Top. A horizontal asymptote is a y-value which a function approaches. The asymptote is parallel to x axis, so is of the form y = a, for all real values of a. Thus if f(x) = y is a function, then y = a, becomes undefined for the function, then the line y = a, is called the asymptote for the function y = f(x).
The African armyworm (Spodoptera exempta) also called okalombo, kommandowurm, or nutgrass armyworm, is an African moth. It is a very deleterious pest, capable of destroying entire crops in a matter of weeks.
This spring he has received calls from Erie to Chester County and everywhere in-between about armyworm infestations in grass pastures, corn and small grain fields. They are most likely to show up in lawns that are near those fields. Armyworms do not overwinter in our area, but are prevalent in the south.