Evaluation of insecticides for the control of Helicoverpa armigera (Hübner) and Helicoverpa punctigera (Wallengren) (Lepidoptera: Noctuidae) on soybean, and the implications for field adoption

• DOI: 10.1046/j.1440-6055.2000.00190.x
• Publication Date: 2003-03-10T10:33:30Z
• Authors: Simon J Duffield; Sydney L Jordan
• Keywords: Methomyl; Helicoverpa; Bacillus thuringiensis; Biopesticide

Abstract Seven insecticides were evaluated against first‐, third‐ and fifth‐instar Helicoverpa armigera (Hübner) punctigera (Wallengren) larvae using a leaf‐disc bioassay of field‐treated soybean. Significant differences detected in age‐specific mortality, time to effect (LT50) field persistence the tested. With exception trichlorfon, mortality first‐instar was similar different treatments commercial standard, methomyl. The spinosad chlorpyrifos also that methomyl treatment, while based on Bacillus thuringiensis nucleopolyhedrovirus declined more rapidly, resulting low larvae. LT 50 biological‐based products significantly greater than those conventional products. Only showed significant activity 1 week after treatment. results suggest need for user education program highlight likely performance newer compared with chemicals which growers are familiar.