10 
THE SUGAE-BEET WIEEWOKM, 
Page. 
Plate XXI. Clean culture against the sugar-beet wireworm. Natural method 
of clearing off beet tops, by pasturing cattle in the field. 
which has been inclosed by a temporary fence 60 
XXII. Clean culture against the sugar-beet wire worm. Collecting the 
beet tops in piles and hauling them from the field as food for 
stock 60 
XXIII. Conditions favoring the sugar-beet wireworm. Fig. 1. — Beet 
fields separated by a strip of alfalfa. Fig. 2. — Field of alfalfa 
adjoining field of sugar beets 60 
TEXT FIGURES. 
Fig. 1. The sugar-beet wireworm (Limonius calif ornicus). Details of larva. 15 
2. Map of California showing counties from which the sugar-beet wire- 
worm has been reported 17 
3. Injury by sugar-beet wireworm to field of sweet corn, Dominguez, Cal. 18 
4. Diagram showing the period eggs of the sugar-beet wireworm were in 
the soil, with temperature; season of 1912, Compton, Cal 19 
5. Janet ants' -nest plaster-of-Paris cage, used in rearing sugar-beet 
wireworms 22 
6. A sugar-beet wireworm devouring one of its own kind; to illustrate 
cannibalistic habit 25 
7. Diagram showing length of life of sugar-beet wireworm without food. . 28 
8. Screen cage used in obser^dng oiaposition of adults of the sugar-beet 
wireworm under field conditions 36 
9. Diagram of beet fields, to illustrate the effect of clean culture in 
reducing injury by the sugar-beet wireworm 63 
