Control of Disease b.stev

MOSTLY to small to be visible with the EYE : it is MICROBES that damage plants

4.Tumors- infection overstimulates growth & the multiplication of cells form an abnormally structured growth BACTERIA disease has 4 characteristic identities : 1.Vascular WILT- infection causes blockage to the plants H 2 O & nutrient/s 2.N ECROSIS – toxin is secreted - growth canker - leaf spots - stem blight 3.Soft ROT – enzyme/s degrade cell wall, common in fleshy vegetables: soft & watery

HOW infection OCCURS: ENTERS through a WOUND Weather Nectar glands Humans Machinery Insects Leaf scars Tools LAB analysis: can identify the specific PATHOGEN

ENTERS through a WOUND

Weather

Nectar glands

Humans

Machinery

Insects

Leaf scars

Tools

the SPREAD of disease : ALSO – grafting pruning cultivation transportation wind / rain / dust / insects/ mites (Encyclopedia Britannica, 2008)

Seed treatment with hot water 50 o C Rotation 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)

Seed treatment with hot water 50 o C

Rotation 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)

DON’T overcrowd plants avoid tissue damage KEEP clean grow space screen out insects AVOID foreign soil use refrain working in moist soil DON’T graze crops (Growing Edge Magazine, 2006)

DON’T overcrowd plants

avoid tissue damage

KEEP clean grow space

screen out insects

AVOID foreign soil use

refrain working in moist soil

DON’T graze crops

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 -