According to the University of Georgia Strawberry blog, it is important for strawberry growers to scout their fields for possible spider mites, especially this early in the production season.
“Early detection is important since research has proven that even low numbers of mites can reduce yields,” according to Jeff Cook, University of Georgia Cooperative Extension Agriculture and Natural Resources agent for Peach and Taylor counties, in the blog. “At this time of the season, the threshold for strawberries is five per leaflet or 15 per leaf.”
Multiple miticides are available for producers. It’s important to note that some are only effective at different life stages. It is good to rotate products with differing modes of action if multiple applications are needed.
Thorough coverage is critical, since mites can feed on the underside of the leaf. Application rates of 50 and 100 gallons of water per acre are not uncommon for controlling mites.
The spider mites possess piercing-sucking mouthparts that damage the plant as they feed on the plant’s cells.
Low levels of infestation and feeding can cause a slight stippled look to the upper leaves. As infestations grow, the leaves become brittle with a bronze tint. Higher populations are evident with small, clear spherical eggs on the underside of the leaves.
Contact your County Agent if you need assistance or recommendations.
Strawberries can tolerate higher numbers as the season progresses. The threshold increases to 20 per leaflet as the year moves on.