A good treatment of Talstar should help do the trick. However, if the junipers are really thick, then you need to apply quite a bit for the product to get down to the ground where the bees are nesting.
http://www.domyownpestcontrol.com/talstar-talstar-one-p-97.html
Talstar P would be your best general insecticide for your yard. It is labeled for just about any insect you could have a problem with including ants, roaches, beetles, mosquitoes, and many others. Talstar P can be used in a hose end sprayer but can be a little thick so may need a touch of water added to thin it a bit.
If you are looking to get rid of the weeds and grass so you can reseed you should use a glyphosate product such as Glyphosel Pro. This is a non-selective herbicide that will kill the weeds and anything other foliage it is sprayed on. You can reseed after 14 days. Do not directly spray the trees or allow drift to get on the trees to avoid damage.
We recommend using 1 fl oz of Talstar P per gallon of water. Use 2 gallons of solution/1000 square feet, immediate irrigation of treated area with at least 0.25 inches of water following application to ensure efficacy of sub-surface pests such as,
but not limited to, Mole Crickets, is recommended.
Mole Cricket adults: Achieving acceptable control of adult mole crickets is difficult because preferred grass areas are subject to continuous invasion during the early spring by this extremely active stage. Applications should be made as late in the day as possible and should be watered in with up to 0.25 inches of water immediately after treatment. If the soil is not moist, then it is important to irrigate
before application to bring the mole crickets closer to the soil surface where contact with the insecticide will be maximized. Grass areas that receive pressure from adult mole crickets should be treated at peak egg hatch to ensure optimum control of subsequent nymph populations (see below).
Mole Cricket nymphs: Grass areas that received intense adult mole cricket pressure in the spring should be treated immediately prior to peak egg hatch. Optimal control is achieved at this time because young nymphs are more susceptible to insecticides and they are located near the soil surface where the insecticide is most concentrated. Control of larger, more damaging, nymphs later in the
year may require both higher application rates and more frequent applications to maintain acceptable control. Applications should be made as late in the day as possible and should be watered in with up to 0.25 inches of water immediately after treatment. If the soil is not moist, then it is important to irrigate before application to bring the mole crickets closer to the soil surface where contact with the insecticide will be maximized.
Talstar is our most popular selling product for mosquito control. It is a liquid concentrate that you mix with water and apply using any hand pump sprayer or backpack sprayer. The key is to apply it to all shrubs, trees, and other foliage around the house or patio you are trying to provide relief at. It should be directed not only on top of the leaves and plants, but on the underside of the leaves as well which is where the mosquitoes hang out. It should be applied every 30 days for optimum control. It is also very good for bees and wasps, however you would not want to apply it or any other product directly to play sets where children will touch treated surfaces. Also, Talstar is labeled for over 100 different insects and will work in just about any situation.