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2018 Annual Report Garfield County Cooperative Mosquito Control Program November 2018

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2018 Annual Report Garfield County Cooperative Mosquito Control Program November 2018 2018 Annual Report Garfield County Cooperative Mosquito Control Program November 2018 Vector Disease Control International 7000 North Broadway, Suite 108 Denver, CO 80211 Email: [email protected] Website: www.VDCI.net Garfield County Cooperative Mosquito Control Program TABLE OF CONTENTS PAGE MISSION STATEMENT & OBJECTIVES 3 VDCI IN COLORADO 4 2018 SEASON PERSPECTIVE 5 WEST NILE VIRUS 7 US MAP (2018 HUMAN CASES) COLORADO 2018 HUMAN WNV INFECTIONS BY COUNTY COLORADO MAP 2018 WNV SURVEILLANCE LARVAL MOSQUITO CONTROL 11 VDCI SURVEILLANCE LABORATORY 13 CDC TRAP DATA COMPARISON ADULT MOSQUITO CONTROL 16 PUBLIC RELATIONS & EDUCATION 18 SUMMARY 19 APPENDIX: GRAPHICS AND DATA SUMMARIES 20 2018 AREA CLIMATE DATA CDC TRAP DATA COMPOSITE SUMMARIES ADULT CONTROL DATA YEARLY COMPARISON CHARTS 2018 Garfield County Cooperative Mosquito Control Program Annual Report 2 Vector Disease Control International, LLC Garfield County Mosquito Control Program Mission Statement Garfield County completed its 14th year of cost-effective Integrated Mosquito Management operations in 2018. Many communities across Colorado recognize the need to control mosquito annoyance and the risk of mosquito- borne disease associated with flood irrigation practices, urban development, and snow-melt runoff. Integrated mosquito management operations that utilize environmentally sensitive controls and new technologies can greatly enhance the outdoor experience without negatively impacting the environment. The need to protect residents and visitors from the health risks, severe annoyance and discomfort associated with biting mosquitoes is a chronic annual problem. The primary objective of the Garfield County Mosquito Control Program is to suppress populations of larval mosquitoes in aquatic habitats. VDCI technicians primarily utilize bacterial larvicides that reduce mosquito populations without harming non-target organisms. Additionally, monitoring of adult mosquito populations is an essential component of an Integrated Mosquito Management (IMM) program. Surveillance trapping performed as part of the Garfield County Cooperative program provides data used to assess potential West Nile Virus infection risk, as well as the need for adult mosquito control measures. Data driven rapid response with mosquito adulticide ULV technology can reduce the threat of disease transmission and annoyance associated with mosquitoes. VECTOR DISEASE CONTROL INTERNATIONAL Founded in 1992 with a single contract in central Arkansas, VDCI started with the simple idea to provide municipalities with the products and services needed to run effective mosquito control programs, VDCI now has over 25 years’ experience and offices located throughout the United States. Our mosquito control professionals have more than 100 years in combined mosquito surveillance and control experience. VDCI operates full service surveillance and control programs on the municipal, county and state level. In addition to our many seasonal municipal programs VDCI is capable of quickly deploying anywhere mosquito services are needed, as we have proven during past and recent emergency responses to natural disasters and emerging disease outbreaks in the US and abroad. 2018 Garfield County Cooperative Mosquito Control Program Annual Report 3 Vector Disease Control International, LLC VDCI In Colorado Although VDCI was new to Colorado in 2014 partnerships with Colorado Mosquito Control and Ottertail Environmental brought together the biggest and most experienced mosquito control companies in the state under one name. VDCI now manages mosquito control programs throughout Colorado including Homeowners Associations, Cities and Towns, Mosquito Control Districts and Counties. VDCI currently has seven year-round offices in Colorado with programs that range from the southwest corner of the state to northeastern Colorado. VDCI also has programs in several mountain areas including Aspen, the Gunnison Valley, and the Colorado River valley. Since the inception of The Garfield County Cooperative Mosquito Control Program, efficacy of the established program has been improved through additional mosquito larval site mapping and continued adaptation to ever changing environmental conditions. Current municipal participants in the Garfield County Cooperative Program are: Carbondale, Glenwood Springs, New Castle, Silt, Rifle, Parachute, and Battlement Mesa. VDCI has continued to provide top quality mosquito control programs to the Western Slope and Mountain areas of Colorado. In addition, VDCI has expanded to provide service to other municipalities as new mosquito control programs were initiated. VDCI will maintain its commitment to provide top quality service, to minimize the threat of West Nile Virus to citizens and to reduce mosquito annoyance in Garfield County. 