Field evaluation of a Tri-Set spray nozzle for aerial application and discussion on release of biological control agents

Abstract

Abstract: Efficiency and efficacy of aerial application of liquid formations has been studied extensively in terms of optimal nozzle/atomizer setups, adjuvant mixes, weather conditions, and aerial spray release heights. In past studies, we have evaluated CP-11 flat-fan nozzles to assess impact factors of in-swath and downwind deposition from aerial spray application, and a solid stream radial Accu-Flo nozzle to determine penetration of the spray within crop canopy. When applying liquid tank mixes from aerial platforms, there are numerous nozzle types available with differing spray characteristics. More information is needed, however, on the ability of aerial delivery systems to effectively apply biological agents. The release of non-toxigenic A. flavus into corn fields has shown promise as a biological control agent for aflatoxin producing strains of the fungus. However, the application of a coarse granule to mature, two-meter-tall corn is a challenge. Thus, there would be substantial advantages to a liquid formulation with necessary identification of appropriate adjuvants to disperse the highly hydrophobic spores of A. flavus. This paper presents the experiment and preliminary data analysis of testing and evaluating Davidon tri-set nozzles under various nozzle configurations, and discusses what we need to know for effective use of different nozzles for potential application of biological control agents, especially Afla-Guard®, a commercially available product containing non-toxigenic A. flavus as a biological control agent, and related products into corn fields. Keywords: aerial application, crop protection, nozzle evaluation, biological control agents DOI:  10.33440/j.ijpaa.20200302.75  Citation: Huang Y B, Thomson J S. Field evaluation of a Tri-Set spray nozzle for aerial application and discussion on release of biological control agents.  Int J Precis Agric Aviat, 2020; 3(2): 40–47.