what are the possible reasons for graft incompatibility?
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Graft incompatibility is not clearly understood but may be the result of genetic differences between the grafted parts. Abnormalities may develop in the vascular tissue at the graft union. Disease-causing organisms such as viruses or phytoplasmas are other possible causes of incompatibility.
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1. virus or phytoplasma infection .
2. genetic incompatibility or biochemical reaction of the rootstock and scion .
3. when a weak cultivar is grafted on to an excessively vigorous rootstock .
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