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Characterization of Clomazone Resist...

Driver, Katie Elizabeth.

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Characterization of Clomazone Resistance and Control in Leptochloa fusca spp. fasicularis Populations from California Rice Fields.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Characterization of Clomazone Resistance and Control in Leptochloa fusca spp. fasicularis Populations from California Rice Fields./
作者:	Driver, Katie Elizabeth.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2019,
面頁冊數:	93 p.
附註:	Source: Dissertations Abstracts International, Volume: 81-06, Section: B.
Contained By:	Dissertations Abstracts International81-06B.
標題:	Agronomy. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=13897300
ISBN:	9781392639085

Characterization of Clomazone Resistance and Control in Leptochloa fusca spp. fasicularis Populations from California Rice Fields.
Driver, Katie Elizabeth.

Characterization of Clomazone Resistance and Control in Leptochloa fusca spp. fasicularis Populations from California Rice Fields. - Ann Arbor : ProQuest Dissertations & Theses, 2019 - 93 p.

Source: Dissertations Abstracts International, Volume: 81-06, Section: B.

Thesis (Ph.D.)--University of California, Davis, 2019.

This item must not be sold to any third party vendors.

Bearded sprangletop (Leptochloa fusca spp. fasicularis) is a troublesome weedy species in California rice fields. Its control is chiefly dependent on the water-seeded, continuously flooded rice system and herbicides. As a result of the continuous monocrop system of rice, herbicide-resistant populations of bearded sprangletop have been selected in California rice fields. Recently, poor control with clomazone has been reported by many California rice growers. In addition, anecdotal evidence from California rice growers suggest bearded sprangletop may have adapted to the flooding pressures used in the cropping system for weed control. We hypothesized that the low clomazone efficacy observed in California populations is due to the selection of a clomazone-resistant biotype and that this resistance is the results of a non-target mechanism of resistance. We also hypothesized that bearded sprangletop populations have adapted to the standard flood used in California rice fields. Greenhouse, field and laboratory experiments were conducted to characterize putative herbicide-resistant bearded sprangletop populations from California. Greenhouse survey and dose-response experiments confirmed the presence of clomazone resistance in four bearded sprangletop populations from California. Laboratory experiments with the clomazone-resistant biotypes of bearded sprangletop indicate that metabolism of clomazone is involved in the resistance mechanism. Resistance to clomazone in these biotypes is due the oxidation of the parent molecule to less toxic metabolites within the plant. Field experiments across the Sacramento Valley indicated that failures of clomazone in the rice growing region are likely due to the later emergence of bearded sprangletop and that clomazone application are made too early in the season for effective control. These field experiments also indicated that bearded sprangletop has adapted to flooding pressures and the standard 10 cm flood is not adequate to suppress or control the weed. These results add generally to the body of knowledge of herbicide resistance in bearded sprangletop and can provide important information to growers and pest control advisors managing bearded sprangletop in California rice.

ISBN: 9781392639085Subjects--Topical Terms:

2122783
Agronomy.
Subjects--Index Terms:

herbicide-resistance

Characterization of Clomazone Resistance and Control in Leptochloa fusca spp. fasicularis Populations from California Rice Fields.
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