
%0 Journal Article
%A Hamilton, JT 
%A Muirhead, WA 
%T Chemical control of <I>Heliothis armiger</I> (Hubner) in sweet corn
%J Australian Journal of Experimental Agriculture
%D 1981/04/01
%V 21
%N 109
%P 231-235
%K 
%R https://doi.org/10.1071/EA9810231
%U https://www.publish.csiro.au/paper/EA9810231 
%X Four trials were conducted at Griffith, New South Wales for the control of the corn ear worm, Heliothis armiger, in sweet corn. A screening trial, where sprays were applied at 50% silking and 7 days later, showed that the pyrethroids permethrin and fenvalerate were the most effective chemicals. The insecticides used (g active ingredient ha-1) and the percentage of cobs damaged in each treatment were as follows: permethrin 100- 15%; fenvalerate 100- 17%; methomyl 450-22%; sulprophos 720-25%; methomyl 340-30%; monocrotophos 800-33%; CGA 15324 750-34%; endosulfan 740-39%; acephate 750-39%; chlorpyrifos 750-55%. Permethrin and fenvalerate were also found to be effective at rates of 50 and 75 g a.i. ha-1. Applications during the tasselling and early silking stages were more effective than sprays during the later silking stages. 
