. Bulletin. Natural history; Natural history. June, 1955 Curl: Oak Wilt Inocula 301 decline, while the wood was still green and the bark very tight. The other trees had already started to produce mats be- fore they were cut. Tree H-4 did not produce mats at any time. The bark loosened very slowly, and the fungus odor could never be detected in the wood. Tree P-6 did not produce mats until late in March, 1953, 5 months after it had been felled. Thirteen large mats were found on this tree up to May 5, after which no new mats were found. Twenty mats were found on tree R-8 at the time of cutting,
. Bulletin. Natural history; Natural history. June, 1955 Curl: Oak Wilt Inocula 301 decline, while the wood was still green and the bark very tight. The other trees had already started to produce mats be- fore they were cut. Tree H-4 did not produce mats at any time. The bark loosened very slowly, and the fungus odor could never be detected in the wood. Tree P-6 did not produce mats until late in March, 1953, 5 months after it had been felled. Thirteen large mats were found on this tree up to May 5, after which no new mats were found. Twenty mats were found on tree R-8 at the time of cutting, and 14 additional mats appeared over a period of almost 5 months. The last mats to form on this tree were found on March 23, 1953. Tree R-7 had 10 mats when felled and produced only 1 more, which was found on April 21, 1953. Tree R-6 had 7 mats 2 weeks prior to being felled, 23 mats were present at the time of felling, and only 2 developed while the tree lay on the ground, these appearing in the early part of June, 1953. After trees, whether felled or standing, ceased to produce new mats, the fungus sometimes could still be isolated from wood where the characteristic odor per- sisted. Where this odor could no longer be detected, the fungus could not be iso- lated. Stimulation in Mat Production Environmental Conditions.—From the time of the initial appearance of mats on a tree to the time when no further mat development occurred, the number of new mats varied from month to month. As each of the 30 trees used in these stud- ies was examined every 2 weeks, all new mats that had formed since the previous examination were counted and tagged, fig. 13. It is believed that few, if any, mats with cracks* were missed; mats with cracks too small to be seen were located by the bark-tapping method. The data in table 10 show the numbers of new mats found per month on individ- ual trees, the total number of mats found on each tree during the 10-month study period, and the total number found
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