Which two aphids are primarily responsible for spreading barley yellow dwarf virus in Oklahoma?

The correct choice identifies the bird-cherry oat aphid and greenbug as the primary vectors responsible for the transmission of barley yellow dwarf virus (BYDV) in Oklahoma. These two aphids are significant in agriculture because they not only feed on various grasses, including barley, but also have a strong relationship with the virus. The bird-cherry oat aphid is known for its ability to effectively spread BYDV because it can acquire the virus while feeding on infected plants and subsequently transmit it to healthy plants. Similarly, the greenbug also plays a crucial role in the epidemiology of BYDV, contributing to its spread through its feeding behavior.

Understanding the specific aphids involved is vital for management strategies in farming practices, particularly in regions like Oklahoma where barley is cultivated. By targeting these aphid species, agronomists can implement measures such as using resistant crop varieties or applying insecticides to manage aphid populations and reduce the incidence of the disease in barley crops.

In the context of barley yellow dwarf virus, knowing the correct aphid vectors allows for more efficient monitoring and control measures, which can help to minimize the impact of the virus on crop yields.