plant diseases

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  1. Sign of Chlorosis and cause:
    • 1.Yellowing of plant tissue
    • 2.due to limitations on chlorophyll synthesis
    • 3.seen on entire plant, partial leaf, or vein.
  2. Sign of Necrosis
    • 1. death of plant tissue
    • sometimes in spots
  3. Accumulation of anthocyanin
    resulting in a purple or reddish color.
  4. 5 types of deficiency or toxicity symptoms of plants are?
    • 1. chlorosis
    • 2. necrosis
    • 3. accumulation of anthocyanin
    • 4. lack of new growth
    • 5. stunting or reduced growth
  5. Nitrogen deficiency looks like . . .
    light green to yellow leaves, older leaves especially, stunted growth; poor fruit development
  6. Nitrogen excess looks like . . .
    dark green foliage which may be susceptible to lodging, drought, disease and insect invasion.
  7. Phosphorus deficiency looks like . . .
    leaves may develop a wide range of coloration including dull green, yellow, or purple. stunted plant growth and delay in plant development.
  8. Phosphorus excess looks like . . .
    excess phosphorus may case micronuturent deficiencies especially iron or zinc.
  9. Potassium deficiency looks like . . .
    variable among species. usually short, yellowing (sometimes purple) and necrosis.
  10. Potassium excess looks like . . .
    excess potassium may case deficiencies in magnesium and possibly calcium.
  11. Calcium deficiency looks like . . .
    reduced growth or death of growing tips (shoot and root)
  12. Calcium excess looks like . . .
    excess calcium may cause deficiency in either magnesium or potassium.
  13. Magnesium deficiency looks like . . .
    Initial yellowing of older leaves between leaf veins spreading to younger leaves.
  14. Magnesium excess looks like . . .
    high concentration tolerated in plant; however, an imbalance with calcium and potassium may reduce growth.
  15. Sulfur deficiency looks like . . .
    initial yellowing of young leaves spreading to whole plant; similar symptoms to nitrogen deficiency but occurs on new growth.
  16. sulfur excess looks like . . .
    excess of sulfur may cause premature dropping of leaves.
  17. Iron deficiency looks like . . .
    initial distinct yellow or white areas between veins of young leaves leading to spots of dead leaf tissue
  18. Iron excess looks like . . .
    possible bronzing of leaves with tiny brown spots
  19. Manganese deficiency looks likeĀ  . . .
    interveinal yellowing or mottling of young leaves
  20. Manganese excess looks like . . .
    older leaves have brown spots surrounded by a chlorotic circle or zone.
  21. zinc deficiency looks like . . .
    interveinal yellowing on young leaves; reduced leaf size
  22. zinc excess looks like . . .
    excess zinc may cause iron deficiency in some plants
  23. Boron deficiency looks like . . .
    death of growing points and deformation of leaves with areas of discoloration.
  24. Boron excess looks like . . .
    leaf tips become yellow followed by necrosis. leaves get a scorched appearance and later fall off.
Card Set:
plant diseases
2013-01-23 03:07:48
plant care disease causes

nutrient deficiency or toxicity
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