Work by Natural Resources Wales to replant large areas of woodland felled due to larch disease has been completed at a number of forests.
These include important areas such as the Bwlch Nant yr Arian near Aberystwyth, the Afan Valley near Neath and Wentwood in the Wye Valley.
In the last 18 months, specialists from Natural Resources Wales have planted more than 750,000 trees to restock felled areas affected by the disease.
This is alongside the 3.4 million trees replanted at other woodlands to regenerate the forests after felling for timber production.
Neil Muir, from Natural Resources Wales, said: "Tackling this disease in our larch trees is a difficult task. We are working on a new Welsh Government strategy which aims to slow down the disease by felling in new areas of infection.
"However, there is a positive side to this disease as we have a once in a lifetime opportunity to redesign the forests we manage to make them more resilient to disease and a better place for people and wildlife.
"We also need people who enjoy our forests, like walkers, mountain bikers and families on a day out to take simple steps to help us slow the spread of diseases like this."
It has now been confirmed that infected trees cover more than 6600 hectares of woodland, 5300 hectares of which is on the Welsh Government woodland estate managed by Natural Resources Wales.
Surveys in 2013 found that the disease had spread more quickly than expected after a wet and warm winter created the perfect climate for the spores to travel to other trees.
Natural Resources Wales will be carrying out more surveys in the coming months to assess the extent of areas infected by the disease.
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