September 2010 Turlock Mosquito by fjzhangxiaoquan


									Agenda Item: 7

                       Turlock Mosquito Abatement District
                             Manager’s Report
                             September-- 2010

A. Introduction:

        Weather during the month was warm with temperatures ranging below normal with no
rainfall. Averaged daytime highs and nighttime lows for the month were 1.5°F below the five-year
average of 74°F. Daytime highs ranged from 71°F to 99°F for an average of 88°F. Nighttime lows
ranged from 51°F to 67°F for an average of 57°F. Daytime highs and nighttime lows for September
2009 were 91°F and 63°F respectively.

        Rainfall for the month was .00”. Total rainfall for this year is 0.00”. Rainfall
total for last year was .13”. The normal seasonal rainfall is .21”.

B. Mosquito Prevalence:

        Overall adult mosquito occurrence was at or below the 5-year average through out the
District. The most prevalent mosquito controlled in September was the house mosquito, Culex
pipiens (69%) followed by encephalitis mosquito, Culex tarsalis (13.6%) ; the pasture mosquito,
Aedes nigromaculis (12%); Flood water mosquito, Aedes melanimon (5%). Dispersal flight
increased in September with more house mosquitoes moving into locations to overwinter as adults
such as around residences and parks. Adult mosquito activity was noticed around residential
properties District wide in September. Flooding for waterfowl habitat southeast of Newman
increased mosquito populations resulting in more adult mosquitoes to begin moving into Newman
and along the San Joaquin River. The same held true for the Grayson area where several private duck
clubs exists along the Old San Joaquin River Channel.

               Light Trap Summary – Female Index

Location No.                                C. tarsalis                    All Species

Turlock                          1               .20                          .60
Turlock                          2               .10                          .60
Newman                           3               .30                          .50
Patterson                        4               .10                         .30
South Modesto                    5               .50                         1.00
Ceres                            6               .10                          .30
Hughson                          7               .00                          .50
Denair                           8               .20                         2.30

September 2010Average                         .20                            0.80
September 2009Average                         .20                            1.40
5-Year Average                                .10                            1.00

C. District Operations:

         Field personnel continued making routine inspections and treatments. The District treated a
total of 20,253 acres, 15,754 acres less than last September, to control both adult and immature
mosquito stages. District personnel conducted wide area adulticiding operations in locations where
WNV was detected or mosquito populations exceed treatment thresholds. District personnel in
coordination with Fish and Game personnel treated China Island refuges for immature mosquito
stages based upon the refuges flood-up schedule. The same holds true with those duck clubs located
near Grayson. Best Management Practices for mosquito control were observed in the waterfowl
flood-up locations through out the District.

       District personnel made spot inspections of catch basins and have found that the insect growth
regulator that was placed in them in mid-June is still controlling mosquito larvae. In October District
personnel plan to re-check catch basins for signs that the briquettes are beginning to fail. Depending
upon weather conditions the District may not need to treat the catch basins this fall.

        Detection of backyard sources in residential areas continued to be a major problem in
September. District personnel made inspections of swimming pools and hot tubs that either the
District planted mosquito fish in to control breeding or were treated earlier in the year. Some of the
pools where mosquito fish were previously planted were breeding and the mosquito fish were not
present. In those situations the pool is treated to control mosquito breeding and then fish are
restocked back into the pool. Most of the pools were being maintained properly and were not
breeding mosquitoes.

         District personnel also treated 119 dairy ponds to control weed growth. The majority of
treatments made in September were to control new weed growth. Twenty-five (25) ponds were
treated in an attempt to control hairy fleabane. This weed species is difficult to control especially
once the flower head begins to develop. This year weed control around the dairy ponds has been
exceptionally good. The net result is that diary ponds have rarely needed to be treated to control
mosquito breeding. Billings for weed control participants will be go out at the end of October for
the 2010 program year. Sign-ups for 2011 are scheduled to begin around mid-November.

        During September there were no human cases reported in the District with WNV infections;
34 mosquito samples tested positive for WNV out of 375 tested; 2 wild dead birds tested positive for
WNV with one (1) having a chronic infection out of four (4) collected; thirteen (13) chickens from 3
flocks tested positive for WNV. The Dyksuel trap accounted for the majority of the infect chickens.
In Stanislaus County there have been 8 human infections with WNV with the majority of infections
having the nueroinvasive disease. There have been 3 human infections detected in the District so far
this year.

        District personnel will be attending the Northern San Joaquin Valley Regional Continuing
Education program at the San Joaquin County Agricultural Center on October 7, 2010. The Region
holds joint continuing education programs to insure that all District employees maintain their
mosquito technician certification.

      District personnel answered 54-service request in September as compared to 101 for
September 2009. The five-year average is 76 service requests for September. The District received
complaints about suspected swimming pools that might be breeding mosquitoes as well as people
concerned about mosquitoes around their residence that might be carrying West Nile virus. In most
cases the District was able to respond to complaints within a 24 hour period. Over the past several
years the District has observed an increase in requests for service. As development occurs and people
integrate into the District there have varying expectations regarding the level of mosquito control.

       The District laid off Seasonal Mosquito Control Assistants Carl Lasiter and Dan Goodwin on
September 30, 2010. During October District personnel will begin to take time off as the season
slows down.

D. Material Used and Type of
                              SPOTS       LARVICIDING    ADULTICIDING      AIRCRAFT
     MATERIALS                 UNIT         GROUND       COLDFOGGING

     CATCH BASINS               0

                            ACRES            835.6          19,322.6          95
                           Total Acres      20,253.2

     A.L.L.                   Gallon            3.1
     Agnique MMF              Gallon            0.5
     Altosid XRG              Pound             760
     BVA2 Oil                 Gallon           579.6
     G. B. 1111               Gallon           481.5
     Vectobac 12AS            Gallon           32.5
     Vectolex WDG             Pound            36.6
     VectoMax CG              Pound              50                           475
     Aquahalt                 Gallon                          18.1
     DUET                     Gallon                           4.1
     MGK 12%                  Gallon                          26.7
     Aqua-Anvil               Gallon                          11.9


     DAIRY PONDS               119                         13.1 acres

                            MATERIAL      AMOUNT USED

                            Goal 2XL         4.0 gals.
                          Milestone VM      0.50 gals
                           AquaMaster       0.50 gals
                             Reward         0.20 gals
                           Crop$mart        15.4 gals.

F.   FISH PLANTS            14                        1.61 acres

                           TYPE         ACRES         HOURS
                        Agricultural     0.00          0.00
                         Industrial      1.03           .15
                          Wetland         .00           .00
                         Domestic          .58         0.60

G. SERVICE                  54         101(2009)      76(5-year
   REQUEST                                            average)

   EMPLOYEES               15
                         HOURS         REGULAR       OVERTIME
     ADMINISTRATION       307.5          307.5           0
     FOREMAN              168.5           168           0.5
     Vector Ecologist     167.5          167.5          0.0
     MECHANIC                0                0          0
     CONTROL OPER.        1,709.0          1,692.0      17.0
     TOTAL HRS           2,352.50          2,335.0      17.5

                                                     September 2010


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