|
Week of
|
|
2004
|
June
1 |
June
8 |
June
15
|
June
22 |
June
29 |
July
6
|
July
13 |
July
20 |
July
27 |
|
North Central Region
|
|
|
|
|
|
|
|
|
|
Renville County- Mohall
Trapper-Janet Knodel |
0
|
2
|
4
|
9
|
7
|
24
|
19
|
49
|
27 |
Bottineau County-Kramer
Trapper-Tim Semler
|
-- |
23 |
24 |
13 |
44 |
23 |
7 |
58 |
65 |
Bottineau County-Bottineau
Trapper-Tim Semler
|
-- |
18 |
14 |
78 |
134 |
41 |
39 |
122 |
146 |
Ward County-NCREC, Minot
Trapper-Janet Knodel
|
2 |
27 |
14 |
26 |
32 |
200 |
96 |
195 |
120 |
Ward County-Carpio
Trapper-Mike Rose
|
0 |
0 |
0 |
25 |
9 |
-- |
13 |
25 |
-- |
|
Northwest Region
|
|
|
|
|
|
|
|
|
|
Divide County-Crosby
Trapper-Keith Brown
|
5 |
10 |
1 |
2 |
6 |
28 |
38 |
45 |
50 |
Burke County-NE Bowbells
Trapper-Dan Folske
|
-- |
25 |
30 |
9 |
5 |
15 |
49 |
-- |
64 |
Burke County-N Bowbells
Trapper-Dan Folske
|
-- |
3 |
3 |
8 |
17 |
7 |
59 |
-- |
134 |
Burke County-Columbus
Trapper-Dan Folske
|
-- |
13 |
15 |
8 |
36 |
10 |
35 |
-- |
5 |
McKenzie County-Arnegard
Trapper-Dale Naze
|
6 |
26 |
17 |
14 |
37 |
91 |
142 |
153 |
-- |
Williams County-Williston
Trapper-Chet Hill
|
-- |
-- |
0 |
-- |
-- |
34 |
115 |
55 |
-- |
|
Northeast Region
|
|
|
|
|
|
|
|
|
|
Cavalier County-Langdon
Trapper-Bryan Hanson
|
|
|
|
|
set-out |
1 |
43 |
67 |
115 |
|
Southwest Region
|
|
|
|
|
|
|
|
|
|
Hettinger County-New England
Trapper-Roger Ashley
|
10 |
51 |
9 |
4 |
8 |
53 |
290 |
343 |
-- |
Dunn County-Dickinson
Trapper-Roger Ashley
|
3 |
11 |
13 |
42 |
184 |
81 |
107 |
205 |
87 |
|
Minnesota-Dave LeGare
|
|
|
|
|
|
|
|
|
|
|
Pennington County-Thief River Falls
|
|
|
|
set-out |
25 |
75 |
110 |
242 |
100 |
|
Roseau County-Roseau
|
|
|
|
|
set-out |
60 |
200 |
135 |
57 |
|
Marshall County-Grygla |
|
|
|
set-out |
22 |
41 |
70 |
61 |
30 |
|
Red Lake Falls |
|
|
|
|
|
set-out |
37 |
145 |
30 |
|
Kennedy |
|
|
|
|
|
set-out |
110 |
300+ |
290 |
|
Interpreting Diamondback Moth Cumulative Moth Counts
The population of adult diamondback moths will be monitored from early-June through July.
Monitoring is done using pheromone baited traps. Each week moths caught in the traps are
counted, and data for that week, as well as cumulative moth counts, are entered into the table for
the appropriate trapping area. The cumulative total number of moths will continue to rise until
the end of the monitoring period.
The diamondback moth does not overwinter in North Dakota. Moths are carried
into North Dakota from the southern U.S. on northerly winds in May or June. The traps will indicate if
diamondback moth has arrived in an area.
The traps also indicate the risk of an infestation. The level of moths caught in the traps combined
with weather conditions need to be considered when determining the risk of an infestation. A high
level of diamondback moths in the traps early in the season has more of a potential for a damaging
infestation than if high counts occur later in the season. For example, 100 moths caught in a trap
during a week in June would indicate the potential for an outbreak exists. Factors such as parasites
and weather conditions would determine to what degree the infestation develops. Rainfall is a
natural control agent of diamondback moth, as it can easily dislodge young larvae from the plants
and can drown larvae on the soil surface or in water trapped on the plants. Cool, cloudy weather
reduces moth flight activity, and the longer inclement weather persists, the more females die before
egg laying is completed.
A high risk of an infestation exists if high numbers of diamondback moth adults are found in the
traps early in the season, and hot dry weather prevails from June to the harvesting of canola.
(Other links:
Manitoba
Diamondback Moth Factsheet)
|
