the defect is caused by local growth of tree tissues due to various irritations. for example, damage, frost damage, fungi and bact

background bact bacteria ball bark beautiful botany branch buckle builder buy cancer caused cell circle color damage deciduous defect dendritic due english environment example factory foliage forest forestry frost fungi fungus furniture green growth huge illness irritations knotted landscape large leaf local natural oak old outdoor park plant quercus rare robur sphere spring sun sunlight texture tissues tree trunk turbing various veneer wood