Mostly simultaneous discoloration of the whole canopy or dieback of the crown; heavy loss in increment; death of the whole plant without symptoms on above-ground parts; stem base abnormously swollen (sap obstruction); root finally rotten.
Affected tree species
All tree species;
Leaf; Needle; Stem; Shoot/Twig/Branch; Root;
Here, several mistakes during planting are subsumed: insertion into the soil too shallow or too deep; insufficient soil preparation, net around the roots left attached, planting ditches instead of holes combined with heavy soils, abnormal root system (secondary system)following inappropriate planting; the symptoms sometimes appear in the same year following planting, but moreoften (for instance Douglas fir) several years later. Possibilities of errors: other disorders in the root system.
Curative measures Careful planting; sometimes a tree can be saved by a slight pruning of the crown combined with soil melioration.
Inappropriate planting: net not removed
Inappropriate planting: plants inserted into a ditch - roots kinked
Sap obstruction following inappropriate planting
Secondary root system - plant has been inserted too deep into the soil