西北农林升枚大学 4.Life Cycle NORTHWEST A&F U时VERSITY 1)Wheat Aphids Cereal crop aphids have both holocyclic life cycles and anholocyclic life cycles. >Holocyclic life cycles in northern cold areas;anholocyclic life cycles in southern warm areas. 10-20 generations annually;number 888880 varies with the wheat planting areas 1) Wheat Aphids Cereal crop aphids have both holocyclic life cycles and anholocyclic life cycles. Holocyclic life cycles in northern cold areas; anholocyclic life cycles in southern warm areas. 10-20 generations annually; number varies with the wheat planting areas 4. Life Cycle