Disease:

1
Plant Pathogenic Mollicutes Phytoplasma

• Disease
• Phytoplasma are present in sap of phloem sieve
  tubes
• Growth regulator production by plant disrupted
  witches brooming
• Phytoplasmas overwinter in infected weed hosts
  and perennial ornamentals
• Black-eyed Susans
• Field daisy
• Thistle
• Wild carrot
• dandelion

2
Transmitted by leafhoppers
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4
Phytoplasma Aster Yellows
Floral parts are replaced by vegetative structures
5
Phytoplasma Aster Yellows on Strawberry
6
Phytoplasma Aster Yellows

• Example of control by application of insecticides
  to control vector
• Timing of insecticide is critical

7
Free branching due to phytoplasma
8
Take-all of wheat
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10
Peach rust
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12
Bacterial blight of rice
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14
Fire blight Erwinia amylovora
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18
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19
Wheat stripe rust
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