2018 Cumulative counts for bertha armyworm pheromone traps

Pheromone trapping for the 2018 growing season is now completed with cumulative counts revealing  moths at five of the six sites AAFC-Beaverlodge monitored (Fig. 1).  The site near Fairview had the highest moth counts but the total number of intercepted moths still sits within the "low risk" category used by Alberta Agriculture and Forestry to help predict bertha armyworm larvae during the early pod stages. 

Figure 1.  Cumulative pheromone trap counts (n=1 trap per site) from commercial fields of canola grown in the Peace River region in 2018.  This preliminary data is not to be copied or reproduced without permission.

Growers are encouraged to use the above information to prioritize their in-field scouting.  The above pheromone traps are not precise predictors but remain valuable to growers because they help identify WHERE the moths were flying and WHICH FIELDS TO CHECK for larvae (Fig. 2).

Figure 2.  Late instar bertha aryworm larvae (photo credit: AAFC-Saskatoon).

When present, bertha armyworm larvae should now be moving upwards on canola plants to feed on the developing pods.  The economic threshold for bertha armyworm applies to the larval stages so use the tables posted here to help guide your in-field pest management. 

Remember two important concepts for insect pest management in your canola fields:

• Low numbers of bertha armyworm can fall within a tolerable level where negligible feeding damage may occur but no economic losses will result!  Scout and use the economic threshold values to avoid economic losses!
• Reserve insecticide use only to manage outbreaking populations of bertha armyworm!  Not spraying actually protects and preserves the many natural enemies already actively working for free in fields!

Learn more about bertha armyworm, @FieldHeroes, natural enemies, and use the canola scouting chart to help your canola produce this year!

Contact Jennifer Otani for more information and thank you to our producer-cooperators!

2017 Peace Canola Survey - Otani, Vankosky, Olfert

The 2017 Annual Peace Canola Survey was completed by Agriculture & Agri-Food Canada staff based at Beaverlodge and Saskatoon.

Since 2003, the annual survey has been performed with the main objectives of (i) collecting insect pest data throughout the region and (ii) to detect the introduction of the cabbage seedpod weevil into the Peace River region.  In 2017, a total of 102 commercial fields of Brassica napus (e.g., each field ≥80 acres in size) were surveyed and no B. rapa was encountered.  

Fields were surveyed by sweep-net using 50 - 180° sweeps on the following dates in these areas:
• July 4 near Manning, Hawk Hills, Tompkins Landing, Blue Hills, Buffalo Head, LaCrete, Rocky Lane.
• July 10 near Crooked Creek, DeBolt, Bezanson, Grande Prairie.
• July 11 near Guy, High Prairie, McLennan, Falher, Nampa, Peace River, Tangent, Watino, Smoky River, LaGlace, Woking, Spirit River, Rycroft, Fairview, Hines Creek, Sexsmith.
• July 12 near Whitelaw, Berwyn, Grimshaw, Marie Reine, Jean Cote, Girouxville, Eaglesham, Wanham, Peoria, Teepee Creek, Hythe, Baldonnel, Montney, Rose Prairie, Fort St. John, Cecil Lake, Doe River, Rolla, Valhalla, Demmitt, LaGlace, Grande Prairie, Goodfare, Elmworth, Blueberry Mountain, Silver Valley, Bonanza.

Sweep-net samples were frozen then processed to generate data for a total of 9730 arthropods (excluding thrips and aphids) which were identified and categorized into 39 taxa.  The 2017 summary includes eight economically important insect pests reported from 98 surveyed canola fields plus data related to rotational practices in the Peace River region:

The 2017 summary is available as a downloadable PDF file.

THANK YOU to the following hard working AAFC staff who surveyed†, processed‡, and mapped∞ this data:  Jadin Chahade1†‡, Kaitlin Freeman1†‡, Holly Spence1†‡, Rebecca Wu1†‡, Charlotte Morrison1†‡, Cameron McGlade-Bouchard1†‡, Shelby Dufton1‡, Amanda Jorgensen1‡, and David Giffen2∞.

Finally, and MOST IMPORTANTLY, Thank you to our canola producers for allowing us to sample in their fields!

Prairie Pest Monitoring Network 2017 Risk and Forecast Maps

The Prairie Pest Monitoring Network has posted the 2017 Risk and Forecast Maps for insect pests monitored throughout the Canadian prairies.  Link here to access the Post and to view the downloadable maps.

2016 Peace Canola Survey - Summary is available now!

The 2016 Annual Peace Canola Survey was completed by Agriculture & Agri-Food Canada staff based at Beaverlodge and Saskatoon.

