What requirement must be fulfilled when providing pesticide application recommendations?

The correct requirement when providing pesticide application recommendations is the identification of weeds. Accurate identification is crucial because it directly influences the choice of herbicides used and the effectiveness of the treatment. Different weeds may require different strategies and products to ensure successful control or eradication. Without proper identification, the recommendations could be ineffective or even harmful to the environment or non-target species.

While calibration of equipment, documentation of application history, and evaluation of pesticide effectiveness are all important aspects of pesticide application, they relate to the application process rather than the initial recommendation stage. Calibration ensures that the pesticide is applied in the correct amounts, documentation tracks usage, and evaluating effectiveness assesses the outcome after application. However, none of these can occur usefully without first correctly identifying the weeds in question, which guides the selection of an appropriate pesticide.