Neem EC Formulations
Aza 0.03% EC as explained earlier is made from CPNKO and is good as repellant. This is good formulation for control of soft bodied insects like aphids, jassids, thrips, white flies etc. It also repells adult moths so that egg laying is deterred. 

Aza 0.15% EC and other higher concentrations are used as Insecticide because the larvae (caterpillars) get killed by anti feedant action.

Aza formulations are stable for a period of one year from the date of formulation and minimum Aza content will be as per the label claim. The manufacturers generally load some higher levels of Aza in the formulations so that the minimum claimed potency is maintained even at the end of shelf life.