Seasonal occurrence of aphids and natural enemies in wheat and associated crops

We monitored experimental plantings of winter wheat and 12 other grain and forage crops for aphids and aphid natural enemies throughout the growing se ason of each crop for three years. Sorghum (Sorghum vulgare Prescott), cott on (Gossypium hirsutum L.), and winter canola (Brassica napus L.) hosted ap hids and predators and parasitoids of cereal aphids during summer months. W inter canola also harbored aphids and predators and parasitoids cereal aphi ds during autumn and winter. Legumes harbored aphids and natural enemies ne arly the entire year. However, parasitoids that attacked aphids in legumes did not parasitize cereal aphids in winter wheat except for the English gra in aphid. Sitobion avenae (F.), which was an uncommon species in winter whe at.