10 
fruit is set it can be brought through to ripening free from fungous 
infection by spraying at certain intervals, but that spraying is of 
little or no value in controlling the blossom-blight form of the disease 
and that profitable sets of fruit can be expected only during seasons 
which are dry at blooming time, unless varieties which are resistant 
to the disease are developed and cultivated. Spraying every day 
prevented a set of fruit and spraying every other day did not save 
sufficient fruit to justify the expense involved. 
There are not sufficient data to make definite and conclusive 
recommendations as to the frequency with which it will be necessary 
to spray to get the best results, but it seems probable that the panicles 
should be sprayed at least every fourth day between the times the buds 
begin to swell and the flowers begin to open and that after the fruit 
is set it should be kept covered with Bordeaux mixture during the 
first 8 to 10 weeks of its development. The fruits are most sus- 
ceptible to infection just as they are setting. Consequently, it ap- 
pears that it would be best to make three applications of Bordeaux 
mixture at weekly intervals, applying the first when about one-half 
to two-thirds of the blossoms have opened, and following these by 
a fourth application after a lapse of two weeks and a fifth three weeks 
later, making five sprayings for the fruit and two, or in some cases 
three, for the panicles. 
INFLUENCE OF THE WEATHER ON POLLINATION. 
It has been tentatively suggested by Fawcett 1 and by Collins 1 that 
the blighting of the blossoms, which is so uniformly observed through- 
out the Tropics whenever the mango is subject to moist, showery 
weather at blooming time, may be due to lack of pollination. 
It is probable that such conditions interfere with pollination to 
some extent, but the evidence at hand points strongly to the fact 
that in Florida, at any rate, the anthracnose fungus is chiefly respon- 
sible for this phenomenon. Repeated attempts have been made to 
germinate the pollen, but without success. The fact that the mango 
fruits heavily in dry localities indicates that its shy bearing in Florida 
is due to external conditions rather than to any inherent defect in the 
plant. 
An exact count was made of the number and types of flowers borne 
on 10 panicles of a Mulgoba, 10 of a Totafari, and 5 of a seedling 
mango tree. They were made by going over the flower clusters 
every day and picking off with a pair of forceps the flowers that had 
opened, the kind and number being recorded. The mango bears 
two types of flowers, staminate and perfect, and only one stamen is 
found in each flower. 
The 10 Mulgoba panicles bore a total of 7,038 flowers, of which 
4,119 were staminate and 2,919 perfect. The 10 Totafari panicles 
i Op. cit. 
