Lemon Tree Diseases and Pests


Lemon trees (Citrus limon) are popular in home gardens both for their decorative appeal and their versatile fruits. The elliptical leaves are dark green on top and light green underneath, and the white flowers have purple undersides. Lemon trees, like other citrus trees, are susceptible to various diseases and pests.

Lemons are the fruit of lemon trees. image by "Lemons" is Copyrighted by Flickr user: comingstobrazil (Andrew Comings) under the Creative Commons Attribution license.

Citrus Whitefly

Citrus whiteflies are tiny white insects that damage lemon trees by sucking sap from the leaves. This causes the affected leaves to yellow and curl.

Other Pests

Citrus trees are also vulnerable to California red scale (Aonidiella aurantii) and purple scale (Lepidosaphes becki). These pests are most prevalent in humid, mild climates.

Citrus Tristeza Virus

Citrus tristeza virus (CTV) is a destructive lemon tree disease that stunts the size of the fruit. This disease also causes cupped, yellowed leaves and pitted stems.

Other Diseases

Lemon trees are prone to several leaf diseases, including leaf spot (Mycosphaerella horii) and algal leaf spot (Cephaleuros virescens). Potential root diseases include charcoal root rot (Macrophomia phaseolina) and root rot (Fusarium oxysporum).


A majority of lemon tree problems can be treated effectively with fungicides or insecticides. Trim off diseased or infected foliage and dispose of away from other plants.


  • Citrus Whitefly
  • Citrus Tristeza Virus
  • Citrus Nemotodes

Who Can Help

  • Lemon Tree Pests and Diseases
  • Lemon Trees
Keywords: lemon tree diseases and pests, lemon tree disease, lemon tree pests, diseases and pests of lemon trees, diseases of lemon trees

About this Author

Cat Carson has been a writer, editor and researcher for more than 10 years. She has professional experience in a variety of media, including the Internet, newspapers, newsletters and magazines. Her work has appeared on various websites. Carson holds master’s degrees in both writing and cultural anthropology, and is currently working toward her doctorate degree.