Unevenness in tobacco seedlings

There have been some reports of uneven stands in tobacco greenhouses this year.  In these cases, germination was uniform and the unevenness appeared as the plants developed.  The unevenness presents as differences in plant vigour, with some seedlings being much slower to develop, leading to very different plant sizes within the same variety.  In some cases, the smaller plants may have deformed leaves.  As of today, the cause of this year’s unevenness has not been determined.  To date, the unevenness has not been associated with a disease, so fungicide sprays would not be beneficial.  In tray greenhouses, it may be beneficial to begin clipping earlier and more frequently than normal in an effort to allow the later developing seedlings an opportunity to acquire more growth and thus help to improve the size uniformity of the plants.

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