Oriental chestnut gall wasp (Dryocosmus kuriphilus) is an insect which causes abnormal growths (galls) on sweet chestnut trees. In summer (June-July), the insect lays eggs in the buds, leaves and petioles of chestnut shoots. Adult wasps emerge from galls, locate new chestnut shoots and lay eggs that will hatch into the next generation. The galls cause leaf distortion, suppress shoot elongation and reduce nut production.

Forest fire risk workshop 3: Disseminating the risk management plan

Chestnut gall wasp risk workshop 2: Evaluating the risk management plan

25 January 2019 in Bragança (Portugal)

Minutes (PT)

Economic assessment report

Chestnut gall wasp risk workshop 1: State-of-the art knowledge, prevention, monitoring and control systems

19 October 2017 in Vila Real (Portugal)

This workshop is part of the series of transnational training workshops organised by the PLURIFOR project. Transnational training workshops aim to exchange know-how about forest risk management between partners and associated partners of the project.





Regional reports

Reports describing how the chestnut gall wasp risk was managed in the concerned regions at the beginning of the project, in 2016:

Summary report

Report summarising the management of the eight risks in the concerned regions at the beginning of the project, in 2016:


  • Portugal: Edmundo Sousa (INIAV) – edmundo.sousa @ iniav.pt – coordinator
  • Castilla y León: Jorge Casado (TRAGSA) – jcaa @ tragsa.es