i. An outward symptom of internal disease: red-rot 

 fungus, Fomes annosus, on Scots pine. 2. Sulphur-tuft 

 fungus, Polyporus sulphureus, on oak. 3. Larva of saw- 

 fly, Lophyrus pini, attacking young pine shoots. 4. Yew 

 forest on Surrey chalk hills. 5. Wood of Scots pine grow- 



ing in Surrey. 6. Horntail wasp, Sirex gigas,\vthose grub 

 spends several years mining the solid wood. 7. Self-sown 

 pine wood on a Surrey heath. 8. A Surrey beech wood. 

 9. Neglected oak trees, Quercus robur, with much wood 

 but yielding little serviceable timber 



FORESTRY: BRITISH FOREST TREES AND SOME PESTS WHICH THREATEN THEIR GROWTH 



