Table 2. Growth rates of southern pine beetle infestations before and after application of suppression treatments in 1994.

Pre-Treatment
Post-Treatment
Infestation
No.
Mean
DBH
inches
Trees
Killed/
Day
Active
Trees at
Treatment
Verbenone
used
ml/ft2
Trees
Killed/
Day1
%
Growth
Reduction
VERBENONE-ONLY
NC-01
 8.0
1.1
 46
21
0.4a
 64
NC-02
12.3
1.4
 79
14.3
1.1c
 22
GA-01
 4.5
0.7
 37
25.0
0.2a
 71
GA-02
 8.6
0.7
 29
58.3
0.0a
 94
AL-01
 5.0
1.2
 47
50.0
0.5a
 58
Mean
8.7
1.0
47.6
33.8
0.5
 61.82
VERBENONE-PLUS-FELLING
VA-01
 6.3
0.8
 44
32.6
0.1a
 91
VA-02
 7.5
1.3
 24
36.5
0.1a
 96
NC-03
11.4
0.5
 23
23.3
0.2a
 60
SC-01
 7.2
5.8
115
32.2
0.1a
 98
SC-02
 8.0
2.3
115
13.8
0.3a
 87
GA-03
 6.6
0.6
129
 9.8
0.8c
­25
AL-02
 6.4
0.5
 96
19.2
0.4a
 20
TX-01
 7.9
0.8
 56
19.8
0.0a
100
TX-02
 7.4
2.4
107
25.8
0.0a
100
Mean
7.6
1.7
78.8
23.7
0.2
 69.82
VERBENONE-PLUS-FELLING FRESH ATTACKS
AL-01
 5.5
1.0
 24
116.2
0.3a
70
AL-02
 7.8
0.8
 87
---
1.2c
­33
TX-03
 7.7
0.8
 34
24.5
0.0a
100
TX-04
 6.9
1.8
 60
33.1
0.5a
 72
TX-05
 8.5
2.2
 86
22.1
0.4b
 83
TX-06
 8.7
0.7
 40
22.0
0.0a
­96
TX-07
 6.2
2.2
 60
31.3
0.0a
100
Mean
9.2
1.4
55.9
48.5
0.4
 69.62
UNTREATED CONTROL
NC-04
 8.7
-
 43
-
0.0
-
GA-04
 5.6
-
250
-
2.4
-
TX-08
 7.7
-
 51
-
1.1
-
TX-09
 7.5
-
189
-
4.0
-
TX-10
13.1
-
 35
-
0.3
-
TX-11
17.0
-
 33
-
2.3
-
TX-12
15.5
-
 37
-
1.1
-
TX-13
 8.2
-
 24
-
0.8
-
TX-14
12.6
-
 77
-
3.3
-
TX-15
 7.2
-
222
-
6.2
-
TX-16
17.0
-
 81
-
3.1
-
TX-17
15.7
-
 57
-
2.1
-
TX-18
14.3
-
 23
-
0.0
-
Mean
11.5
-
86.3
-
2.1
-
  1. a   Total suppression (no trees attacked beyond treated buffer during 6-week post-treatment period).
    b   Partial suppression (trees attacked beyond treated buffer, infestation growth decreased by > 50%).
    c   No suppression (trees attacked beyond treated buffer, infestation growth decreased by < 50%).


  2. Mean values were calculated by summing % reduction for each infestation and dividing by the number of infestations.