Author：Wang Chia-Yu/Project Assistant, Taiwan Agricultural Research Institute
Yao Mei-Chi/Associate Research Fellow, Taiwan Agricultural Research Institute
Bananas can be harvested throughout the year. During the cultivation, in addition to plant diseases, pests also pose a major challenge for banana farmers. These tiny pests may seem negligible at first glance, but their impact on the banana industry can be quite substantial. Four newly listed insect pests known to damage banana leaves are now featured in this update of the Smart Pest and Disease Management and Decision System. To illustrate the extent of their threat, we’ve prepared a diagram of a heavily infested banana plant. Each pest is labeled along with a description of the specific damage it causes, making it easy for farmers to recognize the signs at a glance. Interested in learning more or looking for pest control strategies? Simply scan the QR code to access further information (see Figure 1). Now, let’s embark on a journey to explore the fascinating—yet troublesome—world of banana pests!
Figure 1. What’s Happened to the banana leaves? – Overview of pests and the damage they cause to banana plants.An Overview of the Newly Featured Banana Pests in the System
1. Banana Aphids (Pentalonia nigronervosa): These tiny aphids may be a nightmare for banana growers. Though small in size, they have quite an appetite. They typically cluster in concealed areas such as the innermost heart leaves, tender stems, petiole bases, and the inner side of leaf sheaths on young banana plants. Using their piercing-sucking mouthparts, they feed on the plant’s sap. Furthermore, they excrete honeydew, which promotes the growth of sooty mold, hindering photosynthesis and thereby affecting banana growth and development.
2. Banana Skipper (Erionota torus): The caterpillar stage of this pest is grayish-green and covered with a waxy white powder. It feeds on banana leaves and rolls the leaf blades into tubular shelters for hiding. This behavior causes large areas of leaf damage (see Figure 2), significantly reducing the plant’s photosynthetic efficiency.
Figure 2. Erionota torus caterpillars roll up leaves into tubes to hide inside (left), causing extensive damage to the leaf surface (right).3. Spider Mite (Tetranychus piercei): These microscopic mites are frequent visitors in banana-growing regions. They usually inhabit the undersides of banana leaves and feed on the sap. Heavy infestations lead to grayish-white or yellowing leaves, eventually resulting in leaf desiccation and death.
4. Banana lacebug (Stephanitis typica Distant): Both nymphs and adults gather on the underside of leaves to suck sap and excrete dark brown fecal matter, which contaminates the leaf surface (see Figure 3). In severe cases, damaged leaves first show yellow-white discoloration, then develop rust-colored blotches (see Figure 4). This pest also reduces photosynthetic efficiency, yet it is actually quite beautiful under the microscope—the adult’s wings are net-like and sparkle like crystals (see Figure 5). The nymphs look entirely different from the adults, with spiny bodies and a striking appearance.
Figure 3. Nymphs and adult pests cluster on the underside of banana leaves (left), leading to leaf contamination (right).
Figure 4. Affected leaves initially show yellowish-white discoloration, later turning into rust-colored blotches.
Figure 5. Adult (left) and nymph (right) stages of banana lacebugThese four insect species are among the most common pests in banana-growing regions, though many other pests may also affect the health and quality of banana crops. Farmers are strongly advised to monitor and manage these pests closely to ensure high yield and quality.
By observing the symptoms and comparing them with the illustration provided, readers and farmers can identify the pest species. For those interested in learning more about each pest’s ecology, symptoms, and control methods, please scan the QR codes on the diagram to access further information. In addition, the Smart Pest and Disease Management and Decision System includes comprehensive data on key pests and diseases affecting other crops as well. Stay updated by following the system and its official Facebook page (see Figure 6) for the latest insights on agricultural issues and pest management. Regular updates and new pest entries will continue to be published!
Figure 6. Three main channels for pest and disease information and alerts (A. Smart Pest and Disease Management and Decision System; B. LINE Chatbot for Pest and Disease Consultation; C. Facebook Fan Page)
