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This subweb, Integrated Pest Management, consists of several web pages:
IPM-2 Mosquito control in Mt. San Antonio Gardens
IPM-5 Integrated Pest Management and One Health
Mosquito Control Working Group
Conservation & Sustainability Committee
Mt. San Antonio Gardens
900 E. Harrison Avenue, C4
Pomona, California 91767
Contact: Ted Trzyna. Please use email: tedtrzyna@gmail.com
[Opinions expressed are my own - TT]

Europe's record mosquito-borne disease activity could signal new normal (CIDRAP)
BEYOND PESTICIDES
ENVIRONMENTAL WORKING GROUP
To be done
Insecticides Used in Water. Bacillus thuringiensis subspecies israelensis (Bti) is a bacterium that forms spores which produce proteins toxic to mosquito larvae. To be effective, mosquito larvae must eat the compounds, which act as a stomach poison that damages mosquito midgut cells. Like the closely related forms of Bt used by gardeners to control specific insect pests, Bti is highly selective, killing only mosquitoes and the larvae of a few other related flies. This biopesticide is not effective against pupae, since they don’t feed. Bti is marketed in a variety of formulations for the homeowner, the most common being Mosquito Dunks which last for about 30 days in water.
Methoprene is an insect growth regulator (IGR), a mosquito hormone mimic that is applied to standing water and inhibits the emergence of adult mosquitoes. Examples of commercially available formulations include Altosid Pro-G and Pre-Strike Mosquito Torpedo. Spinosad is a neurotoxin produced naturally by some bacteria and is used as an insecticide against many types of insects. For mosquito control, it is sold as Natular DT and appled to standing water.
I Outdoor Sprays. Using insecticide sprays or outdoor foggers for controlling adult mosquitoes has limitations. While they can provide a temporary reduction of the adult population—which can be useful if you make the application shortly before a backyard picnic or family gathering—alternative, more long-term approaches for controlling mosquitoes are preferable. Equipment for applying outdoor sprays is expensive and complex. The use of systems that continuously release small amounts of insecticides is not recommended. Regardless of the product that you choose to use against mosquitoes, always follow the instructions for the amount and appropriate habitats for use found on the product’s label. It is a violation of federal law not to follow the instructions on the label!
Probably the best way to protect yourself from mosquito bites is to avoid places where their densities are high and avoid being outside when mosquito activity is at its highest. In mountainous areas, most mosquito species bite during morning and afternoon hours and often not at all when it is dark. In some low-elevation areas, such as the Central Valley, some mosquitoes tend to bite at night, while others bite during the day. Here are some ways to protect yourself from mosquito bites:
Repellents. If you find yourself in a situation where you can’t avoid mosquitoes, first minimize the amount of exposed skin surface by wearing a hat or head net, long trousers, and a long-sleeved shirt. Some mosquitoes will bite through lightweight clothing, but the number of bites you receive will decrease if you cover most areas of your body. When mosquito densities become very high, it is best to apply a mosquito repellent. The Centers for Disease Control and Prevention (CDC) recommends using products containing active ingredients registered by the U.S. Environmental Protection Agency (EPA) for use as repellents applied to skin and clothing. An EPA registration indicates the active ingredients of repellents have been tested for human safety when applied according to the instructions on the label. The CDC currently recommends two general types of repellents for use on skin: conventional and biopesticide repellents. Conventional repellents include compounds such as DEET (N,N-diethyl-m-toluamide or N,N-diethyl-3-methyl-benzamide) and Picaridin (KBR 3023: 2-[2-hydroxyethyl]-1-piperidinecarboxylic acid 1-methylpropyl ester). DEET and Picaridin are used most commonly to repel mosquitoes. Biopesticide repellents are derived from natural materials or are synthetic versions of the natural product. The synthetic form of oil of lemon eucalyptus (OLE: use only when formulated as a repellent. The pure form of OLE is not currently registered by the EPA.) and IR3535 (3-[N-Butyl-N-acetyl]-aminopropionic acid, ethyl ester) are two recommended biopesticide repellents. A synthetic alternative to natural OLE is PMD (para-menthane-3,8-diol) and is recommended by the CDC. PMD isn’t recommended for use on children younger than 3 years old. These repellents are available at retail outlets under different product names: the active ingredient and its percentage in the formulation are listed on the label of each product. New repellents are continually being developed and tested. The federal government’s latest recommendations for mosquito repellents can be found on the CDC’s website: wwwnc.cdc.gov/travel/yellowbook/2020/noninfectious-health-risks/mosquitoes-ticks-and-other-arthropods and EPA’s