LLUSTRATIONS. 
Page. 
Plate I. Conditions favoring the spread of the alfalfa wee^dl. Fig. 1. — 
Volunteer growth of alfalfa on vacant lots in Salt Lake City, Utah. 
Fig. 2. — Volunteer alfalfa growing along the right of way of the 
Oregon Short Line Railway, a short distance north of Salt Lake 
City, Utah 12 
II. Hibernation of the alfalfa weevil. Figs. 1, 2. — Hibernating places 
of the alfalfa weevil along fences and borders of fields in the 
vicinity of Salt Lake City, Utah. Fig. 3. — One of the main irriga- 
tion ditches in the Salt Lake Valley, a favorable hibernating 
place for alfalfa weevils 16 
III. Injury wrought by the alfalfa weevil. Fig. 1. — One of the worst 
infested fields in the Salt Lake Valley, showing injury to the first 
crop of alfalfa, which was left uncut. Fig. 2. — (a) Bunch of 
alfalfa uninjured by the alfalfa weevil; (b) bunch of alfalfa badly 
injured by the alfalfa weevil, showing growth made by first crop 
in the badly infested fields 20 
IV. Injury wrought by the alfalfa weevil. Fig. 1. — Crop secured from 
first cutting of one of the worst infested fields. Fig. 2. — First 
cutting from another field damaged from attack by the alfalfa 
weevil. Fig. 3. — First cutting secured from one of the fields of 
alfalfa slightly injured by the attack of the weevil 20 
V. Field experiments against the alfalfa weevil. Fig. 1. — Street 
sweeper in operation on alfalfa field after first crop was removed. 
Fig. 2. — Second crop ready to cut in field on which street sweeper 
was used June 14. Fig. 3. — Second crop of alfalfa growing on 
field where no treatment was given 28 
VI. Field experiments against the alfalfa weevil. Fig. 1. — Wire-brush 
cultivator in operation on alfalfa field after first crop was removed. 
Fig. 2. — Second crop of alfalfa growing nicely as a result of treat- 
ment given. Fig. 3. — Condition of untreated fields about June. . . 28 
VII. Field experiments against the alfalfa weevil. Fig. 1. — Second crop 
of alfalfa, estimated at 2 tons per acre, secured from field treated 
with wire-brush cultivator. Fig. 2. — Fourth crop of alfalfa 
secured from field where brush cultivator was used. Fig. 3. — 
Condition of field used as check (PI. V, fig. 3) 28 
VIII. Field experiments against the alfalfa weevil. Fig. 1. — Alfalfa field 
after first crop was removed, severely disked preparatory to appli- 
cation of "mudding" process against alfalfa weevil. Fig. 2. — Fol- 
lowing the irrigation water with a drag, to puddle the weevils in 
the mud 28 
IX. Field experiments against the alfalfa weevil. Fig. 1. — Second crop 
of alfalfa in field treated by the "mudding" process. Fig. 2. — 
Condition of untreated fields at time photograph shown in figure 1 
was taken. Fig. 3. — Patch of first crop left in field shown in 
figure 1, showing how larvae were disseminated from the first crop 
into the field where the weevil had been killed by the "mud- 
ding " process 28 
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