|
|
AgAlerts 2001 From Griggs County
|
Issue # 8, July 13, 2001
Thistle Caterpillars: These insects should be close to completing the caterpillar phase of their life cycle. Soon they should form cocoons and pupate into the painted lady butterfly. This process takes about 10 days. This will be the third generation this summer. Growers will be urged to monitor sunflower field in about 10 to 15 days for thistle caterpillar feeding again. It takes about ten days for the caterpillars to pupate and emerge as butterflies. The following site from NDSU Entomology has more information on the life cycle and pictures of the various stages, Thistle Caterpillars. For insecticides cleared for control consult the 2001 Insect Pest Management Guide.
Sunflower Beetles: Reports of sunflower beetle larvae feeding on sunflower. Fields I have looked at vary, but have been seeing average counts pushing threshold levels. The current recommendation is 10 to 15 larvae per plant or 25 to 30 percent defoliation. These larvae are young and very small at this time so getting a accurate count may be difficult. The following site from NDSU Entomology has more information on the life cycle and pictures of the various stages, Sunflower Beetles. For insecticides cleared for control consult the 2001 Insect Pest Management Guide.
Leafy Spurge Beetle Collections
Leafy spurge beetle collections have been very good this past week. The Griggs County Weed Board will not be holding any more collection days. If an individual would like to collect some beetles for themselves, contact the Extension Office to find out a location where they can be collected. Barnes County is collecting insects. For the dates and locations contact Jim McAllister, Barnes County Weed Board.
Corn borer is picking up and reports of feeding in the counties of Ransom and Richland. Central counties peak emergence should occur around July 14. Peak egg laying occurs within 10 days. Scouting for corn borer egg masses should begin. The two generation corn bores that occur at low levels have been active since about June 10th. Black light traps have been light, but this traps are an indication of moth activity and not as good for assessing the size of the population. So monitor corn the next weeks for corn borer activity.
Carrington Research and Extension Center Field Days
The Carrington R/E Center will be holding their annual Field Days on Thursday July 19th. The field day at the Carrington Research Extension Center will begin at 9 a.m. and feature tours, a beef- bison research review, a crop variety review and an irrigation research and high value crop tour. A lunch will be served. Afternoon tours begin at 1 p.m. Tours include plant disease and insect management, soil, water and crop management and weed management. Tours of the center's aquaculture facility also will be conducted during the day. The North Dakota Dry Pea and lentil Association tour will be conducted at the center following the afternoon tours. The center is located 3.5 miles north of Carrington on Highway 281. For more information, call (701) 652-2951 or get a complete agenda for the following site. http://www.ag.ndsu.nodak.edu/carringt/events.htm
Please Contact Our Office For Additional Information
E-mail: griggs@ndsuext.nodak.edu
Go to the 2001 AgAlert Index Page