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Mosquito Control and Beneficial Pollinators: What You Should Know

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The International Union for Conservation of Nature 最近,世界自然保护联盟(IUCN)将帝王蝶(以其醒目的橙色和黑色图案以及每年的迁徙而闻名)列入了世界自然保护联盟濒危物种红色名录TM.  黑脉金斑蝶加入了这一名单上的有益传粉者,由于许多因素,包括除草剂和杀虫剂的滥用,它们受到威胁或濒临灭绝.

So, 现代蚊子控制方法如何避免伤害这些传粉媒介,同时仍然保护公众健康?

Why Beneficial Pollinator Populations are Struggling

Closeup of bee on flower

To start, 在一长串的威胁和挑战中,有益的传粉媒介种群已经挣扎了一段时间. While the below factors have led to a gradual decline in populations, other catastrophic events, such as an infectious disease carried byvarroa mite larvae that wiped out 44% of managed bee colonies between 2015 and 2016, have also been devastating, helping lead to these dangerously low population levels.

While no single issue can be pinpointed as the sole contributor to this decline, some of the interconnecting factors include:

  • Threats from invasive pests and disease
  • Loss of habitat, often through urban or rural development
  • Changing climates, rising temperatures, droughts and other unprecedented weather events
  • Migratory challenges due to loss of native plants and overwintering habitats
  • Exposure to herbicides, pesticides and other chemicals

Reading this, 可以理解为什么居民会质疑他们社区的蚊子控制计划的优点. However, when implemented properly, integrated mosquito management programs should not be expected to harm beneficial pollinators.

Why is Mosquito Control Needed Today?

Mosquito control helps improve quality of life in communities, 大多数控制蚊子的努力和治疗都集中在保护公众健康免受蚊子传播疾病的侵害.

Some mosquito species can carry vector-borne diseases, or diseases spread by organisms that transmit infectious pathogens between humans or animals. These diseases include viruses like West Nile, Zika, Eastern equine encephalitis or dengue, as well as parasites such as malaria.  The mosquito is often called the world’s deadliest animal, and for good reason – mosquito-borne diseases account for over 700,000 deaths annually around the world, according to the World Health Organization (WHO)

The most effective community-wide mosquito control programs follow the principles of integrated mosquito management – a holistic approach recommended jointly by the EPA and the CDC that involves leveraging five different management strategies. They include:

  • Community education focused on breeding source reduction and personal protection efforts;
  • Surveying and mapping across a community for potential and known mosquito breeding sites;
  • Surveillance to monitor local mosquito populations and detect the presence of arbovirus diseases;
  • 用控制幼虫的产品处理孳生地点,防止蚊子幼虫变成叮咬的成虫;
  • 超低体积成蚊控制喷雾治疗,提供即时缓解叮咬或携带疾病的成年人口.

Mosquito ULV Spraying and Resident Concern for Pollinators

Ultra-Low Volume (ULV) spray treatments are commonly used for wide-area mosquito control, with equipment mounted on trucks, all-terrain vehicles, or aircraft. Of all the integrated mosquito management strategies, 这种类型的处理通常在社区中最明显,并且引起居民对传粉媒介影响的最关注.

You can learn more about ULV mosquito spraying here, but below are the basics on how ULV spray treatments work:

  • 紫外线喷雾机将液体灭蚊产品转化为由微小液滴组成的超细喷雾雾.
  • These droplets form a spray cloud, and move with the air, 因此,这些飞沫可以与飞行的成年蚊子进行物理接触,并传递有效剂量的杀虫剂.
  • The product will remain active in the air column for 5-30 minutes, based on weather conditions, before beginning to dissipate and breakdown rapidly.

An electric ULV sprayer on the back of a truck

How ULV Mosquito Spraying Affects Pollinators

To avoid adverse effects to pollinators from ULV mosquito spraying, several key actions come into play from a product and application standpoint:

  1. Products used for ULV mosquito spraying are EPA-registered, highly refined product formulations that often contain very small amounts of the active ingredient. Prior to registering a product, the EPA evaluates products thoroughly to be sure that when used according to label directions, they will not harm people, non-target species or the environment.
  2. 应用分散非常少量的产品在一个地区-通常大约一盎司的配方产品每英亩土地. For comparison’s sake, one ounce is about the volume of liquid held in a shot glass, and a land acre is roughly equivalent to a football field. The dose is extremely low because that’s what works on mosquitoes given their size and weight.
  3. 灭蚊产品的液滴必须与蚊子的身体发生物理接触才能生效——通常是攻击昆虫的神经系统,从而导致死亡. They work quickly to reduce adult mosquito populations active at the time of treatment, and do not have any residual (lasting) effect.
  4. To be as effective as possible without harming beneficial pollinators or other non-target insects, 治疗通常在黄昏或黎明开始,这时蚊子在空气中最活跃,有益的传粉媒介也在休息.

也有大量的实地和业务研究表明紫外线灭蚊的应用, when conducted according to all product label guidelines, do not present a material risk to pollinators, even in cases of direct exposure. For example, 路易斯安那州立大学进行的实地研究发现,使用四种不同的epa注册产品进行ULV治疗可以控制蚊子, including Clarke’s Duet formulation, do not harm honey bees, even when sprayed at the highest label rate and with applications made as close as 50 feet away. This is important research, 因为它桥梁的实验室模型暴露于有效成分的实际操作条件与配方产品.

How ULV Mosquito Product Residue Affects Pollinators

Exposure to product residues within a treatment area is another potential concern for pollinators. 通过超低紫外线设备应用的灭蚊产品旨在限制在治疗区域内的沉积, 但有一个标准的研究方案(称为“25%死亡率的残留时间(RT25)”)用于评估残留对蜜蜂的毒性. RT25 study results on file with the U.S. EPA for the Duet formulation (containing the active ingredients, Prallethrin and d-Phenothrin, 品牌名称Sumithrin),表明在处理区域内叶子上残留的ULV液滴在施用后3小时内无毒, 即使在蚊子控制的最高应用率下,即使直接喷雾暴露在植物上(这在现实世界的治疗环境中不会经常发生).  In operational terms, this translates into a high level of confidence that the morning after a mosquito control application, there are very little exposure concerns for honeybees or other beneficial, sensitive insects that forage within a sprayed area.

What Clarke is Doing to Mitigate Effects on Beneficial Pollinators

As a mosquito control service provider and products manufacturer, Clarke is ultimately responsible for stewarding mosquito control applications made with our products, in accordance with the product label.

In addition, 我们尽可能与州监管机构就濒危或受威胁昆虫的最佳管理做法进行协调. For example, when our Illinois treatment areas coincide with sensitive, threatened or endangered species habitats, Clarke consults with the Illinois Department of Natural Resources. 这一步骤使Clarke在其公共卫生蚊虫控制工作中遵循的操作处理方案和保护传粉媒介的最佳管理实践保持了良好的一致性.

A nighttime ULV spraying

What Can You Do to Help Monarch Populations?

社区居民可以做很多事情来帮助恢复或维持有益的传粉媒介种群——我们都可以做一些事情来帮助避免进一步的破坏.

Check out some great sources below: