6 BULLETIN 807, U. S. DEPARTMENT OF AGRICULTURE. 
beans where the tissue was consumed by the larvae (PI. I, figs. 4, #, b, 
and 5) . This " buggy " appearance lessens the salability of the beans. 
Infested beans are not only reduced somewhat in weight (see Table 
I) but their germinating power is also lessened, as will be shown 
later on. 
Table I. — Showing amount of beans consumed by the broad-bean weevil. 
Number of weevils in beans. 
Weight of 
50 beans. 
Weight 
consumed. 
Percentage 
consumed. 
Grams. 
76, 970 
74, 800 
72,430 
70,150 
Grams. 
1 
2,170 
4,540 
6,820 
2.81 
2 
5.89 
3 
8.86 
This table shows that approximately 3 per cent of the weight of a 
bean is consumed by the larva of each weevil developing in it. 
EXTENT OF DAMAGE. 
It is estimated that the area devoted to broad beans commercially 
is at present about 3,000 acres for the dry beans, 100 acres for can- 
ning green, and 1,000 acres for cover crops. In addition many hun- 
dreds of acres are grown in small lots, back-yard gardens, etc., for 
home consumption. The commercial production of dry beans for 
market is at present about 50,000 bags, but has been, before weevil 
damage became so general, as much as 200,000 bags. 
After a careful survey of the 1916, 1917, and 1918 crops of horse 
beans, and of numerous samples taken by food inspectors of the 
Bureau of Chemistry and the writer. Tables II and III were pre- 
pared. 
Table II. — Summary of the percentage of infestation of the 1916, 1917, and 
1918 crops of broad beans grown in California. 
Infestation. 
to 5 per cent 
5.1 to 10 per cent . 
10.1 to 15 per cent 
15.1 to 30 per cent 
Above 30 per cent 
Total 
1916 crop. 
Number 
of bags. 
18, 851 
8,366 
6,835 
11,114 
4,318 
49, 474 
Per cent 
of total 
crop. 
38. 10 
16.88 
13.81 
22.46 
8.75 
100. 00 
1917 crop. 
Number 
of bags. 
15,372 
6, 855 
4,904 
4,852 
1,107 
Per cent 
of total 
crop. 
46.46 
20.71 
14.82 
14.66 
3.35 
33, 090 
100. 00 
1918 crop. 
Number 
of bags. 
6,638 
5,341 
4,629 
10,547 
3,681 
33, 036 
Per cent 
of total 
crop. 
26.75 
16.16 
14.01 
31.93 
11.15 
100. 00 
