This week’s sample consisted of several detached leaves from a spathe flower plant. Symptoms consisted of chlorotic blotches and some darker flecking on the leaves. One leaf was completely brown but not decayed. The symptoms were not suggestive of a foliar disease, and no fungi were observed on the spots. As a precaution, some leaf pieces were incubated, but nothing grew out.
|Edema on spathe flower (Photo: Mike Munster)|
|Notice red pustules on underside of leaf (Photo: Mike Munster)|
|Edema on geranium (Photo: Mike Munster)|
|Crusty edema on tomato (Photo: Frank Louws)|
|Crusty edema on tomato (Photo: PDIC Database)|
- Avoid irrigating during cool, humid, cloudy weather.
- Reduce humidity in greenhouses by venting and increasing heat, improving air circulation, increasing light intensity, spacing plants further apart.
- Avoid standing water under pots
|Edema on swiss chard, notice the blackened stomata (Photo: Mike Munster)|
|Edema on lilac, similar to fungal leaf spots (Photo: Mike Munster)|
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