Posts Tagged ‘Narrow Brown Leaf Spot’

Rice Stink Bugs, Narrow Brown Leaf Spot, Cercospora, Panicle Blight

June 23, 2010

Yesterday we found lots of rice stink bugs in one of our verification fields.  Other folks out checking headed rice said they are finding them too.  If rice is headed they should be checked for stink bugs by sweeping with an insect sweep net.  We had more than one insect per sweep which is more than 3 times the threshold value.

We also found Narrow Brown Leaf Spot which is caused by Cercospora janseana.  At least two varieties were involed, CL161 and CL151.  Because of the confusion with Brown Spot the disease has been commonly called Cercospora to differentiate the two.  It requires propiconazole containing fungicides to control it.

In this heat we are also setting up for an outbreak of Bacterial Panicle Blight which will not be evident until grain development begins.

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