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During this feeding period, larvae thrives on dry grain diet. At 28'C, larval stage lasts around 1-1.5 weeks before they start spinning web into cocoon and become pupae.
Sexing Plodia Larvae
Male Plodia larvae can be distinguished from its female counterpart by the presence of two dorsal red dots indicating their testicular mass.
Pupal stage lasts for about 1-1.5 week at 28'C. At the end of wandering larval stage, larvae will spin silk around themselves. Once their pupal case is hardened enough, it is safe to open the cocoon and take out the pupa inside. Pupal staging is easily done by their body, eye, tarsal claw, and wing color progression from cream, tan, to dark brown. Zimowska et al (1991) described in detail how to stage the pupae through observable outer structure.
Sexing Plodia Adults
Apart from the morphological differences illustrated above, male and female Plodia also show difference in pre-mating behaviors. Females will bend their abdomen upwards to call males for mating using their pheromones. As a response, males will flap their wings to court the nearby female.