Unlocking the Power of Azadirachtin: The Top Brands Revolutionizing Horticulture

Azadirachtin is a complex chemical compound found in the seeds of the neem tree (Azadirachta indica),
classified as a limonoid. It is a highly oxidized tetranortriterpenoid, known for its numerous oxygen-
containing functional groups, including enol ethers, acetals, hemiacetals, a tetra-substituted epoxide,
and various carboxylic esters.

THE CHEMICAL COMPOSITE OF AZADIRACHTIN

The structure of azadirachtin is intricate, featuring both secondary and tertiary hydroxyl groups, as well
as a tetrahydrofuran ether. With 16 stereogenic centers, including seven tetrasubstituted ones, this
complexity makes synthesizing azadirachtin from simple precursors in the lab extremely challenging.
It is for this reason that it is important to know from where you are purchasing azadirachtin and how it is
being processed. Not all manufacturers are the same quality, have the same shelf life, nor do they all
boast the same efficacy.

It wasn’t until 2007 that the first total synthesis of azadirachtin was achieved, more than two decades
after its discovery. Since then, farms have been using it to control a variety of pests including thrips,
mites, aphids, flies, and more.

GENERAL INFORMATION ON AZADIRACHTIN

Azadirachtin was first recognized for its ability to inhibit feeding and disrupting growth. Azadirachtin is
considered an effective insecticide due to its biodegradability (it breaks down in light and water within
100 hours) and low toxicity to mammals, with an LD50 of more than 3,540 mg/kg in rats, making it
practically non-toxic to them.

This compound is primarily found in the seeds of the neem tree, where it makes up 0.2% to 0.8% by
weight. Neem also contains other related compounds with similar pest-control properties, found in its
leaves and bark. These compounds generally have minimal effects on beneficial arthropods, and neem
extracts have been found to work well in biological control programs. When used as a pesticide, neem
oil— which contains azadirachtin along with other insecticidal and fungicidal compounds—is typically
mixed with water at a rate of 1 US fluid ounce per US gallon (7.8 mL/L).

Azadirachtin is the key ingredient in several commercial pesticides, including TreeAzin, BioNEEM,
AzaGuard, AzaSol, DeBug Turbo, EcoWorks, Molt-X, Terramera Proof, and Terramera Cirkil. It also has a
synergistic effect when combined with the biocontrol agent Beauveria. Nimbecidine, a natural
insecticide, is a mix of azadirachtin and other limonoids.

MODE OF ACTION

Azadirachtin exerts its effects on insects through multiple pathways. It functions as an insect growth
regulator, disrupting the activity of ecdysteroid (especially 20-hydroxyecdysone) and juvenile hormones.
By reducing the secretion of prothoracicotropic hormone (PTTH) and allatotropins from the corpus
cardiacum, it inhibits pupation and disrupts neuroendocrine functions, including the degeneration of
other glands.

The compound also interferes with reproduction, potentially causing sterility by impacting hormone
signaling and yolk protein synthesis. It further reduces mating success by deterring insects from mating.

As an antifeedant, azadirachtin alters the insects’ sense of smell, often causing them to avoid food
treated with it. If they do ingest it, the compound inhibits digestive enzymes and may create a negative
taste memory by activating dopaminergic neurons.

Additionally, azadirachtin targets a wide range of cellular and molecular processes, including the
upregulation of p53, disruption of protein synthesis (possibly through binding to Hsp60), and
modulation of various signaling pathways.

The biosynthesis of azadirachtin involves a complex pathway, with the steroid tirucallol believed to be
the precursor for neem's triterpenoid secondary metabolites. Tirucallol is formed from two units of
farnesyl diphosphate (FPP), creating a C30 triterpene, which loses three methyl groups to become a C27
steroid. This is then converted to butyrospermol, which undergoes oxidation and rearrangement to form
apotirucallol.

Through further oxidation and structural rearrangements, including the cleaving of terminal carbons and
the cyclization to form a furan ring, the compound undergoes transformations into azadirone and
azadiradione. These intermediates are further oxidized and cyclized, ultimately forming the C-seco-
limonoids, such as nimbin, nimbidinin, and salannin. Finally, salannin undergoes heavy oxidation and
cyclization to yield azadirachtin, completing the biosynthetic pathway.

THE DOWNSIDE OF USING AZADIRACHTIN

Azadiractin sounds great and in fact it is a wonderful option. That said, it’s important to understand the
downside of its usage as well.
- Cost – Azadiractin is relatively expensive when compared to other competing options
- Oil – Olis suffocate which means they smother the bug but they do so to the crop as well
- Duration – Azadiractin degrades relatively quickly and loses its efficacy
- Processing – Not all brands manufacture to the same quality so know what you’re buying
- Azadiractin vs Neem – Azadiractin isolates just one compound found in neem oil

Check out one of our popular Azadirachtin products; BioSafe AzaGuard Azadirechtin Insecticide 3%