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ROSE CARE FOR SEPTEMBER
by Florence Taylor, Consulting Rosarian
by Florence Taylor, Consulting Rosarian
LEAF PROBLEMS
We all want the leaves on our roses to be healthy, a deep green, clear without blemishes. However, quite often we have to deal with all kinds of abnormalities such as yellowing, color irregularities, burns, flecks, spots, distortions, holes and other forms of faults. Causes can be from diseases, insects and sometimes the fault of the rosarian:
Yellow leaves - This is one of the most common problems that we experience and there can be several causes.
Old leaves – The most common cause of yellowing leaves is that they are just old, tired leaves that have lost their usefulness and are naturally and gradually dropping off.
Not enough oxygen in the soil – this can be caused by poor drainage or by the soil being too compacted. This becomes critical and visible after a heavy rainfall or excessive watering. Symptoms of oxygen deprivation start as yellowing of the main and lateral veins, progressing to the whole leaf. Eventually the leaf drops off.
Too little water – The leaves turn yellow and are shed to cope with water loss through transpiration. The symptoms of too little water, aside from lack of rain or insufficient watering, also may be caused by root problems. If we apply too much fertilizer and not enough water, the roots are getting burned and the root system is not able to deliver water to the plant. Pesticide toxicity, diseases, insect and mite damage are some of the other causes for unhealthy diseased leaves.
We will continue the rest of this article in next month’s newsletter.
Excerpted from The American Rose, 2002.
A YEAR OF ROSE CARE:
January
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