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Effects of short term exposure to low temperature on wing development in the grain aphid Sitobion avenae (F.) (Hem., Aphididae)

The effects of brief exposures to sub‐zero temperatures (cold‐pulses) on wing development were investigated in an anholocyclic clone of the grain aphid Sitobion avenae. A cold‐pulse at –5 °C for one hour applied to first instar nymphs caused a significant reduction in the number of aphids developing to the adult stage as alates. The youngest nymphs appeared to be most sensitive to this effect. Crowding the nymphs after a cold‐pulse did not override the suppression of wing development. Prenatal cold‐pulsing also suppressed wing development in nymphs but only in those born during the first day after exposure of the parent aphids.