April, ’24] 
headlee: dusts for stored seed insects 
299 
certain proportons resulted in a large measure of protection from the 
ravages of the bean weevils. 
Table l. 3 Effect of Mixing Various Dusts with Dry Common, White Beans 
when the Culture is Promptly Seeded with 5 Adult Bean Weevils (Bruchus 
obtectus) Temperatures 80° F. 
and Humidity 73.4% 
Proportion by weight 
Milltown 
Beans 
Substance 
Adults 
CaO 
CaCL 
Ca(OH) 2 
Ball Clay 
start 
No. 9 
Holes 
Holes 
Holes 
Holes 
32 
1 
5 
30 
66 
16 
1 
5 
0 
1 
5 
0 
8 
1 
5 
0 
0 
0 
0 
4 
1 
5 
0 
13 
0 
0 
2 
1 
5 
0 
0 
1 
0 
1 
1 
5 
0 
0 
1 
0 
Thus it appears the mixing of common, white, edible beans with ground 
burned lime (200 mesh) (Calcium chloride (mostly 200 mesh), hydrated 
lime (mostly 200 mesh or finer), and Milltown Ball Clay No. 9 (200 
mesh) in various proportions gives protection in the lower dilutions, 
ground burned lime and the clay giving the best results with the higher 
dilutions. 
Table 2. Effect of Placing Various Dusts in the Same Container with 
Beans Seeded to Common Bean Weevil when the Beans and the Weevils 
are Separated and Fully Protected From Contract with the Dusts by a 
Thick Layer of Absorbent Cotton. Temperature 80°F and Humidity 73.4 % 
Proportion by weight . Milltown 
Beans 
Substance 
Adults 
CaO 
CaCL 
Ca(OH) 2 
Ball Clay 
start 
Holes 
Holes 
Holes 
No. 9 
Holes 
4 
1 
15 
50 
257 
2 
1 
15 
14 
50 
184 
27 
1 
1 
15 
0 
4 
147 
0 
1 
2 
15 
0 
24 
10 
0 
1 
4 
15 
0 
0 
199 
0 
Control 60 
This table shows that ground burned lime (CaO) and clay have a 
decided protective effect even when not in contact with the beans. 
throughout tables 1 & 2 each hole represents a distinct chamber from which the 
new beetle had already or not at that time emerged. 
