Canola Insect Trapping Network

Canola Insect Trapping Network Diamondback Moth
Week of
	May 23	May 30	June 6	June 13	June 20	June 27	July 4	July 11
North Central Region	--	--	--	--	--	--	--	--
Renville County-W. Mohall Trapper-Louie Voigt	--	--	--	setout	25	70	114	36
Bottineau County-Bottineau Trapper-Tim Semler	--	setout	98	62	99	66	206	426
Bottineau County-Kramer Trapper-Tim Semler	--	setout	148	132	117	67	205	536
Bottineau County-Willow City Trapper-Tim Semler	--	setout	46	54	32	85	19	84
Burke County-Bowbells Trapper-Dan Folske	151	84	57	95	53
Burke County-Bowbells 2 Trapper-Dan Folske	88	22	21	52	56
Burke County-Powers Lake Trapper-Dan Folske	32	23	13	45	43
Ward County-NCREC, Minot Trapper-Jan Knodel	37	93	50	41	49	62	173	265
Ward County-Kenmare Trapper-Mike Rose	setout	80	280	50	96	--	110	87
Western Region
McKenzie County-Arnegard Trapper-Dale Naze	setout	70	15	118	72	16	110	20
Northwest Region	--	--	--	--	--	--	--	--
Divide County-Crosby (north) Trapper-Keith Brown	setout	51	17	26	47	74	39	32
Williams County-Williston Trapper-Chet Hill	setout	10	53	227	82	314	62	pulled
Southwest Region	--	--	--	--	--	--	--	--
Slope County-New England Trapper-Roger Ashley	28	34	68	48	34	36	28	52
Dunn County-Dickinson Trapper-Roger Ashley	32	5	64	38	4	34	25	30
Northeast Region	--	--	--	--	--	--	--	--
Cavalier County-Langdon Trapper-Bryan Hanson	--	--	--	--	--	--	39	216
Minnesota
Pennington County-Thief River Falls Trapper-Dave LeGare		setout	52	136	249	50	40	54
Red Lake Falls Trapper-Dave LeGare		setout	78	63	82	29	67	264
Roseau Trapper-Dave LeGare		setout	--	282	240	10	40	46
Grygla Trapper-Dave LeGare		setout	111	30	59	67	90	295
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)