1997, Rosamond L. Naylor, Paul R. Ehrlich, Chapter 9: Natural Pest Control Services and Agriculture, Gretchen Daily (editor), Nature's Services: Societal Dependence On Natural Ecosystems, page 156, Cumulative losses from the brown planthopper have been estimated in the hundreds of millions of dollars (Denno and Perfect 1994) and accounted in 1990 for some 6 percent of the total value foregone from all biotic and abiotic factors that reduce rice production (Herdt 1991).
Source: wiktionary