Bean podborer (Mung moth, Lima bean pod borer, Maruca pod borer)
Maruca vitrata (Maruca testulalis)
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.
List of symptoms/signs
Fruit - internal feeding
Inflorescence - webbing
Leaves - webbing
Round holes are produced in the corolla of the flowers by the larvae; the pods are distorted by larger larvae and affected by frass. Damage is caused by the larvae boring round holes in the corolla; flowers are converted to a mass of brownish frass in 24 hours.