website: www.epa.gov/insect-repellents. A repellent’s effectiveness and duration of protection vary considerably among products and mosquito species. Effectiveness typically lasts 4 or fewer hours depending on wind, high temperatures, high humidity, and perspiration amounts. In general, higher concentrations of active ingredient provide a longer protection time, regardless of the active ingredient, although concentrations greater than 50% don’t offer a marked increase in protection time. Products with less than 10% active ingredient might offer only limited protection, often only 1 to 2 hours. Products that offer sustained release or controlled release (micro-encapsulated) formulations, even with lower active ingredient concentrations, might provide longer protection times. Regardless of which product you use, if you start to get mosquito bites, reapply the repellent according to the label instructions or remove yourself from the area if possible. DEET is the most effective mosquito repellent if you will be out for long periods where mosquitoes are abundant. However, DEET is an irritant to some people, and repellents containing high DEET concentrations can damage synthetic materials such as clothing or plastics. Apply sparingly to all exposed skin. Special formulations for children contain low concentrations of the chemical in an oil-based medium that slowly releases the compound and limits its absorption through the skin; these formulations also work well for adults. If you wish to avoid DEET, many of the EPA-approved alternative repellents are as effective or are more effective for some people than are low concentrations of DEET, especially when only short-term repellency (fewer than 2 hours) is desired and mosquitoes aren’t very abundant. In addition to the previously mentioned repellents, plant oils such as those from birch, bluestem grass, geranium, pine, rosemary, spearmint, yarrow, lantana, and neem somewhat repel mosquitoes; but most aren’t available in commercial mosquito repellents. The insecticide permethrin functions as a repellent when applied to clothing, but it should never be applied directly to skin. The EPA recommends several precautions when using insect repellents.
Other Repellent Products. Research has shown that the effectiveness of most other products marketed to repel mosquitoes differs appreciably. Some products such as clip-on dispensers emitting metofluthrin which kills and repels mosquitoes have shown some promise in limited studies. Manufacturers claim that clip-on, battery-operated dispensers for the pyrethroid pesticide metofluthrin repel mosquitoes for up to 12 hours per refill; but like most repellents, effectiveness varies among users. Wristbands that contain an aromatic repellent, ultrasonic emitters, electric grids, electronic repellers, aromatic plants (the most common one is the so-called mosquito plant, Pelargonium x citrosum), incense coils, vitamin B1, and mixtures of brewer’s yeast and garlic are ineffective. Oil of citronella, which is extracted from Andropogon nardus, has a reputation for repelling mosquitoes. Burning citronella candles or mosquito coils containing allethrin works best if there is relatively little air movement, but these products are only for use outdoors.Mosquito and Vector Control Agencies The goal of mosquito management is to keep populations below levels where they become a nuisance or a public health problem that leads to an outbreak of disease. Mosquito manageCANDLES, COILS, AND BATTERY-POWERED DIFFUSERS
PATCHES, STICKERS, WRIST AND ANKLE BANDS, ETC.
Consumer Reports tested three methods for controlling mosquito activity in a large outdoor area: citronella candles, an oscillating pedestal fan, and a battery-powered area diffuser that emitted geraniol, a natural repellent derived from plants. CR found that "the fan is far more effective than citronella candles or the geraniol diffuser. . . . While a fan makes it more difficult for mosquitoes to fly against the steady breeze, it also helps disperse the carbon dioxide we emit when we breathe -- a good thing because mosquitoes use carbon dioxide as a guide to finding humans when they’re looking to feed." www.consumerreports.org Mosquito repellent coils, which burn over many hours, were not included in this CR project, but are given mixed reviews elsewhere. Patches, stickers, and wristbands containing mosquito repellents are effective only where they meet the skin.
USE BIOLOGICAL CONTROL AGENTS IN THE KOI PONDS
See the
If mosquitoes become an issue,
the pond can be treated with “dunks”
or briquettes of a biological control
agent called Bacillus thuringiensis is-
raelensis, or Bti. This bacterium pro-
duces a crystalline protein toxin that
disrupts the guts of mosquito larvae
that eat it, killing them before they can
develop into adults. Bti is only toxic to
members of the order Diptera (true
flies), so be aware that other groups such as beneficial non-biting midges and crane flies can
also be affected. Mosquito and midge larvae are an important food source for many pond-
dwelling animals, so consider very carefully whether, when, and how frequently treatment
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