[1] They are parasites of plants, and three species are pests of agricultural crops.

[2] They have large stylets with knobs shaped like anchors or tulips.

[1] The main agricultural pest species are H. columbus, H. galeatus, and H.

[2] H. columbus infects such crops as cotton, soybean, and corn.

H. galeatus can be found in many crops, as well as many species of pine trees and grasses.