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British Columbia Japanese beetle survey reports

2020 |2019 | 2018 | Japanese beetle detection history

Japanese beetle survey methodology

Figure 1. Japanese Beetle Trap
Figure 1. Japanese Beetle Trap

The Japanese beetle (JB) survey is a trapping program designed to detect incursions of adult Japanese beetle in BC. The survey is conducted using a Japanese beetle trap (see Figure 1) consisting of a yellow or green coloured vane which holds a floral and pheromone lure as well as a small container to capture beetles. Traps are placed based on a systematic grid throughout the urban areas of the Lower Mainland, Fraser Valley and at potential high risk introduction locations such as airports, railyards, and green waste disposal sites. Traps are also placed on Vancouver Island and the in BC interior. Traps are placed starting in mid-May, serviced every 3 weeks, and taken down in late-October. The Canadian Food Inspection Agency (CFIA) Japanese beetle survey provides critical information to the Province of BC and the City of Vancouver who are overseeing treatments on public and private lands where Japanese beetle has been detected.

2020 Japanese beetle survey results in BC

In 2020, the Japanese beetle survey trap placement began in early May and was completed on June 12. Trap collection commenced on October 15 and was completed by November 16. Due to pandemic travel restrictions, plans for trapping on the Sea to Sky Highway and the Sunshine Coast were deferred to 2021. A total of 2,507 traps were placed throughout the Province and checked at least 6 times from June to October. There were 100 traps placed on Vancouver Island, 71 traps in the BC interior and 2336 traps in Metro Vancouver and the Fraser Valley.

Figure 2. Japanese beetle canopy trap placed in David Lam Park.
Figure 2. Japanese beetle canopy trap placed in David Lam Park

The image shows a Japanese beetle trap placed in the canopy of a tree in David Lam Park

The highest density of traps was placed in the City of Vancouver. Traps around David Lam Park and high risk spots were checked more frequently. A total of 204 traps went missing and 260 were damaged during the survey, some of these were replaced and some were relocated to prevent additional vandalism. Missing traps continue to be a challenge and an additional cost of surveillance; however, we piloted the placement of JB traps in tree canopies (see figure 2) to see if these would be suitable replacements for typical ground based traps. In David Lam Park, we found canopy traps performed significantly better than nearby ground based traps. In total, 72 canopy traps, 2263 regular ground based traps, and only 1 roof top trap were placed due to limited access to private properties in the pandemic. The first and last Japanese beetle detections were on June 29 and September 30, respectively. A total of 214 beetles were caught in 39 traps (see figure 3) and of those, 162 beetles were from canopy traps. This result represents an 82% reduction in captures from last year. The CFIA detected only 2 Japanese beetles in 2 traps outside of the regulated area. 1 male was detected near King Edward Avenue and Columbia Street in Vancouver on August 7 and 1 female in the Riverwood neighbourhood of Port Coquitlam on August 25. This is the first time a female has been caught outside the regulated area.

Additional surveillance around the Vancouver International Airport (YVR) was carried out by the YVR wildlife team around cargo and runway turfed areas; no beetles were found in these traps.

In the center of the regulated area, 99% (211 out of 214) of the total Japanese beetles caught were from traps around False Creek from David Lam Park to the 3 adjacent parks (George Wainborn to the West, Coopers to the East and Charleson to the South). 81% (173 out of 214) were found within David Lam Park alone suggesting the incursion is still very centralized and is less dispersed from previous years. There were no beetles detected around any of the 2018 and 2019 positive traps outside the regulated area.

The CFIA plans to continue with enhanced JB surveillance throughout BC in 2021.

Click on image for larger view
Figure 3. 2020 Japanese beetle survey results in BC

Figure 3. 2020 Japanese beetle survey results in BC

The map shows the Lower Mainland, in British Columbia and trap locations in that area for 2020 are identified using blue circles for the negative sites and red circles for positive sites. The regulated area for Japanese beetle is represented by a zone with a pattern of red diagonals. In 2020, positives sites have been found in the Vancouver area only. The insert map shows the details of the positive locations in Vancouver.

2019 Japanese beetle survey results in BC

The 2019 Japanese beetle survey consisted of a total of 2,344 traps placed throughout the Province. The highest density of traps was placed in the City of Vancouver.

A total of 1157 beetles were caught in 51 traps (see figure 4), an 86% reduction in captures from 2018. The CFIA detected 4 Japanese beetles in 4 traps outside of the regulated area and 2 beetles outside the treatment area but still within the regulated area. There were no beetles detected around the 2018 positive trap in Delta and the 2017 detection at University of British Columbia (UBC).

