Soil persistence and cotton (Gossypium hirsutum L.) response to CGA-362622 /
The new sulfonylurea herbicide CGA-362622 with the proposed common name of trifloxysulfuron sodium is under development by Syngenta Crop Protection. Studies were conducted to: 1) investigate potential cotton phytotoxicity with CGA-362622 tank-mixed with selected cotton insecticides; 2) determine ab...
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| Format: | Thesis Book |
| Language: | English |
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[Place of publication not identified] :
[publisher not identified] ;
2002.
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| Subjects: | |
| Online Access: | http://proxy.library.tamu.edu/login?url=http://proquest.umi.com/pqdweb?did=726458551&sid=1&Fmt=2&clientId=2945&RQT=309&VName=PQD |
| Summary: | The new sulfonylurea herbicide CGA-362622 with the proposed common name of trifloxysulfuron sodium is under development by Syngenta Crop Protection. Studies were conducted to: 1) investigate potential cotton phytotoxicity with CGA-362622 tank-mixed with selected cotton insecticides; 2) determine absorption and translocation of ¹⁴C-labeled CGA-362622 applied alone and in combination with malathion; 3) determine response of four cotton varieties to CGA-362622; 4) evaluate potential carryover of CGA-362622 to corn, grain sorghum, rice, and soybeans; and 5) determine greenhouse bioassay results on corn and sunflower with soil collected from field studies. Research was conducted to evaluate CGA-362622 applied post over-the-top of cotton alone and in tank-mixture with several insecticides including acephate, dicrotophos, azinphos methyl, oxamyl, thiamethoxam, dimethoate, and malathion. CGA-362622 tank-mixed with malathion resulted in greater cotton phytotoxicity than either applied alone and yield was reduced in one of four locations. Pyrithiobac tank-mixed with malathion resulted in similar levels of cotton phytotoxicity. The other insecticides tank-mixed with CGA-362622 generally did not adversely affect cotton. Greater absorption of radiolabeled CGA-362622 occurred in treated leaves 4 h after application of CGA-362622 tank-mixed with malathion compared to CGA-362622 applied alone to 3-to 4-leaf cotton. Translocation of CGA-362622 to plant tissue above and below the treated leaf was greater with the tank-mixture. Field studies indicated there was not a significant difference in the response of cotton varieties Delta Pine and Land 50, Stoneville 474, Paymaster 1220 and Paymaster 1220 RR to CGA-362622 at 1, 2, and 4X of the proposed over-the-top rate. Cotton recovered from the 1 and 2X rates by 14 days after treatment (DAT), but the 4X rate resulted in a height reduction. Corn and grain sorghum responded similarly to CGA-362622 residues in soil persistence experiments and were more sensitive than rice and soybeans. All crops exhibited significant phytotoxicity to CGA-362622 at 60 g/ha when planted 90 DAT. Greater soil persistence was observed 90 DAT at the location with a pH of 7.2 compared to the other location with a pH of 6.8. However, no injury was observed at either location to any crop planted 209 to 312 DAT. |
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| Item Description: | Vita. "Major Subject: Agronomy". |
| Physical Description: | x, 88 leaves ; 28 cm. Issued also on microfiche from University Microfilm Inc. |
| Bibliography: | Includes bibliographical references (leaves 66-73). |