Chrysanthemum aphid

Systematic position: The chrysanthemum aphid (Capitophorus minor) is classified within the order Hemiptera and the family Aphididae. It is a specialized pest that has evolved to feed primarily on various species of the Chrysanthemum genus, making it a significant challenge for professional floriculture and home gardening.

Host plants: This aphid species primarily infests chrysanthemum plants. It is commonly found in greenhouses, nurseries, and outdoor landscapes. The insects prefer the most succulent parts of the plant, such as the youngest leaves at the growing tips and developing flower buds, where nutrients are highly accessible.

Biology and life cycle: The life cycle involves multiple generations per year. Under favorable greenhouse conditions, Capitophorus minor reproduces year-round through parthenogenesis. In outdoor environments, they overwinter as eggs on plant debris. Due to their rapid reproductive rate, a small initial infestation can quickly develop into a massive colony, covering large parts of the plant surface.

Damage and pest impact: Feeding by aphids causes severe physiological stress to the plant. The withdrawal of phloem sap leads to:

• Stunting of growth.
• Curling and yellowing of the leaves.
• Deformation of stems and flower heads.
• Secondary infections of sooty mold on the honeydew secreted by the aphids.

Control measures: Management involves a combination of monitoring and chemical intervention. Early detection is crucial to prevent widespread outbreaks.

• Regular inspection of the undersides of leaves.
• Removal and destruction of heavily infested plant parts.
• Application of selective systemic insecticides.
• Usage of biological controls like predatory wasps or ladybirds in integrated pest management programs.