Which type of formulation is designed primarily for immediate use without further mixing?

Liquid baits are specifically designed for immediate use without the need for further mixing, making them highly convenient for applicators. These formulations are ready-to-use as they are formulated to deliver a precise dosage and are often used for targeted pest control. This characteristic is particularly beneficial in situations where time is of the essence or when ease of application is a priority.

In contrast, other types of formulations, such as concentrate solutions, emulsifiable concentrates, and ultra low volume formulations, typically require mixing with water or another carrier before application. Concentrate solutions often need to be diluted, emulsifiable concentrates require mixing with water to create a stable emulsion, and ultra low volume formulations may need specific application equipment to ensure an even dispersion. Thus, these options do not meet the criterion of being ready for immediate use without additional preparation.