@Archaic 
Just saying myself, prefer Neem Oil / Cake / Powder over Dunks ..... and here’s why:
Neem an organic solution that not only exterminates pests but benefits the plant and PREVENTS those devils and a host of other pests ......Neem is used both in soil mixes, sprays and compost to feed the worms along with valuable supplements like Karanja, barley, kelp, alfalfa and other good stuff .....
Here is just one reference but I can fill page as to why - Seriuosly just check out what Wikipedia says about Neem as an Insect Killer and be sure to read where it benefits guess who,
WORLD’S BES T
GARDENER - The Earthworm .... Since I subscribe to growing in Living Soil I am Flippin all over Neem ....
Wikipedia Reference:
“Formulations made of neem oil also find wide usage as a biopesticide for organic farming, as it repels a wide variety of pests including the mealy bug, beet armyworm, aphids, the cabbage worm, thrips, whiteflies, mites, fungus gnats, beetles, moth larvae, mushroom flies, leafminers, caterpillars, locust, nematodes and the Japanese beetle.[3][4] Neem oil is not known to be harmful to mammals, birds, earthworms or some beneficial insects such as butterflies, honeybees and ladybirds (ladybugs in US English) if it is not concentrated directly into their area of habitat or on their food source. It can be used as a household pesticide for ant, bedbug, cockroach, housefly, sand fly, snail, termite and mosquitoes both as repellent and larvicide.[2] Neem oil also controls black spot, powdery mildew, anthracnose and rust fungi.”
Peace
