Soybean Looper

Disease

Soybean Looper

Pseudoplusia includens

insect

In a Nutshell

    Characteristic feeding damage on leaves called 'Feeding windows'Feeding damage developing from the leaf margin in later stageDefoliation of the plant at high population densities

Hosts: %1$s

· Gram · Soybean

Symptoms

Damage comes from caterpillar feeding on plant parts. Young larvae feed first on the underside of leaves and spare the upper part, resulting in a clear window-like feeding pattern sometimes referred to as ‘feeding window'. Older larvae feed on the entire leaf from its margins, and rarely attack flowers or pods. Heavy infestations can completely defoliate the plant. Pupae spin a loose cocoon on the underside of leaves.

Trigger

The female moth deposits eggs on the undersides of eaves. Eggs hatch after 3 days. Larvae develop through 6 larval stages in about 15 days. The larvae are green with white stripes along their flanks. Sometimes, small dark spots spread on their body. They are characterized by three pairs of legs unevenly distributed along the body (2+1), forcing them to walk forming “loops”. The moth is dark brown with two small little eyespots on the forewings.

Biological Control

Apply products based on Bacillus Thuringiensis to control loopers.

Chemical Control

Always consider an integrated approach with preventive measures together with biological treatment if available. Monitor the field regularly and only employ chemical control if strictly necessary. Apply insecticides containing methoxyfenozide and spinetoram prior to full bloom. Avoid pyrethroids or acephate.

Preventive Measures

    Use tolerant or resistant varietiesPlant early and use varieties that mature early to avoid worst damage




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