Control of Disease in Plants

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origins of plant disease, characterisitc identity of plant disease, how plant infection occurs, spread of plant disease, control of plant disease, fire blight, blight of beans, granville wilt, aster yellows, soft rot in plants

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Control of Disease in Plants

  1. 1. Control of Disease b.stev
  2. 2. MOSTLY to small to be visible with the EYE : it is MICROBES that damage plants
  3. 3. 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
  4. 4. HOW infection OCCURS: <ul><li>ENTERS through a WOUND </li></ul><ul><li>Weather </li></ul><ul><li>Nectar glands </li></ul><ul><li>Humans </li></ul><ul><li>Machinery </li></ul><ul><li>Insects </li></ul><ul><li>Leaf scars </li></ul><ul><li>Tools </li></ul>LAB analysis: can identify the specific PATHOGEN
  5. 5. the SPREAD of disease : ALSO – grafting pruning cultivation transportation wind / rain / dust / insects/ mites (Encyclopedia Britannica, 2008)
  6. 6. <ul><li>Seed treatment with hot water 50 o C </li></ul><ul><li>Rotation of crops </li></ul><ul><li>Exclude prone growth if necessary </li></ul><ul><li>Use resistant varieties </li></ul><ul><li>Protective spray/ paint/ drench </li></ul><ul><li>Bio-fungicide use before implantation </li></ul><ul><li>remove & destroy WEED/s </li></ul><ul><li>STERILISE tools (pruning/grafting) </li></ul>CONTROL is DIFFICULT (Encyclopedia Britannica, 2008)
  7. 7. <ul><li>DON’T overcrowd plants </li></ul><ul><li>avoid tissue damage </li></ul><ul><li>KEEP clean grow space </li></ul><ul><li>screen out insects </li></ul><ul><li>AVOID foreign soil use </li></ul><ul><li>refrain working in moist soil </li></ul><ul><li>DON’T graze crops </li></ul>(Growing Edge Magazine, 2006)
  8. 8. SOME common diseases of plants
  9. 9. (Encyclopedia Britannica, 2008)
  10. 10. 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 -

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