SOUTH AUSTRALIAN MOSQUITO INTELLIGENCE REPORT
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SOUTH AUSTRALIAN MOSQUITO INTELLIGENCE REPORT
No. 60
RELEASE DATE: 27th of November 2017 page 1 of 5
MOSQUITO TRAPPING AND ABUNDACE SUMMARY:
• River Murray (RM): Trapping for this season started on August 30th 2017 and includes the seven district
councils of the Murray River. So far, four trips have been completed during this monitoring season and
140 traps have been set. The next trip is set to commence on the 28th of November 2017. From his most
recent trip, Stephen Fricker has commented that “Over the month of November mosquito populations
remained low in the upper sections of the river and continued to decline in the lower river. This was
particularly evident in the trap sites adjacent to the lower lakes such as locations within the Alexandrina
and Coorong council. With summer approaching it is expected that populations of Aedes
camptorhynchus will continue to decline although recent rain may result in a short halt in this decline
particularly in the lower river. In the upper river mosquito populations may be affected by increased
river flows due to environmental allocations. The rain experienced should not have a significant impact
on mosquito populations, however follow up rains may be a cause of concern.”
• Urban Wetlands : Trapping for this seasons Urban Wetland monitoring program has commenced on the
23rd of October 2017. Again this season each trip a total of 37 traps are set across the twelve wetland
sites. No positive larvae sites were detected on the second trap run for this season. All potential larvae
sites are continuously monitored through out the season. The next monitoring trip is set to commence
on the 4th of December. Aedes notoscriptus was the most dominant species caught across most of the
wetland sites on the November trap run with a total of 17 adult females caught followed by Anopheles
annulipes with a total of 16 adult females captured.SOUTH AUSTRALIAN MOSQUITO INTELLIGENCE REPORT
No. 60
RELEASE DATE: 27th of November 2017 page 2 of 5
WEATHER FORECAST:
Overall warmer than average minimum and maximum temperatures were reported for spring. Rainfall for
spring 2017 was near average to below average across the state. In November 2017, the approximate
mean river height at Morgan was 3.14m, an increase of 0.01m from last month. The weather forecast for
the RM regions for December, January and February shows a prediction of average to slightly above
average rainfall with a 45-55% chance of exceeding the median minimum rainfall in the respective
regions. There is a 60-70% chance of exceeding the median maximum temperature and a 55-60% chance
of exceeding the median minimum temperature for the RM regions (www.bom.gov.au).
Mosquito trap collection summary for November 2016 and November 2017
1400
1200
Mean adult female abundance per trap
1000
800
600
400
200
0
2016 2017 2016 2017 2016 2017 2016 2017 2016 2017 2016 2017 2016 2017
Renmark- Berri- Loxton Mid Murray Murray Alexandrina Coorong
Paringa Barmera Bridge
Figure 1: Mean numbers of adult mosquito females per trap caught at seven different locations during November 2016 (blue) and
November 2017 (green). Note the mean numbers of adult mosquito females caught at most of the sites this season were very small
compared to last season.SOUTH AUSTRALIAN MOSQUITO INTELLIGENCE REPORT
No. 60
RELEASE DATE: 27th of November 2017 page 3 of 5
Mosquito trap collection summary for the twelve urban wetlands for the month of November 2017
7
Mean adult female abundance/trap
6
5
4
3
2
1
0
Figure 2: Mean numbers of adult mosquito females per trap caught at the twelve wetland sites during November 2017. Note no female
mosquitoes were caught at Oaklands Park ,Grange Golf Club, or the Warriparinga Wetland sites.SOUTH AUSTRALIAN MOSQUITO INTELLIGENCE REPORT
No. 60
RELEASE DATE: 27th of November 2017 page 4 of 5
ROSS RIVER VIRUS RISK FORECASTS FOR Dec 2017-Feb 2018 from RR Forecaster:
The next three months predicted to be ABOVE AVERAGE RISK period for Ross River virus activity for
the Lower river region:
Upper RM risk for Dec-Feb: The predicted incidence rate for summer in the upper Valley in SA is 0
per 100,000 population. The predicted number of notifications for the region for the next three
months is 0, (95% confidence 0-7). This does not constitute above-average risk.
Mid RM risk for Dec-Feb: The predicted incidence rate for summer in the middle Valley in SA is 0
per 100,000 population. The predicted number of notifications for the region for the next three
months is 0 , (95% confidence 0-54). This does not indicate above-average risk.
Lower RM risk for Dec-Feb : The predicted incidence rate for summer in the lower Valley in SA is
338 per 100,000 population. The predicted number of notifications for the region for the next
three months is 20, (95% confidence 0-39). This does indicate above-average risk.SOUTH AUSTRALIAN MOSQUITO INTELLIGENCE REPORT
No. 60
RELEASE DATE: 27th of November 2017 page 5 of 5
MOSQUITO VIRUS TESTING:
14 FTA cards have been send off for screening by the ICPMR, Westmead Hospital in NSW
on the 13th of November for the month of November 2017. Results of the October
screening are still being awaited.
Compiled by G Mincham and CR Williams from UniSA
gina.mincham@unisa.edu.au , craig.williams@unisa.edu.au, 08 8302 1813, 08 8302 1906You can also read
