Final diagnosis


Chrysanthemum foliar nematode, Checkered leaf disease (Aphelenchoides ritzemabosi)

When the spots are numerous, the lamina turns yellow and has the appearance of a checkerboard, a symptom that provides the name for the disease. <i><b>Aphelenchoides ritzemabosi</b></i> (checkered leaf disease)
A chlorotic Virginia tobacco leaf with several contiguous spots, limited by the veins, the light green colour contrasts with the rest of the lamina. <i><b>Aphelenchoides ritzemabosi </b></i>(checkered leaf disease)
Large black polygonal spots between the veins. <i>Aphelenchoides ritzemabosi</i> (checkered leaf disease)
A Virginia tobacco leaf with more or less evolved spots; yellowish to light green at first, then become necrotic and turn brown to black, always located in between the veins. <i><b>Aphelenchoides ritzemabosi</i></b> (checkered leaf disease)
When dissecting damaged tissues, one can observe several foliar nematodes. <i><b>Aphelenchoides ritzemabosi</b></i> (checkered leaf disease)