Theses and Dissertations

Mary Huff

Issuing Body

Mississippi State University

Advisor

Cook, Donald

Committee Member

Catchot, Angus L.

Committee Member

Gore, Jeffrey

Committee Member

Musser, Fred R.

Committee Member

Irby, Jon Trenton

Date of Degree

5-1-2020

Document Type

Graduate Thesis - Open Access

Major

Agricultural Life Sciences

Degree Name

Master of Science

College

College of Agriculture and Life Sciences

Department

Department of Biochemistry, Molecular Biology, Entomology and Plant Pathology

Abstract

Experiments were conducted to refine and validate the soybean looper, Chrysodeixis includens (Walker) threshold in Mississippi soybeans, Glycine max. (L.) Merr. Equivalencies between sweep net and drop cloth sampling methods were evaluated, overall the sweep net was more effective at capturing soybean looper larvae greater than third instar and larvae less than or equal to third instar when compared to the drop cloth method. Feeding studies were conducted to determine the feeding rates of each instar, results showed that fifth instar larvae consume the greatest amount of leaf tissue, and larvae greater than or equal to third instar consume more leaf tissue than larvae less than third instar. Observed and expected/predicted defoliation rates were calculated. Observed defoliation was lower than predicted defoliation possibly due to field environmental conditions. Using data in combination with published data from other studies, three prediction models were created for the R3, R5, and R6 growth stage.

URI

https://hdl.handle.net/11668/16521

Sponsorship

Mississippi Soybean Promotion Board

Comments

Soybean||Soybean Looper||Threshold

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