The alteration of juvenile hormone titre inSpodoptera litura (F.) due to a baculovirus infection |
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Authors: | B Subrahmanyam N Ramakrishnan |
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Institution: | (1) Division of Entomology, Indian Agricultural Research Institute, 110012 New Delhi, (India) |
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Abstract: | Summary The haemolymph juvenile hormone levels ofSpodoptera litura were remarkably low (540 Galleria units (GU)/ml) at the last larval moult as well as prior to pupation (194 GU/ml). During the last intermoult period this was 2600 GU/ml for a 24 h-period. On the other hand, the JH level in the haemolymph of NPV-infected last instar larvae was initially 1740 GU/ml but was maintained at 2400–2600 GU/ml during the next 48 h. Finally, the JH titre fell to 1393 GU/ml, but only prior to death. The failure of the diseased larvae to undergo the larval pupal moult is ascribed to the alteration of the JH titre in the haemolymph. |
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