DIMBOA imparts resistance against:

Correct option is A

What is DIMBOA?
DIMBOA stands for 2,4-dihydroxy-7-methoxy-1,4-benzoxazin-3-one.
It is a naturally occurring benzoxazinoid compound found predominantly in maize (corn) and some related grasses like wheat and rye.
DIMBOA is a phytoanticipin – a type of chemical that provides preformed, broad-spectrum defense against pests and pathogens.
�� DIMBOA’s Role in Insect Resistance:
DIMBOA confers antifeedant and toxic effects on many maize pests.
It is especially effective against:
European corn borer (Ostrinia nubilalis)
Corn leaf aphid
Western corn rootworm
It disrupts insect digestive and nervous systems, reducing survival and reproduction.
✅ Thus, DIMBOA provides biochemical resistance against corn borers, making it an important component in maize's natural pest defense.
�� Explanation of Options:
(a) Corn borer – ✅ Correct, DIMBOA is specifically effective against corn borers.
(b) Cotton bollworm – ❌ A pest of cotton; DIMBOA is not associated with cotton defense.
(c) Army worm – ❌ DIMBOA has limited or no specific toxicity to armyworms.
(d) Shoot fly – ❌ Common in sorghum and millets; not targeted by DIMBOA.