Healthy and Diseased

 

Aster yellows epidemic in various crops and weeds in southwestern Texas.

1. An apparently healthy carrot plant (left) and an infected (right) carrot with symptoms showing extensive shoot proliferation.
2. An aster yellows-infected parsley plant (front) showing virescence and phyllody of flowers and yellowing of leaves.
3. An aster yellows-infected dill plant showing virescence and phyllody of flowers and abnormal elongation of the inflorescence.
4. An apparently healthy (left) and two aster yellows-infected onion plants showing shoot proliferation and yellowing of shoots and stunting of plants.
5. An aster yellows-infected cabbage plant showing purple discoloration of leaves and sprouting at the basal stem.
6. Apparently healthy (left) and aster yellows-infected (right) prickly lettuce plants showing shoot proliferation, virescence of flowers, and yellowing of new shoots.
7. An apparently healthy (left) and an aster yellows-infected (right) lazy daisy plant showing proliferation and yellowing of new shoots.
8. An apparently healthy (left) and an aster yellows-infected false ragweed plant (right) showing proliferation and yellowing of new shoots.

For details see Phytopathology 93: 1369-1377, 2003 pdf (portable document file)

PDF files on this page require the free Adobe Acrobat Reader?. Adobe? also provides free PDF tools for the visually impaired.