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Manipulating the Photoperiod to damage Insects (1969)

SULLIVAN, W. N. ; CAWLEY, B. M. ; OLIVER, MARIA ; [et al.]

[s.l.] : Nature Publishing Group

Nature 221 (1969), S. 60-61

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ISSN: 1476-4687

Source: Nature Archives 1869 - 2009

Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics

Notes: [Auszug] Pittendrigh3, Adkisson4, Minis5 and Lees6 manipulated photoperiods in studies of response curves of eclosion (Drosophila pseudoobscura) and diapause and egg laying (Pectinophora gossypidla (Saunders) and Megoura). The insects were subjected to 8?12 h of light (L) and 12?16 h of dark (D) with a ...

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1038/221060a0

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The observed sex ratio ofPediobius foveolatus [Hym.: Eulophidae] in field populations ofEpilachna varivestis [Col.: Coccinellidae] (1977)

Stevens, L. M. ; McGuire, J. U. ; Steinhauer, A. L. ; [et al.]

Springer

BioControl 22 (1977), S. 175-177

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ISSN: 1573-8248

Source: Springer Online Journal Archives 1860-2000

Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition

Description / Table of Contents: Résumé Des larves deEpilachna varivestis Mulsant, parasitées parPediobius foveolatus (Crawford) ont été récoltées en 1975 dans des champs de soja du Maryland. Les adultes deP. foveolatus issus de ces larves ont été dénombrés et les sexes reconnus. Le nombre de mâles par rapport aux femelles augmente lorsque la disponibilité de la nourriture offerte par l'hôte diminue. Ces renseignements sont utiles pour l'établissement de modéles exponentiels destinés à prévoir les interactions hôtes/parasites.

Notes: Abstract Larvae ofEpilachna varivestis Mulsant, parasitized byPediobius foveolatus (Crawford), were collected in soybean fields in Maryland during 1975. AdultP. foveolatus emerging from the larvae were sexed and counted. The ratio of males to females increased as the availability of food within the host decreased. This information is useful in development of exponential models predicting hostparasite interactions.