Aphid monitoring project update – June 4, 2013

Tuesday, June 4, 2013

As reported in the May 31st update, virus symptoms have been expressing over the last two weeks and I have been asked what the symptoms look like. The picture below is very typical of the symptoms and note that older leaves tend to be a normal green while the newest leaves emerging over the last few weeks are the ones showing the symptoms. These have a generalized chlorosis (yellowing) that is focused more on the leaf margins. Also, these new leaves tend to be stunted and often twisted and misshapen. Other problems (cyclamen mites, herbicide injury, nutritional deficiencies, etc) can cause similar symptoms but if you do see symptoms as described, and shown below, please contact me as soon as possible.
 
Virus symptoms in Mira – spring 2013



 

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