Bean podborer (Mung moth)
Maruca vitrata

Maruca vitrata is a pantropical insect pest of leguminous crops like pigeon pea, cowpea, mung bean and soybean.  

These destructive pests begin their rampage as larvae or grub-like caterpillars, which eventually morph into tiny moths. 

These larvae are about 7/8 inch long, bluish green with a pink tinge to the backside and a yellowish brown plate behind the dark head.