How does DIMBOA help corn plants?

DIMBOA (2,4-dihydroxy-7-methoxy-1,4-benzoxazin-3-one) is a natural compound found in corn that plays a significant role in the plant's defense mechanisms. It is particularly effective against herbivorous insects, including the first generation of the European corn borer. This compound contributes to the plant's resistance by acting as a feeding deterrent, thereby reducing the likelihood of infestation and damage by these pests.

While it’s true that DIMBOA does not repel all insect pests, its specific effectiveness against the European corn borer highlights its importance in integrated pest management strategies for corn crops. Moreover, the other options relating to growth rate and soil moisture retention do not directly tie to the protective functions of DIMBOA, making the second option the most accurate in the context of its role in pest resistance.