Which formulations are less likely to cause wear on pumps and nozzles?

The chosen option is considered correct because emulsifiable concentrates and soluble powders are designed in a way that minimizes formulation wear on equipment such as pumps and nozzles. Emulsifiable concentrates typically produce stable emulsions when mixed with water, which helps create a uniform spray mixture that does not easily clog nozzles. This allows for efficient application without causing excessive friction or degradation of equipment.

Soluble powders can dissolve completely in water, leading to a smooth application with less physical wear on pumps and nozzles. The solid particles that would be present in some other formulations are either not present or are minimized in size, which contributes to smoother operation and less wear over time.

In contrast, other formulations like granules, dusts, and those containing larger or more abrasive particles can lead to more wear due to their physical properties. Similarly, baits and repellents can also contain ingredients that are harsher on equipment. Hence, emulsifiable concentrates and soluble powders are the preferred choice for maintaining the longevity of application equipment.