ULV methods of applications are characterized by which of the following?

ULV (Ultra-Low Volume) methods of application are characterized by using lower than normal application rates. This technique is designed to maximize the effectiveness of the pesticide while minimizing the quantity needed. The primary goal is to disperse a very fine mist of pesticide particles, which allows for thorough coverage and penetration of the target area without the use of larger volumes of liquid.

This method is particularly advantageous in situations where traditional high-volume applications might be impractical or could lead to excessive runoff, drift, or damage to non-target organisms. By employing lower volumes, ULV applications are not only more efficient but also help reduce the overall amount of chemicals being introduced into the environment, which is an important consideration for maintaining ecological balance.

The other options present characteristics that do not align with the principles of ULV applications. For example, higher than normal concentrations and potential for causing injury to sensitive vegetation do not effectively reflect the standard practices associated with ULV methods, which aim for safety and efficiency. The flushing action for cockroaches is related to different methods of pest control and does not specifically pertain to the ULV technique.