All of my rosemary plants are infected with rosemary mites, which are some kind of variety of spider mite. These invisibly tiny insects cause unsightly yellow mottling on the leaves of the rosemary, and (more importantly to me) are detrimental to the flavor of the rosemary. Oddly, though, they don't prevent the rosemary from continuing to grow.
Since I use this rosemary for culinary purposes, I do not want to use any toxic pesticides, or anything which is hard to wash off (like pepper wax or cinnamon oil). There are three solutions I've seen recommended for this and I wanted to ask if anyone had tried them and what your results were:
- Neem Oil
- Rosemary Oil
The second solution seems ideal. However, I've had trouble locating rosemary oil in pesticide quantities; everywhere I've seen it has been in the neighborhood of 4oz for $14, which won't work for the applications I need to do. My second issue with applying oils is that it's hard for me to get good coverage on a 4' tall, 4' diameter rosemary bush.
So, here's the answers I'm looking for:
- the best method you've tested for removing spider mites from rosemary
- advice on finding rosemary oil in pesticide quantities (e.g. 32oz) and prices
- advice on oil application for a large rosemary plant