What is NOT a method to increase the selectivity of pesticides?

Increasing temperature is not a method used to enhance the selectivity of pesticides. Selectivity refers to the ability of a pesticide to target specific pests while minimizing effects on non-target organisms.

Application timing, for instance, can significantly affect selectivity, as applying a pesticide at the right moment can target pests when they are most vulnerable without harming beneficial species. The application method also plays an important role; techniques such as spot treatment or using targeted delivery systems can minimize exposure to non-target organisms. The choice of formulation is crucial too, as different formulations can have varying impacts on the behavior of the pesticide and its interaction with both the target and non-target species.

In contrast, while temperature might influence the efficacy of a pesticide (as in its rate of evaporation or chemical breakdown), it does not inherently alter the selectivity of the pesticide in the way that timing, method, or formulation can.