Neem oil and neem cake are effective against a wide variety of pests due to their natural insecticidal properties, primarily because of the compound azadirachtin. Here’s an extensive list of pests that can be managed using neem oil and neem cake:

Neem Oil:

1. Aphids - Small, soft-bodied insects that suck sap from plants.
2. Whiteflies - Tiny, white, moth-like insects that feed on the undersides of leaves.
3. Spider Mites - Tiny arachnids that create webbing and feed on plant cells.
4. Mealybugs - White, cottony insects that suck sap from plants.
5. Scale Insects - Small, immobile pests that attach to stems and leaves, sucking plant juices.
6. Thrips - Small, slender insects that feed on plant sap, causing discolored or distorted leaves.
7. Leafhoppers - Insects that jump from leaf to leaf, feeding on sap and spreading disease.
8. Caterpillars - Larvae of butterflies and moths that chew on leaves and stems.
9. Japanese Beetles - Beetles that feed on the leaves, flowers, and fruits of plants.
10. Fungus Gnats - Small flies whose larvae feed on organic matter in the soil, sometimes damaging roots.
11. Leaf Miners - Insects that burrow between the layers of leaves, creating tunnels.
12. Sawflies - Larvae that feed on leaves, often skeletonizing them.
13. Hornworms - Large caterpillars that feed on tomato and pepper plants.
14. Stink Bugs - Shield-shaped bugs that feed on fruits, vegetables, and ornamental plants.
15. Chinch Bugs - Tiny insects that feed on grass, causing it to turn brown.
16. Root-Knot Nematodes - Microscopic worms that cause galls on roots, leading to stunted growth.
17. Armyworms - Caterpillars that feed on grasses and cereals, causing significant damage.
18. Cabbage Worms - Caterpillars that feed on cabbage and related plants.
19. Corn Earworms - Caterpillars that damage corn and other crops by feeding on the ears.
20. Mosquito Larvae - Larvae of mosquitoes that develop in standing water.

Neem Cake:

1. Soil-Borne Pests - Including root-knot nematodes, grubs, and weevils that damage plant roots.
2. Termites - Wood-destroying insects that can also damage roots in the soil.
3. Fungal Gnats - Larvae that live in soil and feed on organic matter, affecting plant roots.
4. Cutworms - Caterpillars that live in the soil and cut down seedlings at the base.
5. Wireworms - Beetle larvae that live in the soil and feed on plant roots.
6. Root Maggots - Fly larvae that live in the soil and feed on plant roots.
7. Soil Grubs - Beetle larvae that feed on plant roots, causing stunted growth.

And many more.