The dynamics of Helicoverpa populations : can we predict ?
    Fitt, Gary P., Dillon,  Martin L., Gregg,  Peter C., Zalucki,  Myron P., Murray,  ,  David A.H. (1992-08-11)
    Helicoverpa punctigera (Wallengren) and H. armigera (Hubner) have a number of characteristics which make them highly successful pests of numerous crops in Australia, including cotton (Fitt 1989).