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Titre :
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Feeding activity of Sitona lineatus L. (Col., Curculionidae) on Pisum sativum L. (Leguminosae) during its imaginal life
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Auteurs :
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F. Landon ;
J. Levieux ;
J. Huignard ;
D. Rougon ;
P. Taupin
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Type de document :
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article/chapitre/communication
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Année de publication :
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1995
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Format :
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515-522
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Langues:
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= Anglais
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Mots-clés:
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Alimentation
;
Adulte
;
Nutriment
;
Temperature
;
Qualite plante hote
;
Sitona lineatus
;
Curculionidae
;
Pisum sativum
;
Leguminosae
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Résumé :
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At emergence, Sitona lineatus L., the pea leaf weevil, was extremely polyphagous. It fed on various legumes without showing any specific preference for the pea. Sensitivity to the host plant became apparent in the reproductive period. The pea leaf weevil was then capable of distinguishing between leguminous as well as different varieties of peas, according to criteria that are still unknown. The fact that it fed on peas did not lead to recognition. The triggering of feeding was temperature dependent. The threshold of 12 degrees C led to intense feeding throughout the population. Climatic factors were not solely responsible for feeding; there seemed to exist a rhythm specific to each individual, probably related to the species' method of colonization. An individual's consumption was measured in the laboratory by two methods. First, by counting the characteristic notches made by the insect each time it fed, and second by measuring by image analysis the surface of the pea stipule consumed. The average daily consumption of an individual was approximately 1.1 notches, representing a leaf area of about 5.8 mm(2). The quantity consumed was independent of the quantity of food present and the phenological stage of the pea. The attack on the host plant was situated on the newer, more tender leaves. An individual's daily food intake corresponded to 0.4 cal. The high concentration of protein in the protein pea stipules (33.7% of the dry weight) would partly explain why populations in their reproductive period move from wild legumes to cultivated legumes such as the pea.
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Source :
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Journal of Applied Entomology - Zeitschrift Fur Angewandte Entomologie - 0931-2048, vol. 119, n° 8
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