Hi, 5101 here...
Last year, I applied some neem oil, straight from a bottle (this dark oil is from India) and there is no "how to use" in English, but in Tamil/Hindustani. I dabbed affected leaves with a cotton bud dipped with the oil. The thrips or whatever tiny crawlies died but so did the leaves - later fall off. Major disaster. hence I am not sure how to dilute the oil and maybe those sold i the US etc are of better quality. So, maybe I might try garlic, neem leaves, lantana leaves (all blended) and see how it goes.