Talstar P is labeled to safely be used on trees, bushes and other ornamental plants. Talstar is not labeled to be used on vegetables or any type of edibles, so you should discard any edible vegetation that has come in contact with this product.
Talstar P 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 P is labeled for over 100 different insects and will work in just about any situation.
Talstar P and Demon WP are both synthetic pyrethroid products and work in a very similar way. The key difference here would be that the Demon Wp is a wettable powder and as such, it is able to stay on the surface of porous areas allowing insects to come in contact with it a bit better. That being said Demon WP also leaves a white powdery residue that is visible on dark surfaces. Talstar P is a concentrated liquid that is odorless, dries clear and is labeled for a huge variety of insects (including roaches) and areas making it a bit more versatile.
Talstar P will last up to 30 days outside. You do want to apply about 24 hours before you are expecting any rain. After that point, rain will not affect it.
Talstar P could potentially harm earthworms and other benficials should they come in contact with it; however, a surface application would not get deep enough into the soil for this to be an issue. Keep in mind, also, that earthworms have a coating that protects them from exposure to many products that would easily kill insects.