If you are seeing hornets coming in and out through cracks in the retaining wall, then a great product to use would be Tempo 1% Dust. You should apply the Tempo 1% Dust with a duster such as the B&G Bulb Duster 1150 and direct the dust into the cracks in the wall where you are seeing the insects enter and exit. You may also want to have Wasp Freeze on hand for quick knockdown of flying insects in the area.
To get into those higher areas, you could use the Dustick Duster applicator. Tempo 1% dust is the most effective dust to treat for hornets and yellow jackets. Be sure to treat in the times of the day when they are less active (earlier morning or later evening). You may also want to use a ready-to-use knockdown insecticide such as PT Wasp Freeze II. This spray will spray up to 15 away for safe and quick knockdown of flying, stinging insects.
Tempo 1% Dust will work great for wasp and will not harm Evergreen Shrubs.
No, Tempo 1% Dust should be used only as directed on the product label as a dry insecticide formulation. You can use either Tempo SC Ultra, Tempo Ultra WP, or Tempo WSP Ultra if you would a concentrate to apply as a spray.
According to the Tempo 1% Dust label, If the product is inhaled do the following.
* move person to fresh air.
* If person in not breathing, call 911 or an ambulance, then give artificail respiration, perferably mouth-to-mouth if possible.
Tempo dust would be a good choice to help control the cicada killers. Tempo dust offers a pretty fast knockdown though you should note that it does not offer an instant knockdown. You may want to consider using a instant knockdown spray such as Eco PCO Jet-X. Eco PCO Jet-X provides instant knockdown and kill of stinging insects. The Jet Spray can be sprayed up to 15 ft. Cicada Killer wasps thrive in disturbed environments, such as landscaped yards and places where bare soil is exposed. You can discourage the wasps from nesting in your yard by cutting your grass on the highest setting and by adding a thick layer of mulch to flower beds during the Cicada Killer Wasp season. These wasps do not like over saturated lawns either, so over watering during their season will help prevent them. Unfortunately there is no fool proof way to prevent cicada killer wasps.
If you know where the nest is you can use a dust such as Tempo dust puffed into the nest or holes using a hand duster and around the opening of the nest. This type of application usually will kill the nest of wasps over the course of a few days.
Ground bees, also known as digger bees, can be very difficult to control no matter what product you use and they most likely will come back to your property year after year unless you do your part to alter your property to make it unfavorable to the bees. Ground bees prefer dry soils with thin grasses so irrigating the area frequently and correcting any issue that causes your grass to be thin will help deter the bees from nesting. In areas where you do not have grass, a layer of mulch will help deter the bees from nesting. Ground bees are solitary bees and are not very aggressive and are known to be a beneficial insect which is why you will not find any products specifically labeled for this type of bee. Talstar P can help provide some level of control but it will not get rid of all of the ground bees on your property. You should use Talstar P at a 1 oz of product to 1 gallon of water for a 1,000 sq ft area ratio. This will give you the fastest knockdown and the longest lasting residual. Talstar P does not offer an instant knockdown but will kill insects that come into contact with treated areas over a short period of time.