Cori Ann, hello...I would just follow the instructions on the bottle..I think there is only a certain amount of times or a proper way of spraying that the recommend...

Yes ... but it is a little confusing because it looks like in different areas of California the timing is different. There's no specific recommendations for NorCal, but there are recommendations for central cal, SoCal and Oxnard.

Hopefully NorCal recommendations are like Oxnard because I already applied --- and it's ok in Oxnard, but not the right time in central or SoCal (weird).

Also... it doesn't say how often to reapply.

Also... when I checked with my local master gardeners they confirmed it was the right time to spray with horticultural oil in my area. I didn't ask how often to reapply tho.... which is why I am asking all of you. Thank you!

Cori Ann. I have never read the back of the bottle of mine, I just use as needed and have never had a problem..I just did not want to give you advice other than what the bottle might of said, but then I see it says.."Spray as needed"....I assume that as often as you would like in the the seasons they recommend.....

It' is nice to know it does not say only a certain amount of times...))

I hope the instructions at least tell you the best times of the day to apply it. I am assuming with the hot sun you have, very early in the morning or after the hottest part of the day..Well. I will be dam, they do!

Thanks so much Mike! LOL... yeah I'm the type that reads instructions. It's weird that there's only certain months recommended to apply to certain citrus in Central CA and Southern CA. I'm sure there is a reason... but I don't know what it might be. Plus I wouldn't really want to apply the oil during some of those months since it's so hot. It perplexes me.

And Oxnard can apply any time. I wonder why. ?

Still curious tho ... how often do you spray?

Also.. anyone from Cali out there? How often do you spray with horticultural oil?

Reapplication is recommended in 2-4 weeks for roses. That's what I planned to do with my citrus too just because it's easy to do it all at once (unless someone out there is adamant that I don't for some reason that I'm not currently aware of)... but I'm curious how often all of you spray with horticultural oil. Just curious how often everyone else does it.

I plan to just do maybe one or two more applications. After that it will probably be getting too warm (at least I think... but what do I know?) I am an obvious total nooooob (newbie) when it comes to horticultural oil.

Thank you so much!

Well... I wish others would have shared their experiences, but maybe the westerners are all just outdoors, staying busy.

I'm supposed to have at least a week of sunshine starting next week so I plan to just spray the oil again then since it's between the little rain storms we have been having.

If the weather permits, I may spray one more time after that in another 2 weeks or so.

By March it will probabaly be too warm so I plan to make my last application in February.

Then I will unleash some predator nematodes. :)

Will do. :)

I got some really good advice about applying horticultural oil in my area of CA from a local nursery and thought I would share it! They even have it published online to make it easy! http://www.aldenlane.com/dormant-winter

In this area, a January dormant spray application is considered optional if pests have not been a huge problem in the past (it's a good preventative measure). Most fruit trees and roses benefit from one or 2 sprayings to control insects (smothering overwintering eggs).

I will be doing my second application of horticultural oil this weekend, which is a little less than 2 weeks from my first application. 2-4 weeks apart is recommend. My schedule just works out best this way.

I also have a lot of roses. Horticultural oil is great for them too. There's a few extra tips for roses in my area though. Basically, the roses in our area don't go dormant, so we can help force them into dormancy in January by removing their leaves. January is the time to prune them, strip them of leaves, and spray them with the higher dormant season rate. The roses will thank you soon by pushing out new growth.

For all season oil, like the one I used, you can use the stronger dormant rate when spraying leafless, dormant roses. But use a lighter rate when roses are pushing out new leaves.

Hope this helps others looking for the same info. It's specific and local though.... in different areas it may be completely different advice!