All depends of course on composition including the pesticides. It seems that these have only a limited solubility in the oil phase and the surfactant is the main 'solubilizer'. If you use an oil phase with exceptional solvency microemulsion should behave differently on dilution with water.
yes, this should be the case. You will have more, slowly forming nuclei for crystallization, which will grow slower.
We have observed that crystallisation can be avoided by allowing better solubilisation conditions: more time and temperature allow guarantying the complete solubilisation (avoiding nuclei as mention by Titus).
When this solubilisation is complete the surfactant and water can be added and no crystallisation is observed on accelerated storage test & 2 years shelf live.
This is mostly true when trying more eco-friendly solvent having lower solvency and often higher water solubility (an excess of solvent will be required to compensate this water solubility)
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