We already have lost one of our potted rosemary bushes and now the same critters have struck our second and last one. Whatever it is leaves a fine web and tiny black nodules. The infected part withers away.
I control them by using a hard stream of water from a hose and blasting them off the plant. I have one rosemary in my garden, and I have been doing this for the last five years. It doesn't get rid of them completely, but it does keep them under control. This rosemary started out as a 1 foot tall plant in a 1 gallon pot, it is now 4 feet tall, 7 feet from front to back and 9 feet from side to side.
So check your gardening books for listings on red spider mites.
BigDave
PS No chemical fertilizers or pesticides used here.
HomeOwnersHub website is not affiliated with any of the manufacturers or service providers discussed here.
All logos and trade names are the property of their respective owners.