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Induction of prolonged larval feeding stage by juvenile hormone analogues inTribolium Castaneum

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Abstract

Dietary ZR-512 and ZR-619 at concentrations of 10 — 1000 ppm induced prolongation of the larval feeding period up to tenfold, increasing larval weight up to double that of untreated larvae.

A comparison study of four juvenoids, using 200 ppm of ZR-512, ZR-515, ZR-619 or ZR-777, showed that ZR-515 elicits the highest larval weight (6.2 mg) and ZR-777 the lowest (3.6 mg). In all cases a pronounced enhancement of larval weight — of 50 — 250% relative to untreated larvae (2.4 mg) — was obtained.Tr. castaneum larvae reared up to their 3rd instars on a diet containing 100 ppm of ZR-512, ZR-515, ZR-619 or ZR-777 and then transferred to a juvenile hormone-free diet, were not affected. The period between 4th instar larva and pupation should therefore be considered as critical for juvenile hormone effect.

The induced prolongation of the larval stage after juvenile hormone treatment was followed by a pronounced enhancement of cuticle phenoloxidase activity, indicating an alteration of the larval biochemical processes.

Although juvenile hormone treatment inhibitsTr. castaneum pupation and emergence, it markedly prolongs larval feeding stage and weight and thus accelerates damage.

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Authors and Affiliations

  1. Div. of Entomology, ARO, The Volcani Center, Bet Dagan

    Sara Yablonski

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  1. I. Ishaaya
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  2. Sara Yablonski
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Ishaaya, I., Yablonski, S. Induction of prolonged larval feeding stage by juvenile hormone analogues inTribolium Castaneum . Phytoparasitica 4, 9–18 (1976). https://doi.org/10.1007/BF02981074

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