2018 Garfield County Cooperative Mosquito Control Program Annual Report 4 Vector Disease Control International, LLC 2018 SEASON PERSPECTIVE At VDCI we have come to expect each Colorado summer to present a unique set of temperature, precipitation, irrigation, and human interactions that combine to create new and different challenges in both mosquito control and mosquito-borne disease proliferation and control. The 2018 mosquito season started with significantly above average temperatures and below average precipitation in May, beginning a trend that continued throughout the entire summer. Area snow pack levels were below average, but the resulting runoff was still sufficient to fill many mosquito larval brooding sites along riverbanks. The early runoff quickly receded and dropped to alarmingly low levels by mid-July. These low levels presented a unique mosquito brooding opportunity as in some areas as it left small rocky pools of warm stagnate water along the riverbanks that would have been flowing water under normal conditions. In early August there was a period of frequent small rain events that actually amounted to slightly above average precipitation totals for that month in most areas of the county. These rain events also coincided with a late-season resurgence of mosquitoes that fortunately was fairly short lived. September was warmer than normal but also very dry and as nighttime temperatures began to fall mosquito production started to rapidly decrease as well (See Chart “2018 Garfield County Climate Data”). Unlike most past seasons, the majority of the mosquitoes encountered during the 2018 season were of the genius Culex. This was primarily due to below average rainfall, the low water levels in the rivers, high temperatures and reduced irrigation water availability that would normally lead to large hatches of other mosquito types. Culex mosquitoes are associated with older standing stagnant water. These mosquitoes are common in most areas of Colorado and are the primary vector for West Nile Virus. Due to the warm summer temperatures combined with seasonal rains and irrigation 611.15 acres required treatment within Garfield County in 2018 compared with 572.0 acres in 2017. (See Site Comparison by Year in the Appendix). Throughout the summer there were relatively few significant rain events, but high temperatures drove mosquito production in marshlands and other sites that were still holding standing water. Anticipating and understanding weather events and the resulting effect it will have on mosquito populations is one of VDCI’s primary objectives to tailor the perfect program for Garfield County. Cool nighttime temperatures in September resulted in a major decrease of mosquito populations early in the month. The mosquito larval inspection and control season officially came to a close on September 24th as daytime temperatures dropped into the 60’s and 70’s with night time temperatures dropping into the high 30s throughout the control area. 2018 Garfield County Cooperative Mosquito Control Program Annual Report 5 Vector Disease Control International, LLC 2018 Field Activities Field activities began in March for the 2018 season. The earliest activity of the season involved updating and revising GIS maps. In addition, new site identification and mapping was a priority that included mapping several areas that had not previously been included in larval control operations. Mapping larval sites is an ongoing process; every year citizen reports of new areas of standing water, new construction and site changes result in new sites being added or sometimes removed from the existing larval inspection routes. Hiring of seasonal technicians began in April, and continued into May. As the VDCI service area continues to grow, hiring an adequate number of top quality field technicians has become a challenge. For the Garfield County office, over 20 applicants were interviewed with 8 full-time technicians hired; three of which were returning technicians from last year. VDCI’s Annual Field Technician Classroom Training Day took place on Monday, May 21st with over 75 new and returning field technicians in attendance. Field training by VDCI management and veteran employees lasted through the first week of June. By early June, VDCI was fully staffed and had full daytime and evening shift crews fully trained and in the field. During the early June to mid-September time period, field mosquito control operations were in full swing. Mosquito trapping in Garfield County continued through August 29th and soon after cool temperatures and an overall decrease in adult populations effectively eliminated the need for any further trapping and associated adult spraying operations. Before the end of August, mosquito
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