-Larvae have four instars with a development period of 3-4 days
-First instar feeds by mining and emerges from the mines leaving irregular patches of damage while the upper epidermis remains intact creating a window pane effect.
-Pupation occurs in loose silk cocoon before the adult emerges.
-This pest is restricted on crucifers’ vegetables which contain mustard oils and glucosides.
-It s distribution is cosmopolitan.
-Takes 25-30 days to develop from the egg to pupa.
-Development depends on weather and generations vary with climate.
-Starts laying eggs immediately after mating.
-Eggs are deposited singly or small of 2-8.
jim items answered the question on March 11, 2019 at 15:40
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