No worries about spraying Avid during the day, just be sure it will not rain and wash it all off before it has time to dry. I used a surfactant with Avid, I don't think it is really necessary though because sprays stick to fig leaves very well. Dormant oils are recommended for eriophyid mites in general, as are "summer oils" at bud break. Sulphur seems to be the go-to spray for the fig industry, don't think any pesticides are specifically labeled for fig trees. But notice they are for "control" not eradication, it takes something that will absorb into the plant (like Avid) and kill them when they feed to get rid of them all. After all they can be found inside of buds and small figs where sprays cannot reach them.
B• Horticultural soaps and oils: Apply dormant weight horticultural oils 7-10 days before bud break and again at bud break. Proper timing targets eriophyid mites and preserves beneficial arthropods. During the summer soaps and summer weight oils offer mite control or suppression. Proper timing can also target other common plant pests such as aphids. Test for phytotoxicity before spraying the whole plant.
• Sulfur: Sulfur has long been used for mite control. Full coverage is necessary for control. Do not apply when temperatures exceed 90°F, or during periods of high humidity.
Best of luck, I do still see pictures of leaves on forums and eBay that look like they could have fig bud mites, and the general attitude or fig viruses as completely benign (mostly from sellers, the truth!) makes identifying the problem that much harder. Researchers often make no distinction between symptoms of the 2. There are plenty of misidentified images of fig bud mite damage as FMV, many from respected institutions that cause confusion. We are truly in a pickle, growers for the most part are all on their own dealing with the problem and it is not something that gets brought up very often.
Here is a picture from "An Illustrated Guide to Plant Abnormalities Caused by Eriophyid Mites in North America" of fig leaves with fig bud mite symptoms.
And a picture from http://www.dpi.nsw.gov.au/__data/assets/pdf_file/0017/119501/fig-growing-nsw.pdf of internal browning caused by fig bud mite feeding on fruits. I've seen some of this from time to time shown in pictures as well.
