. Bulletin. Natural history; Natural history. June, 1955 Curl: Oak Wilt Ixocula 289 of three sides of each mat from the edge of the central pad to the periphery of my- celial growth. Each group of three disks was placed in a 10-ml. water blank and thoroughly crushed and shaken. The number of conidia in 1 ml. of suspension was then estimated, and the spores were germinated on water agar. The average number and per cent of germination of spores from each three-disk sampling were compared with the number and per cent of germination of conidia from other three-disk samplings on the same mat. The a
. Bulletin. Natural history; Natural history. June, 1955 Curl: Oak Wilt Ixocula 289 of three sides of each mat from the edge of the central pad to the periphery of my- celial growth. Each group of three disks was placed in a 10-ml. water blank and thoroughly crushed and shaken. The number of conidia in 1 ml. of suspension was then estimated, and the spores were germinated on water agar. The average number and per cent of germination of spores from each three-disk sampling were compared with the number and per cent of germination of conidia from other three-disk samplings on the same mat. The approximate number of spores found on the four mats ranged on differ- ent mats from 280,000 to 1,300,000 in 1 ml. of suspension, and the germination rate ranged from 13 to 41 per cent. In no case was the difference in the average number of spores between any two sam- plings of the same mat greater than 40,- 000, and the difference in germination rate did not exceed 5 per cent. It seems unlikely that such differences would be significant. Therefore, it is believed that representative samples were obtained by the method employed in these studies. Transporting Samples As it was necessary to store collected samples of the fungus at low tempera- .\J y^. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Illinois. Natural History Survey Division. Urbana, State of Illinois, Dept. of Registration and Education, Natural History Survey Division
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Keywords: ., booka, bookcentury1900, bookdecade1910, booksubjectnaturalhistory
