LLUSTRATIONS- 
TLATES. 
Page. 
Plate I. Adults of the sugar-beet wireworm (Limonius calif ornicus) , showing 
variation in size 12 
II. Stagesof the sugar-beet wireworm. Fig. a. — Adult. Fig.b. — Newly 
hatched larvse. Fig. c. — Eggs 12 
III. A sugar-beet wireworm in process of molting 12 
IV. Wireworms and wireworm-like larvae 12 
V. Pupa of the sugar-beet wireworm 16 
VI. Injury by the sugar-beet wireworm to germinating beans 16 
VII. Injury by the sugar-beet wireworm to germinating bean, enlarged. . 16 
VIII. Fig. 1. — Sugar-beet wireworms in petri dish, killed by bacteria in 
cultures of agar. Fig. 2. — Root cage used in rearing young wire- 
worms 20 
IX. Work of the sugar-beet wireworm. Young sugar-beets, showing 
injury by wireworms to taproots; blackened feeding marks visible 
on end of roots 24 
X. Work of the sugar-beet wireworm. Nearly mature beets killed by 
wireworms; blackened feeding marks noticeable on taproots 24 
XI. Work of the sugar-beet wireworm. Mature beets, showing old scars 
resulting from wireworm injury 24 
XII. Ravages of the sugar-beet wireworm. Beet field, showing small 
cleared space resulting from the work of wireworms 24 
XIII. Ravages of the sugar-beet Avireworm. Beet field, showing cleared 
spaces resulting from the work of wireworms 24 
XIV. RaA^ages of the sugar-beet wireworm. Beet field, showing cleared 
spaces, more extensive than in Plate XIII, resulting from the work 
of wireworms 24 
XV. Ravages of the sugar-beet wireworm. Beet field, showing very large 
cleared space resulting from the work of wireworms 24 
XVI. Adult of the sugar-beet wireAvorm issuing from pupal skin 32 
XVII. Habits of beetles of the sugar-beet wireworm. Fig. 1. — Beetles of 
the sugar-beet wireworm in secondary hibernation under slice of 
sugar beet. Fig. 2. — Beetles of the sugar-beet wireworm photo- 
graphed while feeding on slices of sugar beet 32 
XVIII. Secondary hibernation of the sugar-beet wireworm. Beet tops used 
by beetles as quarters for secondary hibernation 36 
XIX. Fig. 1. — Field of young beets at age when they begin to be partially 
safe from severest injury by the sugar-beet wireworm. Fig. 2. — 
Beet field showing conditions favorable for increase of wireworms. 
Weed hedges which shelter adults in secondary hibernation 60 
XX. Conditions favoring the sugar-beet wireworm. Beet field imme- 
diately after harvest, showing beet tops carelessly scattered over 
ground 60 
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