西北农林升杖大学 NORTHWEST A&F UNIVERSITY Greenbug prefers drought and fears sunlight. Most individuals found on middle leaf backside of wheat plants. Oat bird-cherry aphid likes moisture and fears sunlight.Most seen on sheathes,backsides of leaves and root-stems near ground. 88880 • Greenbug prefers drought and fears sunlight. Most individuals found on middle leaf backside of wheat plants. • Oat bird-cherry aphid likes moisture and fears sunlight. Most seen on sheathes, backsides of leaves and root-stems near ground