Theses and Dissertations

Issuing Body

Mississippi State University

Advisor

Byrd, John D.

Committee Member

Russell, David P.

Committee Member

To, S.D. Filip

Committee Member

Tseng, Te-Ming Paul

Committee Member

Ervin, Gary N.

Date of Degree

12-10-2021

Document Type

Graduate Thesis - Open Access

Major

Plant and Soil Science

Degree Name

Master of Science (M.S.)

College

College of Agriculture and Life Sciences

Department

Department of Plant and Soil Sciences

Abstract

Drift is a point of contention with pesticide applications, causing the need to research application methods that provide consistent efficacy while minimizing off-target movement. Experiments were conducted to evaluate eight undiluted herbicides on invasive woody plants, Chinese tallow (Triadica sebifera) and Callery pear (Pyrus calleryana), when applied individual plant treatment (IPT) via hack-and-squirt. Applications of undiluted aminocyclopyrachlor or imazapyr at 1 ml per 7.6 cm of tree diameter at breast height (DBH) made in the spring provided superior control over other herbicides or application timings. CamelBak® hydration reservoirs were evaluated for storage durability with eight undiluted herbicides. A third study was conducted to assess droplet size and distribution of Roadside Inc.’s new sprayer head for driftable fines. All nozzles were evaluated in a wind tunnel and produced droplet sizes above the benchmark for driftable fines (≤150 μm). The spray head also distributed droplets effectively from 2-30 feet from spray origin.

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