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Phagostimulant Activity of Sucrose, Sterols and Soybean Leaf Extract Ables to the Cabbage Looper Trichoplusia Ni (Lepidoptera: Noctuidae)

Published online by Cambridge University Press:  19 September 2011

H. C. Sharma
H. C. Sharma
Affiliation:
Department of Entomology, 237 Russel Labs, 1630, Linden Drive University of Wisconsin, Madison, WI 53706, USA
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Abstract

Phagostimulant activities of sucrose, sitosterol, stigmasterol, campesterol, and soybean leaf extractables were evaluated towards the third-instar larvae of the cabbage looper, Trichoplusia ni Hubner (Lepidoptera: Noctuidae) on elderberry-pith discs under laboratory conditions. There was a linear relationship between sucrose dosage and larval feeding on the pith discs. Water fraction from PI 227687 soybean leaf extractables at dosages > 400 μg/disc inhibited feeding by T. ni larvae. Ethyl acetate fraction showed phagostimulant properties comparable to sucrose. Sterols (5 μg/disc) and soybean leaf extractables (40 μg/disc) in combination with sucrose (400 μg/disc) showed synergistic effect as phagostimulants. Implications of genotypic differences in sterol content in relation to host plant resistance are discussed.

Résumé

Les activités appétitrices du sucrose, du sitostérol, du stigmastérol, du campestérol et d'extraits de feuille du soja ont été évaluées au laboratoire contre le 3éme stade larvaire de l'arpenteuse du chou, Trichoplusia ni Hubner (Lepidoptera: Noctuidae) sur des disques en moëlle de baie de sureau. Une relation linéaire s'est dégagée entre concentration du sucrose et consommation par la larve des disques de moëlle. La fraction aqueuse de l'extrait de feuille du soja “PI 227687” aux concentrations supérieures à 400 μg/disque a inhibé la consommation chez Trichoplusia ni. La fraction avec l'éthyl acétate a montré des propriétés appétitrices comparables au sucrose. Les stérols (5 μg/disque) et les extraits de feuille de soja (400 μg/disque), associés au sucrose (40 μg/disque) ont produit un effet synergétique en tant qu'appétents. Les implications des différences génotypiques dans le contenu en stérol en rapport avec la résistance à la plante-hôte sont discutées.

Keywords

Sucrosesitosterolstigmasterolcampesterolphagostimulantshost plant resistancesoybean extractablesSucrosesitostérolstigmastérolcampestérolextraits de feuille du sojaagents appétentsrésistance à la plant-hôte
Type
Research Articles
Information
International Journal of Tropical Insect Science , Volume 15 , Issue 3 , June 1994 , pp. 281 - 286
Copyright
Copyright © ICIPE 1994

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