south australian mosquito intelligence report · south australian mosquito intelligence report no....

SOUTH AUSTRALIAN MOSQUITO INTELLIGENCE REPORTNo. 49

RELEASE DATE: 30th of April 2016 page 1 of 9

MOSQUITO TRAPPING AND ABUNDACE SUMMARY:

• River Murray (RM):Trapping for this season started on September 2nd 2015 and included the sevendistrict councils of the Murray River. The final trip for this monitoring season commenced on April 19th

2016. In total, eleven trips have been completed during this monitoring season and 385 traps have beenset. Overall, the mosquito abundance in 2015-2016 at the seven district councils followed a similarpattern as the one for the previous monitoring season in 2014-2015. However, an increase in abundanceearly in the season can be seen in Murray Bridge and Alexandrina showing the greatest increase inOctober and December respectively (Figure 1).

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Murray BridgeMurrayBridge 2014-2015MurrayBridge 2015-2016



Figure 1: The average number of adult mosquitos per trap caught each months during monitoring season 2015-2016 (blue) and season 2014-2015 (green) for the River Murray Councils.

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Mid-Murray2014-2015

Mid-Murray2015-2016

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Alexandrina2014-2015

Alexandrina2015-2016

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CoorongCoorong2014-2015

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• From his most recent trip, Stephen Fricker has commented that “The final surveillance trip of the seasonwas conducted in mid April. Conditions failed to produce any significant numbers of adult mosquitoes inthe upper river councils. Many larvae sites in the upper river councils were investigated and found to bedry. However, a number of known problem larvae sites of the spring mosquito Aedes camptorhynchuswhere pre-treated with S-methoprene. In the lower river council’s adult mosquito numbers were higherwith long term April averages exceeded in the Rural City of Murray Bridge and Coorong Councils. Thesehigh mosquito numbers are due to high numbers at specific sites. Conditions over winter will bemonitored and the need for winter treatment assessed. “

Mosquito trap collection summary for April 2015 and April 2016

Figure 2: Mean numbers of adult mosquito females per trap caught at eight different locations during April 2015(blue) and April 2016(green)

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WEATHER FORECAST:Overall South Australia experienced a warmer and drier than normal April. Both mean maximum andminimum temperatures above long-term averages. This April has been the warmest on record since2013. In April 2016, the approximate mean river height at Morgan was 3.09m, a small decrease of 0.05from March 2016. The weather forecast for the RM regions for May, June and July shows a prediction ofabove average rainfall with a 65-75% chance of exceeding the median minimum rainfall in the respectiveregions. There is a 35-55% chance of exceeding the median maximum temperature and a 65-80% chanceof exceeding the median minimum temperature for the RM regions (www.bom.gov.au).

• Urban Wetlands : Trapping for this seasons Urban Wetland monitoring program began on the 12th ofOctober 2015 and includes thirteen wetland sites across Adelaide. Each trip a total of 39 traps are setacross the thirteen sites over a total of 6 trips. A similar trend in adult female mosquito abundancecan be seen for this monitoring season 2015-2016 as that for monitoring season 2014-2015.However, overall lower numbers of adult female mosquitoes were recorded this season with onlysome sites showing slight increases in numbers later in the season in February and March 2016 dueto short heavy periods of rain (Figure 3). An overall total of 823 adult female mosquitoes was caughtwith Ae. notoscriptus being the most dominant species across all sites making up 47.4 %.

http://www.bom.gov.au/



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Royal AdelaideGolf Club2014-2015

Royal AdelaideGolf Club2015-2016

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Glenelg GolfClub 2014-2015

Glenelg GolfClub 2015-2016



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Grange GolfClub 2014-2015Grange GolfClub 2015-2016

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Unity Park

Unity Park2014-2015

Unity Park2015-2016

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Adelaide Botanical Gardens AdeladieBotanicalGardens 2014-2015AdeladieBotanicalGardens 2015-2016

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Ridge Park2014-2015Ridge Park2015-2016

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Old Port Road

Old Port Road2014-2015

Old Port Road2015-2016



Figure 3: The average number of mosquitos per trap caught each months during the trapping season 2014-2015 (green) and season 2015-2016 (blue) at each of the thirteen locations . Note trapping concluded in March this season and only commenced in November the previous season.

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WestLakes/CookeReserve 2014-2015

WestLakes/CookeReserve 2015-2016

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Felixstow2014-2015Felixstow2015-2016

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Max Amber ReserveMax AmberReserve 2014-2015

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St Claire2014-2015

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Compiled by G Mincham and CR Williams from UniSA

[email protected] , [email protected], 08 8302 1813, 08 8302 1906

ROSS RIVER VIRUS RISK FORECASTS FOR May –July 2016 from RR Forecaster:

The next three months are predicted to be ABOVE AVERAGE RISK period for Ross River virus activityfor the Upper RM regions:

Upper RM risk for May-Jul: The predicted incidence rate for autumn and early winter in the upperValley in SA is 10 per 100,000 population. The predicted number of notifications for the region forthe next three months is 1, (95% confidence 0-13). This does constitute above-average risk.

Mid RM risk for May-Jul : The predicted incidence rate for autumn and early winter in the middleValley in SA is 0 per 100,000 population. The predicted number of notifications for the region forthe next three months is 0 , (95% confidence 0-10). This does not indicate above-average risk.

Lower RM risk for May-Jul : The predicted incidence rate for autumn and early winter in the lowerValley in SA is 0 per 100,000 population. The predicted number of notifications for the region forthe next three months is 0, (95% confidence 0-34). This does not indicate above-average risk.

mailto:[email protected]


MOSQUITO VIRUS TESTING:

The most recent results from the FTA card screenings from ICPMR, Westmead Hospital inNSW have shown no positives. The last 20 FTA cards for this season have been sent of forvirus screening on the 27th of April 2016.



Compiled by G Mincham, CR Williams and Stephen Fricker from [email protected], [email protected], [email protected]: 08 8302 1906 or 08 8302 1813




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