Submitted to: Aspects of Applied Biology
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: December 20, 2005
Publication Date: January 10, 2006
Citation: Ozkan, H.E., Zhu, H., Derksen, R.C., Guler, H., Krause, C.R. 2006. Evaluation of Various Spraying Equipment for Effective Application of Fungicides to Control Asian Soybean Rust. International Advances in Pesticides Application--Aspects of Applied Biology. 77:423-431. Technical Abstract: The Asian soybean rust (Phakopsora pachyrhizi) is a deadly disease. If not treated properly, it can cause total defoliation of the soybean canopy within two weeks. Fungicides manufactured to control soybean rust are effective. However, successful control of this disease will mostly depend on proper application of these fungicides. Unfortunately the fungicide labels fail to clearly state the spray equipment and methods that are best suited for application of rust fungicides. The objective of this study was to determine the most effective spray equipment methods for applying fungicides to soybeans to control Asian Soybean Rust. Spray coverage and deposition from 10 application equipment/spray nozzles were analyzed. In general, the spray treatment with the air assistance was more effective in spraying rust fungicides than the treatments with the conventional boom sprayer. Spray performances from the boom sprayer with a canopy opener were very similar to the air assisted spray treatments, and were better than other treatments with the boom sprayer. Twin jet, Turbo Dual pattern and hollow cone nozzles produced lower spray performances than conventional flat fan nozzles. For treatments with the boom sprayer, medium spray quality provided higher spray coverage inside canopies than coarse and fine spray qualities. Future research will address how much fungicide inside canopies can be sufficient to control the soybean rust disease.