Abstract
Adults ofGeocoris punctipes (Say),Tropiconabis capsiformis Germar,Nabis roseipennis Reuter andColeomegilla maculata (DeGeer) were confined inside petri dishes and fed phosphorus-32 (32p)-labeledHeliothis virescens (F.) eggs. Observations of bioelimination of32p over a 72 h period allowed derivation of equations for predicting the number ofH. virescens eggs ingested by each species. Twenty-four to 72 h after eggs were eaten, the percentages of32p eliminated ranged from ca. 14% forG. punctipes to 42 % forT. capsiformis. Cautious use of the results will aid researchers in assessing predation on32p labeledHeliothis.
Résumé
Des adultes deGeocoris punctipes (Say),Tropiconabis capsiformis germar,Nabis roseipennis Reuter etColeomegilla maculata (DeGeer) ont été confinés à l'intérieur de boîtes de Pétri et nourris d'œufs d'Heliothis virescens marqués au P32. Les observations sur la bioélimination du P32 sur une période de 72 h permettraient l'établissement d'équations destinées à prévoir le nombre d'œufs d'H. virescens ingérés par chaque espèce.
Vingt quatre à 72 h après que les œufs aient été mangés les pourcentages de P32 éliminé s'échelonnaient de 14 % pourG. punctipes à 42 % pourT. capsiformis. L'emploi prudent de ces résultats aidera les scientifiques en évaluant la prédation sur lesHeliothis marqués au P32.
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Publication No 5935. Mississippi Agricultural and Forestry Experiment Station, Mississippi State, MS 39762.
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Thead, L.G., Pitre, H.N. & Kellogg, T.F. Phosphorus-32 bioelimination by arthropod predators fed labeled eggs ofHeliothis virescens [Lep.: Noctuidae] . Entomophaga 32, 191–195 (1987). https://doi.org/10.1007/BF02373130
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DOI: https://doi.org/10.1007/BF02373130
Key-Words
- Bioelimination
- Coleomegilla maculata
- Geocoris punctipes
- Heliothis virescens
- Nabis roseipennis
- Tropiconabis capsiformis
- Phosphorus-32
- Predation