. Bulletin. Natural history; Natural history. 302 Illinois Natural History Survky Bulletin Vol. 26, Art. 3 240 - 200 t 160 z 40 â FUNGUS MATS I I TEMPERATURE F^ PRECIPITATION DEVIATIONS FROM THE ANNUAL MEAN. OCT. NOV. DEC. JAN. FEB. MAR. JUNE JULY Fig. 14.âMonthly mean temperature and total precipitation, both shown as deviations from the annual means, and the numbers of mycelial mats of Endoconidiophora fagacearum found on wilt-killed oak trees in five Illinois study areas, October, 1952, through July, 1953. The bars illustrate the possible influence of monthly temperatures and precipitation
. Bulletin. Natural history; Natural history. 302 Illinois Natural History Survky Bulletin Vol. 26, Art. 3 240 - 200 t 160 z 40 â FUNGUS MATS I I TEMPERATURE F^ PRECIPITATION DEVIATIONS FROM THE ANNUAL MEAN. OCT. NOV. DEC. JAN. FEB. MAR. JUNE JULY Fig. 14.âMonthly mean temperature and total precipitation, both shown as deviations from the annual means, and the numbers of mycelial mats of Endoconidiophora fagacearum found on wilt-killed oak trees in five Illinois study areas, October, 1952, through July, 1953. The bars illustrate the possible influence of monthly temperatures and precipitation on the numbers of mycelial mats of Endoconidiophora fagacearum produced on wilt-killed oaks. For temperature in October and precipitation in May there were no deviations from the means. month on all trees. It can be seen from these figures that mat development was greatly accelerated during April, May, and June. Some of the mats that were found in July were small and dry; many of them consisted only of pad material. They were found by removing bark from the trees. None of these undeveloped mats bore conidia of Endoconidiophora fagacearum. Fig. 14 suggests the influences of monthly temperature and precipitation on mat formation. The average tempera- tures for May and June, respectively 16 and 22 degrees, approached the optimum temperature (about 25 degrees) for growth of the fungus. The maximum temperatures were 32 degrees in May and 40 degrees in June; each of these oc- curred on a day near the end of the re- spective month. Although the average temperature for July was only 24 degrees, a number of days during the month had maximum temperatures of 35 degrees. Thermometer readings showed that the temperature under the bark of wilt-killed oaks in unshaded areas was frequently as high as 40 degrees. During the winter months the highest average temperature for any month was 9 degrees, which is too low for rapid growth of the fungus. The total monthly precipitation for the five st
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