer/2022081605/5ad8f3177f8b9af9068e2ce1/html5/thumbnails/6.jpg)
Diseases
• Blight
• Canker
• Damping off
• Galls
• Leaf spot
• Mildew
• Mosaic
• Rots
• Rust
• Smut
• Wilt
• Chlorosis
![Page 7: Diseases - Havelock Agricultural Educationhavelockag.weebly.com/uploads/1/3/3/7/13374424/diseases.pdfhorticulture plant diseases worse . Disease • Prevention through sanitation and](https://reader035.vdocument.in/reader035/viewer/2022081605/5ad8f3177f8b9af9068e2ce1/html5/thumbnails/7.jpg)
Blight
• Infectious bacterium
• Cause plant to quickly
turn brown or black as if
they had been burned
• One specific blight is fire
blight-devastating apple
crops
• Prune 6-8” below
infection
![Page 8: Diseases - Havelock Agricultural Educationhavelockag.weebly.com/uploads/1/3/3/7/13374424/diseases.pdfhorticulture plant diseases worse . Disease • Prevention through sanitation and](https://reader035.vdocument.in/reader035/viewer/2022081605/5ad8f3177f8b9af9068e2ce1/html5/thumbnails/8.jpg)
Chlorosis
• Normally green tissue
is pale, yellow, or
bleached. It results
from failure of
chlorophyll to develop
because of infection
by a virus
• Happens from
fertilizer, cold
weather, water, etc
![Page 9: Diseases - Havelock Agricultural Educationhavelockag.weebly.com/uploads/1/3/3/7/13374424/diseases.pdfhorticulture plant diseases worse . Disease • Prevention through sanitation and](https://reader035.vdocument.in/reader035/viewer/2022081605/5ad8f3177f8b9af9068e2ce1/html5/thumbnails/9.jpg)
Canker
• Bacterial disease
• Causes open wounds
on woody plant stems
![Page 10: Diseases - Havelock Agricultural Educationhavelockag.weebly.com/uploads/1/3/3/7/13374424/diseases.pdfhorticulture plant diseases worse . Disease • Prevention through sanitation and](https://reader035.vdocument.in/reader035/viewer/2022081605/5ad8f3177f8b9af9068e2ce1/html5/thumbnails/10.jpg)
Damping off
• Fungal disease
• Causes young plants
and seedling to rot
off at soil level
• Need clean containers
and soil and plenty of
air circulation between
plants
![Page 11: Diseases - Havelock Agricultural Educationhavelockag.weebly.com/uploads/1/3/3/7/13374424/diseases.pdfhorticulture plant diseases worse . Disease • Prevention through sanitation and](https://reader035.vdocument.in/reader035/viewer/2022081605/5ad8f3177f8b9af9068e2ce1/html5/thumbnails/11.jpg)
Galls
• Round swelling or
growths on plants
• Usually caused by an
insect that vectors the
disease
![Page 12: Diseases - Havelock Agricultural Educationhavelockag.weebly.com/uploads/1/3/3/7/13374424/diseases.pdfhorticulture plant diseases worse . Disease • Prevention through sanitation and](https://reader035.vdocument.in/reader035/viewer/2022081605/5ad8f3177f8b9af9068e2ce1/html5/thumbnails/12.jpg)
Leaf spot
• Rings of different
shades of brown,
green, or yellow
• Looks like dots or
circles
![Page 13: Diseases - Havelock Agricultural Educationhavelockag.weebly.com/uploads/1/3/3/7/13374424/diseases.pdfhorticulture plant diseases worse . Disease • Prevention through sanitation and](https://reader035.vdocument.in/reader035/viewer/2022081605/5ad8f3177f8b9af9068e2ce1/html5/thumbnails/13.jpg)
Mildew
• Fungus
• Grows on leaf surfaces
• Appears as white, gray or
purple spots
• Example is powdery
mildew
• Homemade remedy= 2 tsp
baking soda +
horticultural oil with 1 gal
water
![Page 14: Diseases - Havelock Agricultural Educationhavelockag.weebly.com/uploads/1/3/3/7/13374424/diseases.pdfhorticulture plant diseases worse . Disease • Prevention through sanitation and](https://reader035.vdocument.in/reader035/viewer/2022081605/5ad8f3177f8b9af9068e2ce1/html5/thumbnails/14.jpg)
Tobacco Mosaic & Mosiac
• Caused by a virus
• Leaves have irregular
mottled areas with
patterns
• Ranges from dark
green to light green to
yellow to white
![Page 15: Diseases - Havelock Agricultural Educationhavelockag.weebly.com/uploads/1/3/3/7/13374424/diseases.pdfhorticulture plant diseases worse . Disease • Prevention through sanitation and](https://reader035.vdocument.in/reader035/viewer/2022081605/5ad8f3177f8b9af9068e2ce1/html5/thumbnails/15.jpg)
Rots
• Fungus
• Causes plants to decay
and die
• Usually has a unique
smell
• Improve drainage for
the plant to prevent
![Page 16: Diseases - Havelock Agricultural Educationhavelockag.weebly.com/uploads/1/3/3/7/13374424/diseases.pdfhorticulture plant diseases worse . Disease • Prevention through sanitation and](https://reader035.vdocument.in/reader035/viewer/2022081605/5ad8f3177f8b9af9068e2ce1/html5/thumbnails/16.jpg)
Rust
• Fungus
• Causes small spots on
leaves
• Resembles yellow,
orange, brown or red
rust
• Mainly on
underneath of leaf
![Page 17: Diseases - Havelock Agricultural Educationhavelockag.weebly.com/uploads/1/3/3/7/13374424/diseases.pdfhorticulture plant diseases worse . Disease • Prevention through sanitation and](https://reader035.vdocument.in/reader035/viewer/2022081605/5ad8f3177f8b9af9068e2ce1/html5/thumbnails/17.jpg)
Smut
• Black powdery
disease
• Causes blisters that
burst open
• Releases black spores
• Grows on aphid’s
honeydew
![Page 18: Diseases - Havelock Agricultural Educationhavelockag.weebly.com/uploads/1/3/3/7/13374424/diseases.pdfhorticulture plant diseases worse . Disease • Prevention through sanitation and](https://reader035.vdocument.in/reader035/viewer/2022081605/5ad8f3177f8b9af9068e2ce1/html5/thumbnails/18.jpg)
Wilt
• Fungus
• Disease that blocks
the uptake of water
in plants stems
• Causes plants to look
constantly wilted even
when adequately
watered