Response of Glufosinate-Resistant Rice (Oryza sativa) to Glufosinate Application Timings¹

Abstract

At 14 d after treatment (DAT), glufosinate-resistant CPRS PB-13 rice was injured with early- and late-season glufosinate applications in 1998 and 1999. At 35 DAT, injury was less than 5%. Glufosinate delayed CPRS PB-13 heading by 7 to 15 d and reduced plant height at harvest but did not affect grain moisture and yield compared with the nontreated CPRS PB-13. But yield was reduced compared with conventional Cypress. At 14 DAT, glufosinate-resistant BNGL HC-11/62 rice was injured with early- and late-season applications. Treated BNGL HC-11/62 reached 50% heading 3 to 5 d later than did the nontreated. An application of glufosinate reduced plant height and increased grain moisture compared with the nontreated. Rice treated at the three- to five-leaf, preboot, and boot timings resulted in reduced yields compared with the nontreated BNGL HC-11/62.

Evaluation of the Potential Role of Glufosinate-Tolerant Rice in Integrated Pest Management Programs for Rice Water Weevil (Coleoptera: Curculionidae)

“…The majority of these differences have been agronomic traits. Lanclos et al (2003) reported that two transformed glufosinate-tolerant lines of rice (BNGL HC-11 and BNGL HC-62) were shorter and had lower grain moistures at harvest compared with their parent line when glufosinate was not applied. An additional transgenic rice line, CPRS PB-13, was taller and produced lower yields than its parent line in the absence of glufosinate application.…”

“…Few experiments that include a nontreated transgenic control have examined the effects of herbicide-tolerant transgenic varieties on insects, although this type of evaluation of agronomic characteristics of transgenic varieties is required by governmental agencies. Such studies have shown that glufosinate applications to BNGL HC-11, BNGL HC-62, and CPRS PB-13 at various timings produced shorter plants and increased number of days required to reach 50% panicle emergence relative to their respective nontreated controls (Lanclos et al 2003). Herbicide applications to transformed (sulfonylurea-tolerant) tobacco lines increased sucker growth by 1.7Ð 8.5 times, depending on the line, herbicide, and herbicide rate (Brandle and Miki 1993).…”

“…Herbicide-induced changes include increased nitrogen content and altered wax composition, changes that result in improved growth rates and reduced feeding of herbivores, respectively (Ishii andHirano 1963, Eigenbrode andShelton 1992). Although herbicide applications are not lethal to herbicide-tolerant varieties, injury can still occur (Lanclos et al 2003). Depending on the severity of injury, the nutritive quality of treated plant tissues for insects may be altered (Campbell 1988).…”

Quizalofop-p-ethyl Mixed with Synthetic Auxin and ACCase-Inhibiting Herbicides for Weed Management in Rice Production

“…Weeds present a constant problem in rice (Oryza sativa L.) production and can reduce rice yield with early season competition [1,2]. e lack of weed control can reduce rice yield over 90%; therefore, effective weed management programs are essential for maximizing rice production [2,3].…”

Effect of Weed Interference Duration and Weed-Free Period on Glufosinate-Resistant Rice (Oryza sativa)1

“…Glufosinate has been evaluated for weed control in glufosinate-resistant rice for years (Braverman and Linscombe 1994;Lanclos et al 2002;Sankula et al 1997aSankula et al , 1997bWheeler et al 2000). Postemergence application of glufosinate provides effective control of most weeds, including red rice (Oryza sativa L.), which may not be controlled in conventional rice production systems, with little injury to glufosinate-resistant rice (Lanclos et al 2003).…”