This is the 12209th most frequent Russian word.
инсектицидом
In English, "инсектицидом" means "insecticide" (a substance used to kill insects).
In this sentence, 'инсектицидом' is used in the instrumental case to indicate the means by which the action (treating the plants) is accomplished.
Я обработал свои растения инсектицидом для защиты от вредителей.
I treated my plants with an insecticide for pest protection.
Here, 'инсектицидом' refers to the type of substance chosen for pest control, emphasizing its natural origin in comparison to others.
Многие фермеры предпочитают натуральный инсектицидом вместо химических средств.
Many farmers prefer using a natural insecticide instead of chemical agents.
This usage of 'инсектицидом' suggests the criteria or approach related to selecting an insecticide, implying responsibility and awareness of environmental safety.