You can spray plants with Bifen IT on days with high temps but you should refrain from spraying during the heat of the day. Instead, restrict applications to very early morning or late evening. This will prevent the sun rays from scorching the plants while they are still wet.
Bifen IT is not labeled to be used on anything edible so would not be recommended. For vegetable garends we would recommend using the Fertilome Triple Action. It is an insecticide, miticide and fungicide in one. For systemic treatment of aphids, you could also use the Fruit Tree & Vegetable Systemic Soil Drench.
Bifen IT is not labeled for lice. We do carry products that can be used for lice control. Please take a few moments to review our article on How to Get Rid of Head Lice for more helpful information.
Bifen has not proven harmful to Frogs or Snakes. It may deter the food they are preying on, but will not harm them.
We do not see any reason why you can't spray Bifen IT and Hi-Yield Atrazine together. For more information on application and dilution, please refer to the product labels of each product.