10 21 Potted Plant Diseases

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10 21 Potted Plant Diseases

  1. 1. Potted plant diseases Plant: Spider Plant Term: Pot-bound
  2. 2. Spider Plant <ul><li>Genus: Chlorophytum </li></ul><ul><li>Indirect Light </li></ul><ul><li>Keep Evenly Moist </li></ul><ul><li>Tolerates low humidity </li></ul><ul><li>Grows best between 50 -75 </li></ul><ul><li>Scale, spider mites, & whiteflies are problems </li></ul><ul><li>Cut off babies & root them </li></ul>
  3. 3. Pot-bound <ul><li>A condition where the roots have outgrown their container and spiral around until all of the soil is displaced. </li></ul>
  4. 4. Disease and Insects <ul><li>control pests by recognizing and controlling them on the plant </li></ul>
  5. 5. Common plant pests <ul><li>aphids </li></ul><ul><li>white flies </li></ul><ul><li>mealy bugs </li></ul><ul><li>mites </li></ul><ul><li>scale </li></ul>
  6. 6. Aphids <ul><li>small green insects with piercing mouths </li></ul><ul><li>called plant lice </li></ul><ul><li>suck plant juices from the plant </li></ul>
  7. 7. Aphids <ul><li>work on stem and underside of leaves </li></ul><ul><li>leaves become sticky with “honey-dew” </li></ul><ul><li>causes growth of black sooty mold </li></ul>
  8. 8. Aphids <ul><li>leaves curl, disfigure, turn yellow </li></ul><ul><li>use Orthene or insecticidal sopa </li></ul>
  9. 9. White Fly <ul><li>small white, winged, sucking insects </li></ul><ul><li>works on underside of leaves </li></ul>
  10. 10. White Fly <ul><li>heavy egg producers </li></ul><ul><li>infestation can occur quickly </li></ul><ul><li>eggs laid on underside of plant leaves </li></ul>
  11. 11. White Fly <ul><li>cause plant to turn yellow </li></ul><ul><li>have mottled appearance - spotty </li></ul><ul><li>White Flies will leave the plant when the leaves are moved </li></ul>
  12. 12. Mealy Bugs <ul><li>sucking insect </li></ul><ul><li>white , woolly mass, like a ball of cotton </li></ul><ul><li>works on the underside of the leaves </li></ul>
  13. 13. Mealy Bugs <ul><li>sucking juices gives plant a faded yellow appearance </li></ul><ul><li>control by swabbing the insect with a q-tip dipped in alcohol </li></ul><ul><li>removes insect from plant </li></ul>
  14. 14. Mites <ul><li>small spider like insects on bottom side of leaves </li></ul><ul><li>suck juices causing plant to turn yellow </li></ul><ul><li>cannot be seen easily with the naked eye </li></ul>
  15. 15. Mites <ul><li>hold a white piece of paper under leaf and tap the leaves </li></ul><ul><li>look for spider like insects moving on the paper </li></ul>
  16. 16. Mites <ul><li>wipe across the paper with your finger </li></ul><ul><li>if mites are present, there will be a red smear </li></ul><ul><li>control with Kelthane or Orthane </li></ul>
  17. 17. Scale <ul><li>when mature, attack stems in a cluster </li></ul><ul><li>small white gray lumps - oval shape </li></ul><ul><li>plant turns yellow, loses vigor </li></ul>
  18. 18. Scale <ul><li>sticky sap appearance on plant </li></ul><ul><li>remove with soapy water </li></ul><ul><li>spray with Malathion or Orthane </li></ul>
  19. 19. Botrytis <ul><li>common disease </li></ul><ul><li>leaves turn black and develop a gray mold and will eventually rot off </li></ul>
  20. 20. Botrytis <ul><li>provide good air circulation </li></ul><ul><li>use a fungicide - Benlate </li></ul>
  21. 21. Mildew <ul><li>common disease </li></ul><ul><li>leaves get a heavy white coating </li></ul><ul><li>fungicide - Benlate </li></ul>
  22. 22. Insecticides <ul><li>can be purchased in most stores </li></ul><ul><li>read the label for applications and directions </li></ul><ul><li>Insecticidal soaps are the safest and least toxic </li></ul>

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