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Vegetable Disease Update:
Powdery Mildew. Powdery mildew,
caused by the fungus Sphaerotheca fuliginae, is in almost all pumpkin
fields in Illinois. Since the season is rapidly coming to the end, control
powdery mildew is no longer needed. However, if there are many late fruit
set and the fruit are expected to ripe in October, and the foliage is
still green, one or two sprays during September could be beneficial. At
this time spraying the field with either Nova plus copper or Procure plus
copper could provide control of powdery mildew and bacterial spot, which
both of them have already observed in the fields. For more information
on powdery mildew of pumpkin, click here.
Bacterial Spot of Pumpkin. During
the past week, I observed bacterial spot disease in several jack-o-lantern
pumpkin fields in central Illinois. In most of the fields that I visited,
2 to 5% of fruit were with bacterial spot symptoms. However, in one field,
more than 30% of fruit were infected with this disease. For more information
on bacterial spots of pumpkin, click here.
Plectosporium Blight (Microdochium Blight) of Pumpkin.
During the past week, I observed Plectosporium blight (formerly Microdochium
blight) in some of pumpkin fields in central Illinois. Less than 5% of
the fruit were estimated to be infected. No serious yield losses to Plectosporium
blight are expected in the fields visited. For more information on Plectosporium
blight click here.
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