Effectiveness of Selected Ovicides Against the Bollworm-Tobacco Budworm Complex on Cotton

John A. DuRant


 
ABSTRACT

Ten insecticide treatments were evaluated in a field study for efficacy against Helicoveripa zea (Boddie) and Heliothis virescens (F.) eggs and newly hatched larvae on cotton foliage. Treatments were applied on July 11, 1990 and white (newly laid) eggs were collected on July 11, 12, 13, and 14 and observed for ovicidal and eclosion mortality. All treatments (lb[AI]/acre) were significantly superior to the untreated for the July 11 eggs: Asana (0.03), Lannate (0.125), Ovasyn (0.125), Curacron (0.25), Larvin (0.125), Scout (0.018), Karate (0.025), Baythroid (0.028), Scout + Ovasyn (0.018 + 0.125), and Scout + Larvin (0.018 + 0.125).For the July 12 eggs, all treatments except Lannate and Curacron significantly increased total mortality over the untreated. For the July 13 eggs, only Lannate and Curacron failed to increase both ovicidal and total mortality over the untreated.Total mortality and ovicidal mortality for the July 14 eggs were increased significantly by Scout, Karate, Baythroid, Scout + Ovasyn, and Scout + Larvin.



Reprinted from 1991 Proceedings Beltwide Cotton Conferences pp. 748 - 749
©National Cotton Council, Memphis TN

[Main TOC] | [TOC] | [TOC by Section] | [Search] | [Help]
Previous Page [Previous] [Next] Next Page
 
Document last modified Sunday, Dec 6 1998