- 6 - 
TABLE 2. — Comparison of insect visitors observed on apple, cherry, 
pear, and plum blossoms at Camino, Calif., during the 
seasons of 1932 and 1933 
Insects 
• 
• 
• 
• 
Number i 
of. insects 
Percent of 
total visitors 
Blowflies 
• 
• 
• 
* 
10,774 
926 : 
759 
200 
164 
33 J 
230 
82.3 
7.1 
t 
! 5.8 
Syrphid flies ..... 
* 
: 1.5 
• 
: 1.3 
• 
• 
.2 
1.8 
Total 
• 
• 
• 
13,086 
: 100.0 
• 
• 
Increased Areas under Cultivation 
Cultivation of the land destroys the nest3 of beneficial insects 
and discourages rehabitation. The 1940 census reports a decrease in farm 
wood lots (nesting sites) of over 53 million acres since 1910. 
Brittain, W. H. 
1933. Apple pollination studies in the Annapolis Valley, N. S., Canada, 
1928-1932. Canada Dept. Agr. Bui. 162, 198 pp. 
p. 92: Observations were made by Hooper (1929 and 1931) over 
several years on the numbers of various insects visiting apple blossoms, 
and the numbers added up. The district contained many cherry, apple 
and other fruit plantations and numbers of hive bees were kept. The 
land not in orchard was either ploughed land or sheep pasture, not 
very suitable for pollinating insects. The counts on apple were as 
follows : 
Hive bees 374 
Bumble bees 37 
Halicti, etc 21 
Flies 23 
Beetles 104 
Ants 51 
Earwigs •• 3 
Thrips 2 
p. 93 J Bumble bees are a variable quantity. They are numerous 
in the region of the North Mountain, and especially in certain seasons, 
as in 1930, were a decided factor in pollination of an orchard at 
Blomidon, but in 1931 were much less numerous. In 1932 there was an 
apparent increase at some points, but, taking the area as a whole, they 
