Summary ... 'This publication sets out short-term results from eleven experiments measuring responses to controlled burning in girth growth of pole-sized trees and crown damage to saplings. The experimental results were divided into the trees species, tree sizes, and intensity of the treatment fires. Fire intensity was described by Byram's formula I = Hwr. The experiments included four species, jarrah, karri, maritime pine and monterey pine, all of which are subjected to varying amounts of controlled burning in Western Australia. The fire intensities were within the limits normally used for controlled burning. For pole sizes they ranged from 13 to 27 B.T.U. per second per foot for jarrah, 22 to 29 for karri, 9 to 11 for maritime pine, and 4 to 5 for monterey pine. These fires failed to produce responses in girth growth over two- to four-year measurement periods. One experiment included treatment with intense fires for jarrah poles. Twenty per cent. of these trees were killed in spring and 27 per cent. in autumn. Most of the remainder developed 'dry-sides' and the area of this damage was related to bark thickness. Damage from the intense fires contrasted with the controlled-burnt poles where only one in 253 trees was killed, and there was little or no evidene of butt damage to the remainder. Subsequent girth growth of trees in the intense fire treatments was similar to the unburnt control trees. Small jarrah and karri saplins were susceptible to crown damage during controlled burning. Jarrah saplings less than nine feet (2.7m). high were damaged by 9 to 12 B.T.U. per second per foot, and saplings up to 13 feet (4m). high were damaged by 25 B.T.U. Karri saplings less than 19 feet (5.8m). high were killed by 20 to 30 B.T.U. but saplings 30 feet (9.1m.) high withstood 12 B.T.U. without butt damage or loss in girth growth. Controlled burning under pole-sized pines failed to produce responses in girth growth, but marked responses after intense fires which scorched the crowns. These responses were related to the length of green tip above the scorched crown.'