Neem oil is a highly effective and 100% natural pesticide, extracted from the seeds of the Neem tree in India. Neem oil is non-toxic to animals or people. Neem is systemic. It is most effective when used as a preventive, meaning that you spray every crop regardless of whether or not you see a pest. Organic Neem sprays can protect garden plants from chewing insects and fungal diseases and protect people and animals from biting bugs.
How to use?
Mix table spoonful of detergent/soap powder (This is because Many growers seem to be put off by its oiliness, finding sprayers clogged and plants left coated in oil. The solution is to get the oil broken down and suspended in the water, then we can get it onto the plants) in a litre water and then mix 20 to 50ml Neem oil.
Spray to drench the plants thoroughly (Note: Make sure spray propagates to both upper and lower surfaces of the leaves).
This neem oil is already mixed with a declogging agent, to avoid clotting at the nozzle while spraying. Due to the mixture, it would appear dark in colour.
For good effect, pests should come in contact with Neem Oil(This is important because Neem oil doesn’t directly kill bugs, it stops them from reproducing, feeding and molting their skins. So in effect, it breaks their life cycle.)
On a suggested note you need to spray for at least the length of one life cycle, which for bugs in ideal conditions (like most growrooms) is around 2 weeks, sometimes a little longer.