Hello! The lemon tree is attacked by scale insects (Scale insects in ornamental plants - pest management).
The “glue” on the leaves is called “honeydew” and is a transparent, sticky substance that is secreted by the scale insects (it represents their sweet droppings).
For control, insecticide treatments such as , in a dose of 7.5 ml/10 L water and , in a dose of 3 g/10 L water are recommended. Two treatments can be carried out, alternating the two products, at intervals of 5-7 days between them. More precisely, if you carry out the first treatment with , you can carry out the second treatment with , 5-7 days after the first one. To increase the effectiveness of the insecticides, it is advisable to add an adjuvant such as , in a dose of 2 ml/10 L to the solutions. Spray the solution as finely as possible, so as to achieve an even distribution on the plant, both on the topside and on the underside of the leaves, as well as on the stem. After they die, these pests remain on the stem and leaves, so it is advisable to remove them with a damp sponge.
7-10 days after the treatments, it is advisable to use a maintenance product such as or , applied directly by spraying. It supports the regeneration of plants after certain stressful conditions, or if they have suffered from pest attacks.
Additionally, you may consider using a fertilizer that is specially formulated for the nutritional requirements of citrus plants, such as , in a dose of 10 ml/1 L water. This is applied by watering once a week during the growing season to stimulate the regeneration and healthy growth of the lemon tree.
For proper growth, it is important to follow the environmental and care requirements specific to citrus plants, detailed in our article: Citrus, plant care and growing guide.