Stick insects

In global agriculture, they are primarily known as pests of tropical and subtropical vegetation. They cause considerable damage to crops such as tea bushes, citrus trees, and various ornamental species. In regions with colder climates, they are often problematic pests in greenhouses and indoor plant collections.

The biology of these pests is characterized by incomplete metamorphosis, consisting of egg, nymph, and adult stages. Females lay eggs either in the soil or directly on host plants. These eggs are often highly resistant to environmental stressors, allowing the population to persist even after insecticidal treatments.

The damage is caused by both nymphs and adults feeding on foliage. They consume leaf margins or entire blades, which can lead to rapid defoliation of the host plant. This intense feeding reduces the plant's photosynthetic capacity, resulting in weakened growth, yield loss, and potential plant mortality.

Effective management includes the following strategies:

• Regular monitoring of plant foliage for physical damage or presence of insects.
• Manual removal of adults and nymphs in smaller greenhouse settings.
• Application of contact or systemic insecticides to manage large-scale outbreaks.
• Strict quarantine and inspection of new nursery stock to prevent accidental introduction.

Integrated pest management (IPM) is crucial, as the natural camouflage of Phasmatidae often allows them to evade early detection. Maintaining clean growing environments and minimizing the presence of alternative host plants near production areas are also essential preventive measures.