It is called a nymph, and instar refers to the size.
A milkweed bug. I hate them
Milkweed bug
Large milkweed bug was created in 1852.
Milkweed bugs have oblong bodies that are black and orange-red in color. As its name implies, it feeds on milkweed plants. The adult milkweed bug has the ability to fly.
Milkweed bug
The effect of milkweed bug's population growth is because of the volume of space,percent of female and over reproduce.
Monarch Butterflies because they feed on milkweed and milkweed is poison.
Yerr mom!
Milkweed bugs have eggs, then several stages of nymphs, and then finally adults. The picture shows some nymphs.
They feed themselves by finding milkweed. Or they are caterpillars and once again milkweed.
The best way to get rid of milkweed bugs is via a commercially available pesticide. It is designed to quickly kill them and prevent re-infestation.
Complete