Developmental changes in trans-permethrin and α-naphthyl acetate ester hydrolysis during the last larval instar of Pseudoplusia includens |
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| Authors: | Patrick F Dowd Thomas C Sparks |
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| Institution: | Department of Entomology, Louisiana Agricultural Experiment Station, Louisiana State University Agricultural Center, Baton Rouge, Louisiana 70803 USA |
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| Abstract: | The hydrolysis of trans-permethrin and α-naphthyl acatate by midgut, fat body, and cuticle homogenates from Pseudoplusia includens (Walker) was monitored during the development of the last instar. The midgut homogenates appeared to have two pH optima (7.6 and 8.6) for the hydrolysis of trans-permethrin, the fat body homogenates had one optimum (7.4–7.8), and the cuticle homogenates had a major optimum at 6.6. Hydrolysis of both substrates peaked during the late feeding stages for midgut and cuticle homogenates, although relative changes were not the same. Hydrolysis of trans-permethrin peaked during the late feeding stage in fat body homogenates, while hydrolysis of α-naphthyl acetate continually increased through the prepupal stage. Thus, the hydrolysis of α-naphthyl acetate is not necessarily associated with the hydrolysis of trans-permethrin. The LD50 values for trans-permethrin on the different stages appeared to reflect the influence of hydrolysis. |
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| Keywords: | To whom correspondence should be addressed: Department of Entomology 404 Life Sciences Bldg Louisiana State University Baton Rouge La 70803 |
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