Control of Disease

b.stev

MOSTLY to small to be visible with the EYEEYE::

it is MICROBES that it is MICROBES that damagedamage plants plants

4.Tumors- infection overstimulates growth & the multiplication of cells form an abnormally abnormally structured growth

BACTERIABACTERIA disease has 44 characteristic identities:

1.Vascular WILT- infection causes blockageblockage to

the plants H2O & nutrient/s2.NECROSIS – toxin is secreted - growth

canker - leaf spots - stem blight 3.Soft ROT – enzyme/s degrade cell wall,

common in fleshy vegetables: soft & watery

LAB analysis: can identifythe specific PATHOGEN

HOW infection OCCURS:ENTERSENTERS through a WOUNDWOUND

Weather

Nectar glands

Humans

Machinery

Insects

Leaf scars

Tools

the SPREAD of disease:

ALSO – grafting pruning cultivation transportation

windwind/ / rainrain/ / dustdust/ insects/ / insects/ mitesmites

(Encyclopedia Britannica, 2008)

Seed treatment with hot water 50oC

RotationRotation of crops Exclude prone growth if necessary

Use resistant varieties

Protective spray/ paint/ drench

Bio-fungicide use before implantation

remove & destroy WEED/s

STERILISE tools (pruning/grafting)

CONTROL is DIFFICULT

(Encyclopedia Britannica, 2008)

DON’T overcrowd plants

avoid tissue damage

KEEP clean growgrow space

screen out screen out insects

AVOID foreign soil use

refrain working in moist

soil

DON’T graze crops (Growing Edge Magazine, 2006)

SOME common diseases of plants

(Encyclopedia Britannica, 2008)

Bibliography

Wikipedia. (2008). Plant pathology – wikipedia, the free encylopedia. Retrieved September 4, 2008, from http//:www. en.wikipedia.org/wiki/Phytopath ology - 58k

Growing Edge Magazine. (2006). Growing Edge Magazine - 8 steps to control diseases of. Retrieved September 4, 2008, from www.growingedge.com/ magazine/back_issues/view_article.php3?AID=180244 - 25k -

Encyclopedia Britannica. (2008). Plant disease, infectious disease - causing agents – britannica. Retrieved October 4, 2008, from www.britannica. com/EBchecked/topic/463327/plant-disease/63336/Infectious-disease- causing-agents -