Comparison of Aerially Applied Finished Spray Rates for Cotton Insect Control

Darryl Rester, B. Roger Leonard, Larry Beckwith, Marion Farris, and Carol Pinnell-Alison


A large plot field test was conducted to examine the efficacy of insecticide treatments aerially applied in finished sprays of two and five gallons/acre (GPA) against the bollworm (BW), Helicoverpa zea (Boddie), and tobacco budworm (TBW), Heliothis virescens (F.) complex. Three paired fields (30-60 acres) in Franklin and Richland Parishes of Northeast Louisiana were treated during 1993 with multiple (three) applications of insecticides recommended for control of BW-TBW. The fields were treated with Cessna(®) Ag Husky or Ag Truck aircraft. Nominal swath widths of 60 and 55 ft were used for the two and five GPA treatments, respectively. These fields were sampled three to five days after treatment for BW-TBW and boll weevil infestations and damage by examining 500 plant terminals and 1000 flower buds (squares)/plot. Plots treated with five GPA had significantly fewer plant terminals and fruit infested with larvae and less square damage from BW-TBW and boll weevil compared with plots treated with two GPA. Although the results of these tests are from a single year, the data support previous research that shows water-based finished spray volumes of five GPA can improve insecticide efficacy against cotton insect pests compared to lower application volumes of water based sprays. Using higher water-based finished spray rates will reduce the probability of BW-TBW insecticide control failures by improving application efficiency.

Reprinted from Proceedings of the 1994 Beltwide Cotton Conferences pp. 1128 - 1131
©National Cotton Council, Memphis TN

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Document last modified Sunday, Dec 6 1998