What disease is caused by the Citrus tristeza closterovirus?

Citrus tristeza is the disease caused by the Citrus tristeza closterovirus. This virus is known to severely affect a wide range of citrus species and can lead to significant economic losses in the citrus industry. The disease is characterized by symptoms such as graft union failure, stunted growth, and yellowing leaves. In some cases, it can even cause tree death, particularly in certain rootstock varieties that are highly susceptible to the virus. Understanding the specific pathogens that cause diseases is crucial for developing effective management strategies, which makes identifying Citrus tristeza as the correct answer essential for pest control advisement in citrus production.