A good way to find a pesticide according to the active ingredient, is to go to your favorite agriculture supply store, and ask the seller for the pesticide, containing this active ingredient.
If the seller doesn’t know, you can show him the pest and ask him to show you all the pesticides used against it, and look for the active ingredient between them.
you can also go through the pesticides labels and look for it by yourself.
Pesticides are divided into three groups:
Herbicides against weeds,
Insecticides, against insects
and Fungicides, against fungus.
This segmentation should be in every supply store, so it will be easier for you to find the active ingredient.
There are many pesticides that are working against each pest.
Some are better than others.
There are newer and older.
Many of them are not so lethal anymore because they were used many times and the pests developed tolerance against them.
The list of pesticides, I provide on this site is the best known today, and the list is being updated. Some of the pesticides, are lethal, for more than one kind of pest.