I'm right beside you, brother.
"Zygogramma Bicolorata" AKA "Parthenium Beetle" AKA "Mexican Beetle" - is a species of leaf beetle in the subfamily Chrysomelinae, native to Mexico, but introduced to India in 1984 to control Parthenium Hysterophorus (the plant in the picture), a noxious, and an invasive weed. They feed exclusively on Parthenium plants, and this makes the beetle a friendly to humans.
What makes this image different is that the adult beetle and the larvae can both be found feeding on the plant right next to each other. The larvae feeds for 10 to 15 days on leaves and on maturity enter the soil and pupate below up to 15 cm depth. The adult beetles emerge after eight to 12 days and complete their life cycle in 27 to 32 days. Both the adults and larvae are capable of feeding on the Parthenium leaves thus checking the plant growth and flower production. Immature flowers are cut by the beetles in an effort to chew the soft tissues beneath the flowers. Plants may be completely defoliated at times.
''Zygogramma bicolorata'', variously referred to as the Parthenium Beetle or Mexican Beetle, is a species of leaf beetle in the subfamily Chrysomelinae, native to Mexico, but introduced to India in 1984 to control ''Parthenium hysterophorus'', a noxious weed.