Mar. 15. 191S Dissemination of Chestnut-Blight Fungus 



501 



Table II. — Detailed record of all exposure plates in which spores of Endothia parasitica 

 were caught at West Chester, Pa., in IQ13 — Continued 



Plate 

 No. 



4772 

 4784 



4787 

 4788 

 4789 

 4790 

 4791 

 4792 



4793 

 4795 

 4796 



4797 

 5006 

 5010 

 5018 

 5020 

 5027 

 5°29 

 5033 

 5°37 

 5°4i 

 5042 



5043 

 5044 



5°45 

 5046 



5047 

 5048 



5049 

 5050 

 5°5i 

 5052 

 5053 

 5069 

 5070 

 5071 

 5072 

 5073 

 5074 

 5075 

 5087 

 5098 

 5102 



Date of exposure. 



Sept. 17. 



....do... 



Sept. 18. 



....do... 

 do... 



....do... 



....do... 



do... 



do... 



do... 



do.. 



do... 



do.. 



do.. 



vSept. 19. 



do.. 



do... 



do.. 



do.., 



do... 



Sept. 20. 



do.. 



do... 



do.. 



do.. 



do.. 



....do... 



....do... 



....do... 



...do... 



....do... 

 ...do... 



....do... 



Sept. 21. 



do. . 



do... 



do.. 



do.. 



do.. 



do.. 



do.. 



Sept. 22. 

 do.. 



Rainfall 



Inches. 

 0.095 



09s 



26 



26 



26 



26 



26 



26 



26 



26 



26 



26 



26 



26 



68 

 68 

 68 

 68 

 68 

 68 

 09 

 09 

 09 

 09 

 09 

 09 

 09 

 09 

 09 

 09 

 09 

 09 

 09 

 35 

 35 

 08 

 08 

 08 

 08 

 08 

 07 

 73 

 73 



Time elapsed 

 since cessation 

 of rain. 



O 

 o 

 I 



I 



2 

 2 

 2 



2 

 2 



3 

 3 

 3 

 9 

 II 

 I 

 2 

 6 



7 



10 

 12 

 I 

 2 

 2 

 2 

 2 

 2 

 2 

 2 

 3 

 3 

 3 

 4 

 5 



SI 



54 



o 



19 



35 

 48 



54 



25 



34 



58 



14 



19 



23 



7 



4 



8 



5 

 7 



55 



o 



I 



8 



19 



23 



25 



45 



12 



37 

 45 

 29 



14 

 o 



5 

 IS 

 17 

 44 

 56 



I 



20 



O 



30 



Length of 

 exposure. 



Minutes, 

 10 



loK 

 9J< 

 10 

 10 



13 



II 



II 



12 



II 



II 



loX 



13K 



II 



iiX 

 I2K 

 11;^ 



I2K 



13K 

 16 



13 



14 



I2K 



I2X 



15 



15 



u'A 



iiX 



13 



ibK 



10 



13K 



WA 



loK 



20 



19 



13K 

 15X 

 12 



14K 

 16 



IS 



Horizontal 



distance to 



nearest 



blight 



lesion. 



Feel. 



"2^ 



a 2 



WA 

 16 



4K 



II 



7 

 ISK 



"aA 

 ^sA 

 ^lA 

 16 



Oi 



02 



4K 



27 



«2 



"5 



"S 



27 



217 



195 

 no 



27 



85 



180 



237 



7 



II 

 II 

 86 



4K 



5 



19 



17K 

 i7>^ 



^9 . 



17K 



14 



7 



19 

 77 



iK 



Niunber of 



spores of 



Endothia 



parasitica 



caught. 



II 

 16 



9 



4 

 5 

 2 



2 

 2 



I 



10 



7 



4 



22 



II 



7 



10 

 6 



7 

 3 

 I 

 I 

 I 



12 

 20 

 62 

 24 

 19 

 I 

 2 



20 

 I 

 I 



"> stumps more or less overhung by diseased sprouts. >> From fragments of bark. <■ Approximately. 



To supplement the tables, it may be well to give in chronological order 

 a more detailed record of the actual routine pursued. 



A rain occurred the night previous to August 19, and examination of 

 the ascospore traps (see "Ascospore-trap tests") showed that abundant 

 expulsion of ascospores had occurred. But when the first plates were 

 exposed too long a time had evidently intervened since the rain, as no 

 positive results were obtained, except that one colony of Endothia para- 

 sitica developed in a plate exposed in the early afternoon. 



