Yes, ImidaPro 2SC needs to be shaken well before using it.
Yes, ImidaPro 2SC can be used for a preventative treatment of grubs, prior to egg hatch in the spring.
Yes, as long as you do not exceed the yearly maximum application rates for ImidaPro 2SC, then you can divide that into multiple applications.
According to the product label, when using ImidaPro 2SC to treat for termites in a tree: Termite carton nests in trees may be injected with a 0.05 to 0.1% solution or sufficient volume of foam using a pointed injection fool. Multiple injection points to varying depths may be necessary. Removal of carton material from trees is desirable but may not be necessary when foam application is used. In some instances, a perimeter application of a 0.05% to 0.1% solution applied to soil around the root flare of the tree may be necessary to prevent reinfestation by termites in the soil. For small trees (< 6>