RELATION OF WEATHER TO FUNGOUS INFECTIONS. 57 
leaves than the usual drying process followed by the authors. In 
summer and fall, fungus left remaining on leaves, as well as when 
scraped off and kept in bottles, has produced infections as long as 
two months after picking. 
RELATION OF WEATHER CONDITIONS TO FUNGOUS INFECTIONS. 
While it is an established fact that good infections of the red and 
yellow Aschersonias are occasionally secured as early as April and 
May, and as late as early October, experiments have shown that 
weather conditions during these months are too subject to variation 
for even reasonably reliable results. Unless due regard be given to 
existing conditions, more failures than successes follow introduction 
at this season. Considering the difficulty with which fungus can be 
secured so early in the season, the tendency toward unfavorable 
weather conditions, and the better infections secured later in the sea- 
son in return for the same expenditure of time and money, the au- 
thors do not recommend the introduction of fungi before June or, at 
least, until the summer rains begin. All experiments have shown 
that it is useless to force nature; that fungi can not be successfully 
introduced unless the weather conditions are such that the fungi are 
spreading naturally in infected groves. At Orlando this did not 
occur till June in 1907 and 1908, but in 1909 occurred by the middle 
of May. While infections of red and yellow Aschersonias have been 
secured as late as early October during the past three years, it is 
recommended that introductions of these fungi be completed during 
the summer rainy season. Our records show that numerous attempts 
by various means to introduce the brown fungus earlier than the 1st 
of September have frequently been failures, while previous to that 
time the slight infections secured have spread very slowly. 
During the rainy season itself, all experiments to determine just 
what combination of humidity and temperature would give the best 
infections have, as a whole, been thoroughly negative. No difference 
in resulting infections has been observed whether the spore solutions 
were applied on bright, sunny days or on cloudy, muggy days; on 
ordinary days, days with frequent showers, or directly after such 
showers; at various times in the day from 5 a. m. to 6 p. m., with the 
temperature high and the humidity low, or vice versa. 
It would appear that applications have been made under every 
conceivable combination of weather conditions, and from the entire 
mass of experiments nothing can be learned aside from the fact that 
it apparently makes no practical difference at what time of the day 
or under what conditions of humidity, temperature, prevalence of 
showers, etc., the spores are applied, so long as typical Florida sum- 
mer weather prevails. 
