First: if your street isn’t sprayed, don’t think you don’t need to take precautions. A DeltaGard applicator specialist working with Bayer products and with several decades’ experience in the business tells us the spray can drift 300 feet and does not tend to dissipate into the air. Of course, exactly where it goes depends on wind direction and speed.
Now on to the manufacturer’s (that’s Bayer) label. Download it here: DeltaGard [label – mosquitos]. Note that this is specifically for the wide-area mosquito spray; other labels may pertain to other DeltaGard products. They all have deltamethrin as the Active Ingredient, but concentration and added ingredients may differ. See our earlier remarks on DeltaGard here.
Not easy reading but let’s focus on:
• to control adult mosquitoes, black flies, gnats, non-biting midges, stable flies, horse flies, deer flies, sheep flies, horn flies, and nuisance flying insects such as houseflies or blow flies.
It’s hard to love all those insects, but let’s point out that they are part of nature and are important food sources for birds, other insects, reptiles, and amphibians. And those others flying around outdoors have no health implications for people.
• For best results, apply when insects are most active and meteorological conditions are conducive to keeping the spray cloud in the air column close to the ground. An inversion of air temperatures and a light breeze is preferable. Application during the cooler hours of the night or early morning is recommended. Apply when wind speed is equal to or greater than 1 mph.
Who has an anemometer when you need one? If you do, please set it up! And how do we tell if there is a temperature inversion (meaning warmer air over cooler air)? Of course, those who wish the spray to remain concentrated at ground level want an inversion; the rest of us would be happy with the normal pattern, causing the spray to dissipate more rapidly. Meteorologists needed!
This product is extremely toxic to fresh water and estuarine fish and invertebrates. Runoff from treated areas into a body of water may be
hazardous to fish and aquatic invertebrates.
Do not apply over bodies of water (lakes, rivers, permanent streams, natural ponds, commercial fish ponds, swamps, marshes, or estuaries),
except when necessary to target areas where adult mosquitoes are present, and weather conditions will facilitate movement of applied
material away from the water in order to minimize incidental deposition into the water body. Do not contaminate water when disposing of
equipment rinsate or wash waters.
When used for mosquito adulticiding;
This pesticide is highly toxic to bees exposed to direct treatment on blooming crops or weeds. Do not apply this product or allow drift when
bees are foraging the treatment area, except when applications are made to prevent or control a threat to public and / or animal health
determined by a state, tribal, or local health or vector control agency on the basis of documented evidence of disease causing agents in
vector mosquitoes, or the occurrence of mosquito-borne disease in animal or human populations, or if specifically approved by the state or
tribe during a natural disaster recovery effort.
Please record any application over or next to bodies of water! 9/11/18 is shaping up not to meet the condition that “weather conditions will facilitate movement of applied material away from the water in order to minimize incidental deposition into the water body.”
If there are, as forecast, thunderstorms, they will do the opposite: wash the pesticide, both airborne and deposited on streets and other drainage areas, directly into surface drainage. If this happens, please photo drainage with a time stamp. Those fresh water fish and invertebrates are important ecological factors.
And let’s remember the 300-foot drift area.