Life Cycle: Citrus thrips, Scirtothrips citri, starts its life cycle as an egg that is inserted in leaf tissue. The egg hatches into a 1st instar nymph that matures into a 2nd instar nymph. The nymph stages do the damage to fruit because they hide under the sepal of the fruit and insert their mouthparts in the top of the fruit causing a ring scar. The next stages are quiescent and nondamaging; the prepupa and pupae which occur on twigs and soil. The adult males and females tend not to damage fruit. There are 8 generations per year attacking foliage and fruit, however, the only damaging generations are those that occur when the fruit is less than 2.5 cm in diameter. The entire lifecycle requires about 4 weeks to complete.
Host List: Citrus thrips feeds on citrus, but sumac was its original host and it is now attacking blueberries.
Damage: Leaf damage is tolerated by citrus trees. Citrus fruit can be damaged from just after petal fall until it reaches 2.5 cm in size.
Distribution: Found throughout California citrus.