120 
THE PLUM CURCULIO. 
OCCURRENCE OF BEETLES IN ORCHARDS. 
The relative abundance during the season and the distribution of 
the beetles in orchards are shown to a certain extent by jarring 
records. Several such records have been obtained, beginning the 
work of jarring quite early in the spring and continuing at short 
intervals until the gathering of the fruit crop, or later. The early 
portions of the following records, with additional ones, have been 
given in connection with the consideration of activity of beetles in 
spring. 
Table LXVIII gives the results of jarring 950 Elberta peach trees, 
at Siloam Springs, Ark., for the period from March 28 to June 27, 
1908. This block of trees was used to determine the value of jarring 
in protecting the fruit from injury, as referred to on page 174. 
Table LXVIII. — Jarring record for the plum curculio on peach, Siloam Springs, Ark., 
1908. 
Dates of 
jarring. 
Beetles 
caught. 
Dates of 
jarring. 
Beetles 
caught. 
Mar. 28 
30 
6 
May 2 
5 
9 
12 
14 
21 
25 
26 
27 
30 
June 3 
n!"!." 
15 
17 
19 
22 
27 
41 
13 
28 
57 
15 
91 
193 
20 
198 
87 
76 
112 
131 
96 
107 
84 
118 
128 
31 
Apr. 2 
2 
4 
6 
8 
11 
13 
14 
15 
17 
20 
22 
24 
27 
30 
1 
1 
42 
17 
13 
8 
44 
64 
146 
169 
75 
10 
16 
Total J 2,209 
I 
The spring, on the whole, was late, there being much cool and 
rainy weather. The beetles were notably scarce, only 2,209 insects 
being captured during the period of jarring, an average of about 2.3 
beetles per tree. Considerable variation in the number captured on 
successive dates of jarring is to be noted. Thus, on May 25, 193 
beetles were taken, and the following day only 20. The record 
indicates the erratic behavior of the beetles due, it is believed, to 
weather conditions, but shows that by April 8, beetles were out in 
numbers, the maximum emergence occurring during late May and 
during June, with a smaller maximum about the third week in April. 
In Table LXIX are shown results from jarring a block of 75 peach 
trees at North East, Pa., during 1910. The trees were in sod and 
had never received treatment for the curculio. They were jarred 
every other day, unless weather conditions prevented, beginning April 
15 and ceasing September 2. The three specimens captured April 15 
