At what stage should the higher application rate of Vectobal 12 be used for larvae?

Using a higher application rate of Vectobal 12 is most effective during the late third instar stage of larvae. At this stage, the larvae are larger and more developed, making them more susceptible to the active ingredients in Vectobal 12. The late third instar is critical because larvae are preparing to pupate and are voracious feeders, meaning they will consume more of the product effectively, leading to better control and higher efficacy in reducing the population.

Applying the product during this phase ensures that the larvae take in a sufficient dose to disrupt their development and control their numbers effectively. Employing a higher rate at earlier instars might not yield the same results, as small, newly hatched larvae may not consume enough of the product to effectively manage the population compared to later instars that are actively feeding. Hence, targeting the late third instar maximizes the intended impact of the treatment.