Soybean leafminer: Soybean leafminer, Odontota horni.
The adult soybean leaf miner is a small, flattened, squarish beetle. Its underside is black and the top of the insect is brick red and its head is black. In addition to its unique shape and coloration, there is also a thin black stripe that extends down the middle of its forewings beginning at the base of its prothorax. Note that the black stripe does not quite extend to the tip of the thorax. Another similar beetle the locust leafminer, Odontota dorsalis, is occasionally found in soybean (especially near locust trees); however, it is much less common. The locust leafminer looks similar except the black dorsal stripe widens toward the tail-end of the beetle and extends to the end of the forwings.
Larvae reach a maximum of 7 mm long, is cream-colored with a dark brown head and lateral tubercles. Typically, the larvae are not found exposed on the surface of the leaf, rather they mine within the layers of the leaf.
Soybean leafminer larva: Soybean leafminer larva.
larval soybean leafminer injury: Larval injury to a soybean leaf from the soybean leafminer.
Pupae are similar to the larvae in color and can be easily seen through the translucent pupal chamber within the leaf.