Common Meyer Lemon Plant Diseases:
How to Identify and Treat

Meyer lemon plants are a popular choice for home gardeners due to their deliciously fragrant fruit and adaptability to various climates. However, like all plants, Meyer lemon trees are susceptible to diseases that can impact their health and productivity. In this article, we will discuss some of the most common diseases that affect Meyer lemon plants, how to identify them, and the best treatments to ensure your lemon tree thrives.

Citrus Canker

Citrus canker is a highly contagious bacterial disease that affects many citrus plants, including Meyer lemon trees. It is characterized by raised corky lesions on the leaves, stems, and fruit of the plant. These lesions may have a water-soaked appearance and can become corky and scaly as they age. In severe cases, the fruit may become distorted or drop prematurely.

To control citrus canker, it is essential to prune and destroy any affected branches or fruit. Disinfect pruning tools after each cut to prevent spreading the disease further. Copper-based sprays can also be applied to infected areas as a preventative measure.

Citrus Leaf Miner

Citrus leaf miner is a common pest that affects many citrus trees, including Meyer lemon plants. While not technically a disease, the damage caused by citrus leaf miners weakens the tree and makes it more susceptible to diseases and other pests.

The larvae of citrus leaf miners tunnel through the leaves of the plant, creating silvery trails or winding paths that are easily visible. This damage can cause the leaves to curl or drop prematurely. To control citrus leaf miner infestations, regularly inspect your Meyer lemon tree for signs of damage. Prune and destroy affected leaves or use insecticidal sprays specifically formulated for citrus leaf miners.

Phytophthora Root Rot

Phytophthora root rot is a fungal disease that affects the roots of many plants, including Meyer lemon trees. It thrives in poorly drained or overwatered soil and can cause severe damage if left untreated. Symptoms of phytophthora root rot include yellowing leaves, stunted growth, and a decline in overall vigor. The roots may also appear dark, mushy, or rotting.

To control phytophthora root rot, it is crucial to improve soil drainage and avoid overwatering. Fungicides containing fosetyl-aluminum can be applied to the soil to help suppress the disease. Additionally, removing infected plants and their surrounding soil can prevent the spread of the fungus.

Citrus Black Spot

Citrus black spot is a fungal disease that affects the fruit of citrus trees, including Meyer lemons. It causes dark, sunken lesions on the fruit’s skin, which can reduce its market value and make it unappealing for consumption. The disease is most common in humid climates.

To control citrus black spot, it is essential to remove any infected fruit from the tree and surrounding area. Fungicides containing azoxystrobin or copper can be applied preventatively to protect against future infections. Proper pruning and thinning of branches can also improve air circulation and reduce humidity, making the tree less susceptible to the disease.

Alternaria Brown Spot

Alternaria brown spot is another fungal disease that affects the fruit of citrus trees, including Meyer lemons. It causes circular brown spots on the fruit’s skin, often surrounded by a yellow halo. Over time, these spots can enlarge and become sunken or corky in texture.

To control alternaria brown spot, it is important to remove any infected fruit from the tree and dispose of it properly. Fungicides containing azoxystrobin or copper can be applied during periods of high humidity to prevent new infections. Pruning the tree to improve air circulation and reducing overhead watering can also help reduce the risk of alternaria brown spot.

Conclusion

While Meyer lemon plants are generally hardy and resistant to many diseases, several common ailments can still affect their health and productivity. By familiarizing yourself with the symptoms of these diseases and taking appropriate action, you can effectively control and treat them. Regular inspection, proper pruning, and the use of preventive measures such as fungicides and insecticides will help keep your Meyer lemon tree thriving for years to come.