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Giant Ragweed (Ambrosia Trifida L.) Biology, Competition, And Control In Cotton (Gossypium Hirsutum L.), Kelly Anna Barnett

Doctoral Dissertations

The objectives of this research were to evaluate control options and investigate the biology and competitiveness of glyphosate-resistant (GR) giant ragweed in cotton. Our results determined that glufosinate followed by glufosinate, glufosinate plus pyrithiobac, and glufosinate plus fluometuron at 0.56 or 1.12 kg ai ha^-1 resulted in the highest level of visual control and the highest yield. However, glufosinate followed by glufosinate was the only treatment that resulted in the highest yield and > 90% control of GR giant ragweed.

The development of glufosinate-tolerant, 2,4-D tolerant, and dicamba-tolerant crops may provide growers with new opportunities for difficult-to-control weeds such as …

Efficacy Of Biopesticides For Organic Management Of Cucumber Beetles, Mary A. Rogers

Doctoral Dissertations

Organic growers are limited in crop protection techniques for cucumber beetle management. Spotted (Diabrotica undecimpunctata howardi) and striped (Acalymma vitatta) cucumber beetles and are significant pests of cucurbits in the U.S. Feeding results in aesthetic damage and reduction in marketable yields as well as transmission of bacterial wilt that can result in plant mortality. Biopesticides are products formulated from naturally occurring organisms such as fungi and bacteria that are pathogenic or toxic to insect pests. Advantages to these products are that they have low environmental risk, low risk to non-target organisms including mammals and beneficial insects, …

Measuring Single Nucleotide Polymorphism In The Vegetable Pathogen Phytophthora Capsici, Daniel Jara Gobena

Doctoral Dissertations

Phytophthora capsici is a eukaryotic plant pathogen that causes root, fruit, and foliar disease on a variety of important vegetables including pepper, tomato, eggplant, snap and lima beans, and essentially all cucurbits. At some locations, populations utilize sexual and asexual reproduction, whereas at others, populations appear to be entirely asexual. The differing population structure has important implications for developing control strategies. Our objective was to develop SNP markers to characterize natural populations and laboratory crosses. In chapter two, a novel technique to assay SNP genotypes based on high-resolution DNA melting analysis is presented. In chapter three, the genetic diversity for …