Abstract
NEARLY all phytophagous Hemiptera, including aphids, secrete a salivary material which coagulates rapidly on ejection to form a ‘stylet-sheath’ enclosing the path of the stylets in food materials and even in agar gel1 and liquids2. It has been reported3 that some Heteroptera secrete in addition a separate watery and water-soluble saliva which is emitted and sucked back both on the surface of substrates and within them. However, opinions differ on whether jassids secrete one type of saliva from which water-soluble substances diffuse before it gels4 or two distinct types of saliva5; and among the Homoptera generally, only a sheath-forming secretion has hitherto been demonstrated conclusively.
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References
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MILES, P. Secretion of Two Types of Saliva by an Aphid. Nature 183, 756 (1959). https://doi.org/10.1038/183756b0
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DOI: https://doi.org/10.1038/183756b0
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