Click on image for larger view
Figure 4. 2019 Japanese beetle survey results in BC. Description follows.

Figure 4. 2019 Japanese beetle survey results in BC

The map shows the Lower Mainland, in British Columbia and trap locations in that area for 2019 are identified using blue circles for the negative sites and red circles for positive sites. The regulated area for Japanese beetle is represented by a zone with a pattern of red diagonals. In 2019, positives sites have been found in the Vancouver area only. The insert map shows the details of the positive locations in Vancouver.

2018 CFIA Japanese beetle survey in BC

In spring 2018, the British Columbia Ministry of Agriculture and partners decided to attempt an eradication of Japanese beetle in Vancouver and the CFIA supported this effort through enhanced surveillance and implementation of movement restrictions for plants and soil from the regulated area to prevent the spread of Japanese beetle life stages. Additionally the CFIA, City of Vancouver, Invasive Species Council of BC, BC Landscape and Nursery Association, MetroVancouver Regional District and other partners conducted extensive outreach with the public and stakeholders to encourage reporting of suspect beetles and compliance with the movement restrictions.

Traps were placed at the same locations as 2017 positive traps and throughout the Lower Mainland and Fraser Valley at various densities based on distances from 2017 positives. In addition, a delimitation survey was carried out around the singleton positive trap on the University of British Columbia campus. Additional traps were placed around new positives detected outside of the regulated area if there was a high likelihood of adult beetles still flying. In these cases, high numbers of traps were placed around the positive trap strategically in areas of suitable turf sites.

A total of 2,088 traps were placed throughout the Province, 8,276 beetles were captured (See figure 5) and the majority were again found around False Creek. This increase in beetles from 2017 to 2018 was expected because treatments applied by the province and the City of Vancouver in 2018 targeted the next generation of developing larvae. The CFIA detected JB in 12 traps outside the regulated area but still within the city of Vancouver. A single beetle was also found in south Delta.

In early 2019, the JB regulated area was expanded to include downtown Vancouver, the West End, Stanley Park, and part of Kits Point near Vanier Park.

Click on image for larger view
Figure 5. 2018 Japanese beetle positive detection sites. Description follows.

Figure 5. 2018 Japanese beetle positive detection sites

The map shows the Lower Mainland, in British Columbia and trap locations in that area for 2018 are identified using blue circles for the negative sites and red circles for positive sites. The regulated area for Japanese beetle is represented by a zone with a pattern of red diagonals. In 2018, positives sites have been found in the Vancouver area only. One insert map on the top left shows details of trap locations north of the Lower Mainland and one insert map on the top right shows the details of the positive locations in Vancouver.

Japanese beetle detection history in the City of Vancouver and the rest of British Columbia

As a result of detecting Japanese beetle in the False Creek area of Vancouver in 2017, the CFIA carried out enhanced surveillance for Japanese beetle in BC from 2017 to 2020. In 2017, the CFIA placed 1,425 traps (see Figure 6) throughout the province but most traps were placed in the City of Vancouver to delimit the False Creek detections and the single detection on the University of British Columbia campus. The rest of the Lower Mainland and Fraser Valley were monitored at a relatively higher trap density to see if Japanese beetle was present in these areas too. In 2017, a total of 958 Japanese beetle in 42 traps were found with approximately 90% of beetles found in and around David Lam Park adjacent to False Creek (see Table 1).

Click on image for larger view
Figure 6. 2017 Japanese beetle trap distribution and positive detections in Vancouver, BC. Description follows.

Figure 6. 2017 Japanese beetle trap distribution and positive detections in Vancouver, BC.

The map shows southern British Columbia, from Prince George to the border with the United States and trap locations for 2017 are identified using blue triangles for the negative sites and red circles for positive sites. In 2017, positives sites have been found in the Vancouver area only. An insert map shows the details of the positive locations in Vancouver.

Table 1. Japanese beetle trapping results in BC
Year Number of Japanese beetle traps placed Result
(number of Japanese beetle detections)
2020 2507 detection and delimitation traps 214 in 39 traps
2019 2344 detection and delimitation traps 1157 in 51 traps
2018 2088 detection and delimitation traps 8276 in 98 traps
2017 1425 detection and delimitation traps 958 in 42 traps
2016 505 detection traps No Detections
2015 442 detection traps No Detections
2014 367 detection traps No Detections
2013 278 detection traps No Detections
2012 331 detection traps No Detections
2011 282 detection traps No Detections
2010 545 detection traps No Detections
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