Since 2003, the annual survey has been performed with the main objectives of (i) collecting insect pest data throughout the region and (ii) to detect the introduction of the cabbage seedpod weevil into the Peace River region.  In 2016, a total of 156 commercial fields of Brassica napus (e.g., each field ≥80 acres in size) were surveyed and no B. rapa was encountered.

Fields were surveyed by sweep-net using 50 - 180° sweeps on the following dates in these areas:
• July 5 near Whitelaw, Berwyn, Grimshaw, Dixonville, Manning, Hotchkiss, Hawk Hills, Notikewin, Blue Hills, Buffalo Head, La Crete.
• July 6 near Fort Vermilion, Blumenort, Valhalla, La Glace, Westmark, Woking, Spirit River, Blueberry Mountain, Silver Valley, Bonanza, Bay Tree, Beaverlodge, Halcourt, Wembley, Grande Prairie, Clairmont, Sexsmith, Teepee Creek, Bezanson, Dimsdale, Huallen, Fairview, Vanrena, Hines, Creek, Worsley, Eureka River,
• July 7 near Rycroft, Webster, Hythe, Wanham, Girouxville, Watino, Eaglesham, Belloy, Dawson Creek, Rolla, Dow River, Clayhurst, Cecil Lake, Fort St. John, Farmington, Valleyview, Guy, Falher, Reno, Nampa, Peace River, Marie-Reine, McLennan, Whitemud Creek.

Sweep-net samples were frozen then processed to generate data for a total of 21,278 arthropods which were identified and categorized into 38 taxa. The 2016 summary includes 15 economically important pests of canola reported from 156 surveyed canola fields plus data related to rotational practises in the Peace River region.

The 2016 summary is available as a downloadable PDF file.

THANK YOU to the following hard working AAFC staff who surveyed†, processed‡, and mapped∞ this data: Jadin Chahade1†‡, Kaitlin Freeman1†‡, Holly Spence1†‡, Hannah Avenant1†‡, Laura Stewart1†‡, Celine Coschizza1†‡, Emily Lemke1†‡, Owen Olfert2†∞, Taylor Kaye2†∞, Shelby Dufton1‡, and Amanda Jorgensen1‡.


Finally, and MOST IMPORTANTLY, Thank you to our canola producers for allowing us to sample in their fields!

Bertha armyworm monitoring

This week on the Farm: Bertha Armyworm (Mamestra configurata)

The past few days we have been very busy setting up Bertha Army Worm traps.  Bertha Armyworm adults will begin to emerge from their overwintering pupa around early June and will continue until early August. The number of adults collected by a trap will provide an indication of the risk of larval damage.

When setting up a monitoring site for Bertha Armyworm, it is important that the traps are not placed next to a shelterbelt, ditch, or within ½ a kilometer of a strong light source. Each trap should be located about 2 m from the edge of the field.  In the Peace River region, previous trapping has resulted in high numbers of native Bombus species so only one trap is deployed per site.

The traps used to monitor Bertha Armyworm are called Unitraps. The trap is all green and is mounted  approximately 1metre above the ground on a strong stake (Figure 1). Inside the trap, a pheromone lure is positioned to attracts male moths into the bucket then a Vapona insecticide strip within the bottom of the trap kills the males once they are inside the bucket.

Figure 1. Unitrap mounted on stake within a field
(photo source: http://insectpestmanagement.blogspot.ca/p/blog-page.html)

Our Bertha armyworm traps are collected weekly.  To do so, the Unitrap is opened, the contents are carefully emptied into a small brown paper bag which is labelled then stapled shut. The sample is taken back to the lab where the moths and by-catch are sorted and typically the specimens are pinned and labelled.  

Presently, non-automated traps are used.  However, because Bertha Armyworm moths are active at dusk, our lab has tested automated pheromone traps that remain closed during the day to reduce by-catch of Bombus species.  That automated traps were designed to remain closed during the day but automatically open in the evening to attract and intercept bertha armyworm males during peak flight times.

For more information on Bertha Armyworms follow the link to the protocol: http://www.westernforum.org/Documents/IPMN%20Protocols/2013_BAW%20Monitoring%20protocol.pdf

-Kaitlin

Canola Scouting Guide

Field scouting is critical because it enables the identification of potential risks to crops. Canola production systems across the Canadian prairies will suffer insect pest outbreaks. However, the identification of these insect pests PLUS the application of established monitoring methods will enable growers to make informed pest management decisions.

This year we offer a generalized canola scouting chart to aid in-field scouting on the Canadian prairies. This guide contains hyperlinks to help growers learn more about some of our insect pests and how to monitor.

Whenever possible, monitor and compare to established economic thresholds so pollinators and beneficial arthropods are preserved.  Economic thresholds, by definition, can help growers avoid crop losses due to an insect pest.

Good luck with the growing season!

This, along with many other resources, can also be accessed at the Prairie Pest Monitoring blog.