Submitted to: Arthropod Management Tests
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: June 15, 2003
Publication Date: January 10, 2004
Citation: Snodgrass, G.L., Scott, W.P., Adams, D.A. 2004. Ovicidal activity of two different insecticides on tobacco budworm and bollworm eggs, 2001.. Arthropod Management Tests. Interpretive Summary: In spray chamber bioassays two insecticides currently registered for ovicidal activity in tobacco budworm and bollworm eggs were evaluated in spray chamber bioassays. Gum zanthan was brushed onto cotton terminals leaves to stick eggs. Larvin (0.125 lb (AI)/acre) and Intruder (0.0125, 0.025, 0.038, and 0.050 lb (AI)/acre) were applied to eggs on the terminal leaves of the two worm species. At 72h, egg mortality with Larvin was 97 and 95 percent for the bollworm and budworm, respectively. At the same time egg mortality with Intruder at all rates on both worm species was 100 percent. Egg mortality in check of bollworm and budworm at 72h was 15 and 17 percent.
Technical Abstract: The efficacy of two insecticides (Larvin and Intruder) as an ovicide on bollworm and tobacco budworm eggs were determined in spray chamber bioassays. Larvin at 0.125 lb (AI)/acre and Intruder at 0.125, 0.025, 0.038 and 0.050 lb (AI)/acre were sprayed on eggs of both worm species on cotton terminal leaves. Egg mortality was observed at 48 and 72h. At 72h there was no significant difference in egg mortality in treatment with Larvin and Intruder of both worm species.