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Pink stem borer

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The pink stem borer, Sesamia inferens is found in the Indian subcontinent, China, and Southeast and East Asia. It feeds on rice, sugarcane, maize, wheat, barley, and grasses.

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The adult pink stem borer deposits its eggs between the leaf sheath and the stem. Of all the species, pink stem borer eggs are probably the most effectively protected. The beadlike eggs are laid in rows, usually 30-100 per batch. The incubation period is about 8 days.

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The larva has an orange-red head.  Its body is purplish-pink dorsally and white ventrally.  The larva is fully grown in about 22 days.

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The pupa is dark brown with a tinge of purple in the head region. Pupation is completed in about 8 days.

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The adult is light brown-colored with dark brown markings. From a central point in the forewing, a typical radiation of greyish black spreads toward the wing tips, ending in a thin terminal line of dark spots. The hindwings are white.

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The pink stem borer requires about 38 days to complete development.

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