258 



which the previous year had bent to the gruund with its weight of galls 

 now yielded, after careful search, but five or six scrawny specimens. Not 

 only were the galls few in number, they were very small and produced 

 comparatively few spores. In many cases they consisted only of new 

 growths on the sides of the old galls and occasionally, even the old galls 

 bore a second crop of teleutospores. To what, then, shall w^e attribute 

 this marked decrease in gall production? Certainly not to a deficiency in 

 aecidiospore supply, for we have already seen that the supply of aecidio- 

 spores during the summer of 1900 was unusually large; not, indeed, to 

 any mishap that may have befallen the galls during the winter of 1900 

 and 1901, for upon field trips during October and November, 1900, the 

 general scarcity of the galls was very noticeable. The fact remains, then, 

 that the galls were not formed. To us it seems that the cause is to be 

 found in the weather conditions of the latter part of July, August and 

 early September of 1900. the period during which the large crop of aecidio- 

 spores was ripened and disseminated and when under favorable condi- 

 tions ver.v general infection of the cedars should have occurred. The 

 weather reports for the period indicated are as follows: 



July 24, 1000 Rain 



August 12—15. 1000 Rain 



August 17—18. liiiio Rain 



Only three rains, practically only two, with long period^ of from eigh- 

 teen to thirty days of warm, diy weather between (there was no rain 

 after August IS until Septeml»er 19), with the thermometer averaging 

 about SO degrees F. A comparison of the above with conditions during 

 the same period in 1S99 shows al:)Out one-half the number of rains as oc- 

 curred during the last mentioned time. 



The Roestelia, while not so aljundant during the past summer (1901) 

 as in IIXIO, have still been plentiful enotigh to aid materially in the de- 

 struction of the remaining apple trees of the city and country. The dry 

 weather of the latter part of the past summer (1901) has had its effect 

 on the infection of the cedars. Galls, while present, are not numerous, and 

 a repetition of the ravages of 1900 are not to be expected. Weather con- 

 ditions for this period are as follows: 



July, 1901, no rain; average temperature, 90 degrees F. 



August 14. 1901, rain; average temperature, 80 degrees F. 



August 18. 1901, rain; average temperature, SO degrees F. 



Septemljer 11, 1901, rain; average temperature, 80 degrees F. 



