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Title: DELAYED FLOOD FOR RICE WATER WEEVIL CONTROL USING HERBICIDE RESISTANT GERM-PLASM

Author
item Rice, William
item RING, D - LOUISIANA ST UNIV
item CROUGHAN, T - LOUISISNA ST UNIV
item MEUGGE, M - LOUISIANA ST UNIV
item BRAVERMAN, M - LOUISIANA ST UNIV
item STOUT, M - LOUISIANA ST UNIV

Submitted to: Rice Technical Working Group Meeting Proceedings
Publication Type: Proceedings
Publication Acceptance Date: 12/1/1997
Publication Date: N/A
Citation: N/A

Interpretive Summary:

Technical Abstract: Cultural practices employing draining and reestablish of permanent flood have been used to alleviate damage caused by larvae of the rice water weevil, Lissorhoptrus oryzophilus (Kuschel). However, there are negative costs associated with this management regime such as loss of weed control and nitrogen, thus, necessitating the reapplication of herbicide, nitrogen and reestablishment of permanent flood. An alternative to drainage of rice basins for the control of RWW is to simply delay the establishment of the permanent flood. Delayed flood avoids problems associated with drainage and reflooding of the basins. The primary objective of this study is to evaluate efficacy of delayed flood for rice water weevil and weed control using a herbicide resistant rice line. Use of herbicide resistant lines enables the application of delayed flood for RWW control due to an increased spectrum of herbicidal activity against weeds. In a previous study (Rice et al., 1994), we provided evidence that delay of flood did no significantly reduce rice yields using the commercial cultivar Lemont. In this study we provide evidence that delay of flood significantly reduces and delays RWW larval populations, thus providing a potential alternative cultural practice for RWW control. Significant control of noxious weeds was also observed without additional herbicide inputs. We anticipate that the yield gain from control of the RWW without an insecticide application and with reduced (or altered) herbicide applications will be such that the potential yield loss from delayed flooding (due to possible physiological stress on the rice plant) will be offset.