What triggers the development of winged aphid forms called alates?
Answer
The colony becomes overcrowded or the food source deteriorates
Winged forms develop when conditions require dispersal, typically when a colony outgrows its current location or the quality of the food source declines.

#Videos
Scouting for Aphids - YouTube
Related Questions
What is another common name for aphids?Where is the absolute best place to look for aphids when searching for an active colony?What triggers the development of winged aphid forms called alates?What sugary liquid produced by aphids do ants actively 'farm'?Which aphid species is known for feeding almost exclusively on milkweed?What indirect evidence strongly suggests the presence of an aphid colony?What type of plant tissue are aphids primarily drawn to for feeding?Besides the visible foliage, what location must be checked for certain types of aphid infestations, especially on container plants?What visual sign on a leaf strongly suggests aphids have been feeding there, even if the insects are gone?What condition makes a stressed plant an easier location for aphids to colonize?