The critical period of growing propagation is during the first three years. There were serious pets infestation. The most dangerous pet is bark borer. Most injured or weak trees were attack by the bark borer regarding water lodging drought or in location that root system was limited. Recent transplanting plants are also susceptible especially propagation plants. The attacked spot is the part of stem where the scion was grafted onto stock plant. It requires 1-3 years to heal the scar. ( Agri. life extension, 2005 ) There were both round head and flateaded borer attacked Mao Luang. The most severe borer found in Mao Luang orchard was emerald bark bowers (Agrilus planipennis).