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Identificazione rapida degli stadi giovanili di Acyrthosiphon pisum (Harris) (Homoptera Aphidoidea)

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A key for larval instars discrimination of the pea aphid, Acyrthosiphon pisum (Harris) is here presented. The key is based on characters that are easily detectable in living aphids, feeding on their usual substratum. First and second instar have 5-segmented antennae, but the second instar shows a dark band at the 3rd antennal segment.
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