Moderate infestations may occur following a cool summer or within a closed orchard canopy. In trees with open canopies, the scale population should decrease or remain stable, depending on summer temperatures. After a mild summer, a dormant oil should be applied. Heavy infestations are rare in open canopies, but orchards with closed canopies must be pruned, chemically treated, or both. Severe infestations occur in closed-canopy orchards in which treatment of moderate or heavy scale infestations is delayed.
Economic loss can be extensive.
Effective against light to moderate infestations, especially when used in conjunction with pruning to open the orchard canopy. Do not apply any oil between August 20 and harvest to olives used for Spanish or green-ripe processing due to fruit spotting. Most effective when applied against the crawler stage. Do not apply any oil between August 20 and harvest to olives used for Spanish or green-ripe processing due to fruit spotting. This material is very destructive to most natural enemies.