"The Use Of Stalks Syrup. – Most of the different plants of the grass family have hollow stems, but there are three notable exceptions: sorghum, sugar cane, and corn. All three contain cane sugar. The Aztecs in Mexico made use of the corn plant for sugar, in the same manner as sugar cane is now used.
In a Minnesota experiments five varieties of sweet com and two of field com were used. When the com is ripe enough to can, the juice of the stalks contains 9-11 per cent cane sugar. If the stalks stand in the field twenty days after the removal of the ears, the amount of sugar in the stalk increases to 13-17 per cent. The proper stage for syrup-making is during the time of maximum amount of sugar in the juice, not only because of the yield but because of the quality of the juice. Cornstalk syrup may be manufactured by nearly the same process as sorghum syrup. Cornstalk syrup is clear, reddish amber in color, with a pleasant flavor. As produced, it is not a table syrup but an excellent cooking syrup considered equal to the best grades of sorghum and cane molasses". A link to the abstract is here.
So, while we consider these insects to be simply randomly meandering around, they are driven to seek food and shelter. All we have to do is watch and learn. Ken