Abstract
Aphis spiraecola (Patch) was reared on the dropwort, Oenathe javanica DC, for artificial production of sexual forms, for 3 generations under low temperature (12–18°C) and short day (12L : 12D to 10L : 14D) conditions. Sexual males were produced in the second generation and sexual females (oviparae) in the third generation. The percentage of males induced was 21%, at most, among the total progeny produced. The sequence of sexual forms and gynoparae production showed a similar pattern as in the cases of other host-alternating, holocyclic aphids. Slender males were observed to mate with oviparae with distinctly swollen hind tibiae, which were raised together with the abdomen and waved from time to time, as an obvious behavior of releasing sex pheromone.
Published Version
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