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Silverleaf Whitefly Control in Cotton with Knack™ Insect Growth Regulator

M.J. Ansolabehere, J.P. Chernicky


KNACK (pyriproxyfen) is an insect growth regulator (IGR) which is being developed in the United States for control of silverleaf whitefly, Bemisia argentifolii, (SLWF) in cotton. KNACK acts as a juvenile hormone mimic and causes inhibition of metamorphosis, embryogenesis, reproduction, and larval development in certain insects. In SLWF, KNACK inhibits egg hatch, either through the females or by direct contact with the egg, and suppresses adult emergence when larvae stages are affected. KNACK also exhibits pronounced translaminar movement in cotton leaves which also leads to inhibition of egg hatch and suppressed adult emergence after SLWF feeding on the lower leaf surface.

Reprinted from Proceedings of the 1996 Beltwide Cotton Conferences pp. 819 - 820
©National Cotton Council, Memphis TN

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Document last modified Sunday, Dec 6 1998