Chrysodeixis includens

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Chrysodeixis includens larva on cotton (click on image to enlarge it)
Author(s): Russ Ottens, University of Georgia
Source: Wikimedia Commons

Chrysodeixis includens (Walker, 1858) - (soybean looper)

The looper is a serious soybean pest in America, it also attacks other crops. The caterpillars consume large amounts of soybean foliage, can defoliate soybean plants and can cause yield losses of up to 30%. In North America, populations overwinter in the southern areas, or in Central America, and then migrate north to soybean and cotton areas. There is no diapause. The development from egg, through 6 larval stages, to mature adults lasts around 1 month. There are 3-4 generations per year.

Populations can be monitored with pheromone or light traps. In soybean, management action is recommended if 35% defoliation has been reached before flowering, or when 20% defoliation occurs during the pod-filling stage. There is a large number of natural enemies which often result in effective control and need to be preserved. Lepidopteran-specific insecticides are recommended. Several populations have developed resistance to specific pesticides.

Vernacular names
• English: soybean looper
• Español: falso medidor de la soja
• Português: lagarta-falsa-medideira

The adult is mottled in different shades of brown and grey and has a wing span of 3-4 cm. There is a light figure 8 mark (sometimes separated into 2 marks) in the middle of the forewing. The hindwings are lighter. The caterpillars are light green with whitish longitudinal stripes along the sides and the back.

Synonyms:
Plusia oo
Pseudoplusia includens