Nid yw plâu a chlefydau coed yn cydnabod unrhyw ffin, felly mae’n rhaid seilio unrhyw ymateb ar wyddoniaeth gadarn er mwyn cael digon o dystiolaeth i ddatblygu strategaeth hirdymor i ddileu neu reoli’r clefydau hyn ar draws Prydain.
Pests and diseases of trees do not recognise borders therefore any response has to be based on good science in order to provide the evidence for the development of long term eradication or a management strategy across Great Britain.