Which of the following is NOT a disadvantage of emulsifiable concentrate pesticides?

The option indicating that emulsifiable concentrate pesticides require constant agitation is not considered a disadvantage because this is a typical requirement for many types of pesticide formulations. Emulsifiable concentrates are designed to mix well in water but can separate over time. Constant agitation ensures that the pesticide remains uniformly distributed in the solution, allowing for consistent application and efficacy.

The other options highlight genuine disadvantages of emulsifiable concentrates. Higher phytotoxicity hazard refers to their potential to harm plants if misapplied. The fact that they can be easily absorbed through the skin raises safety concerns for handlers, making them more hazardous to human health. Additionally, flammability can pose risks during storage and application, especially in warmer climates or near heat sources. Therefore, while constant agitation is a normal operational practice, the other listed options denote true disadvantages associated with emulsifiable concentrate pesticides.