Abstract
The predaceous bug,Macrolophus caliginosus Wagner (Heteroptera: Miridae) is a biological control agent used in greenhouses in the French Mediterranean region. The egg of this mirid is embedded in plant tissues and all embryonic development occurs in this environment. In order to define an artificial substrate for egg-laying, exchanges of chemical substances between the egg and the host plant were investigated by morphological and biochemical analyses. Egg wet weight doubled throughout embryonic development, while egg dry weight did not vary. The amino acid content of the egg remained stable during embryogenesis. Only aspartic acid, serine and alanine decreased during the first five days of development. It can be concluded that exchanges mainly involved uptake of water by the egg.
Published Version
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