**4. Conclusion**

Viruses and viroids have an indispensable role in plant infection. In this chapter, we discussed the most major diseases that are caused by viruses and viroids. Citrus is the most important commercial crop for many countries and people who work in fields and nurseries that cultivate citrus should know about various kinds of citrus diseases especially virus diseases because most of them are controlled easily. The prevention is the first step to manage viral diseases. Furthermore, when experts have suitable information about various kinds of symptoms, they can rapidly detect a virus disease and control it and it is a very necessary requirement for each region. **Table 1** shows a summary about citrus viruses and viroids and their detection ways.


## *Citrus Virus and Viroid Diseases DOI: http://dx.doi.org/10.5772/intechopen.108578*


#### **Table 1.**

*Summary about viruses and viroids that can infect citrus trees with the way of detection and symptoms induced on citrus plants.*
