.png){kind=small}
Biological Control of Lepidoptera pests
Lepidopteran pests are destructive insects belonging to the order Lepidoptera, which includes all moths and butterflies.
While adult moths and butterflies are usually harmless to plants, their young (caterpillars) have chewing mouthparts designed to devour plant tissue, fruit, and leaves rapidly.
Key Life Stages & Behavior
Larvae (Caterpillars): This is the stage that causes almost all the agricultural and garden damage. They feed continuously to fuel their growth.
Adults (Moths/Butterflies): Mostly feed on nectar and lay eggs on host plants, starting the cycle over again. Pheromone traps specifically target adult male moths to break this breeding cycle.
Pest Name | Local / Common Host Crops | Type of Damage |
Fall Armyworm (Spodoptera frugiperda) | Maize, sorghum, sugarcane | Caterpillars eat deep into the central leaves (whorl) and bore into young maize cobs. |
Tomato Leafminer (Tuta absoluta) | Tomatoes, potatoes, eggplants | Larvae burrow between leaf surfaces creating silvery trails and bore tunnels inside the fruit. |
African Bollworm (Helicoverpa armigera) | Tomatoes, cotton, beans, maize ears | Caterpillars bore directly into green tomato fruits, cotton bolls, and maize cobs. |
Diamondback Moth (Plutella xylostella) | Rape, cabbage, kale, cauliflower | Caterpillars chew small holes into brassica leaves, leaving a "windowpane" effect. |
False Codling Moth (Thaumatotibia leucotreta) | Citrus fruits, chillies, avocados | Caterpillars tunnel inside the fruit causing soft spots, early decay, and fruit drop. |
Lepidopteran pests remain a major production constraint in Zambia's commercial maize and vegetable industries. Frequent insecticide applications have increased concerns regarding resistance development, beneficial insect disruption and residue management. Integrating biological control agents into an Integrated Pest Management (IPM) programme provides growers with an effective and sustainable alternative.
Fall Armyworm (Spodoptera frugiperda) in Maize
Fall armyworm remains one of the most economically important pests of maize throughout Zambia. Young larvae initially feed on leaf surfaces before migrating into the whorl, where they become increasingly difficult to reach with conventional insecticide applications.
Larvanem is Koppert's biological insect control product containing the entomopathogenic nematode Steinernema carpocapsae. Larvanem performs best when applications target the early larval stages before extensive feeding damage has occurred. The nematodes are capable of moving within the moist environment of the maize whorl, actively searching for concealed larvae. Good spray coverage into the whorl is essential to ensure adequate contact between the nematodes and the target pest. Routine scouting should commence soon after crop emergence, with applications initiated as soon as economically significant infestations are detected. Early intervention substantially improves biological control success.
Tuta absoluta in Tomatoes
Tuta absoluta is capable of completing multiple generations during the growing season, allowing populations to increase rapidly if left unmanaged. Larvae mine leaves before attacking stems and fruit, resulting in direct yield and quality losses.
Larvanem should be incorporated into a preventative IPM programme targeting newly hatched and young larvae before they become deeply established within plant tissue.
Thorough spray coverage is critical, particularly on the undersides of leaves where eggs and young larvae are commonly found. Successful management should combine Larvanem applications with regular crop monitoring, pheromone trapping for population surveillance, removal of heavily infested plant material, and the conservation of naturally occurring beneficial insects.
Cutworms in vegetable seedlings
Several cutworm species attack newly transplanted and direct-seeded vegetable crops by feeding on stems at or below the soil surface.
Damage is often severe during crop establishment, resulting in significant stand losses. Larvanem is ideally suited for soil applications targeting larvae in their feeding zone. Uniform application followed by irrigation, where appropriate, helps move the beneficial nematodes into the upper soil profile where cutworms are active. Maintaining adequate soil moisture after application improves nematode survival and mobility. Preventative applications in fields with a known history of cutworm infestations generally provide the greatest level of protection.
By targeting susceptible larval stages early and integrating biological control with sound agronomic practices, commercial growers can achieve reliable suppression of economically important Lepidopteran pests while supporting long-term sustainability and reducing dependence on broad-spectrum insecticides.
Comments