Use as a foliar spray at dusk and/or dawn to ensure you are not causing any harm to beneficial pollinator insects. Avoid applying in the middle of the day to not burn the sprayed foliage. Can use on the seedlings once they have 3 pairs of true leaves.

Neem Pest Control already contains an emulsifier. If you want additional emulsification add an agent like dish detergent or preferably soapnut liquid or castile liquid soap. Add up to 1 teaspoons of emulsifier to 1 tablespoon of  Organic Bio Pesticide. Mix thoroughly. Add 4 liters of water and shake to obtain a homogeneous mix. You can add a few drops of peppermint essential oil  because many bugs are repelled by the fragrance, as well. Use as a foliar spray or pour over the soil around your plants every 7-14 days as prevention measure or every 5-7 days to control present infestation. Make small batches and use within a day. Use on all parts of the plant.

Cold pressed neem oil with natural pesticide components Azadirachtin, Salannin, Meliantriol, Nimbin and Nibidin. Azadirachtin interferes with growth and reproduction (infertility) of pests and reduces appetite. 

Neem oil also has an inhibitory effect on the metamorphosis phase of pests. Nimbin and Nimbidin stop the activity of viruses found in plants and those carried by insects.