The iris thrips is primarily a pest of ms and is now known to be present in 10 States.

Foliage and leaf sheaths Of many types Of iris show a rusty or blackened injury, while on Japanese iris flower bracts and petals may be injured.

Insects of this species overwinter as adult females In the crown Of the host. Oviposition begins late _in April, and the first Offspring reach maturity late in May. Development Of generations continues until the latter part of October. Most adults are wingless, but macropterous females appeared with the first generation and were present during the summer and early part Of the fall. Migration apparently occurs chiefly in June when winged forms are most abundant.

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