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ARS Home » Southeast Area » Tifton, Georgia » Crop Protection and Management Research » Research » Publications at this Location » Publication #136045
Title: PHYTOTOXICITY OF DELAYED APPLICATIONS OF FLUMIOXAZIN ON PEANUT

Author
item Johnson, Wiley - Carroll
item PROSTKO, E - UNIVERSITY OF GEORGIA

Submitted to: American Peanut Research and Education Society Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: 4/27/2002
Publication Date: 7/8/2002
Citation: Johnson, W.C., Prostko, E.P. 2002. Phytotoxicity of delayed applications of flumioxazin on peanut [abstract]. American Peanut Research and Education Society Abstracts. 34:99-100.

Interpretive Summary:

Technical Abstract: Weed free trials were conducted in 2001 and 2002 at Attapulgus, GA to investigate the phytotoxicity of flumioxazin intentionally applied too late on 'C99R' peanut. The experimental design was a split with four replications. Main plots were times of flumioxazin application; 0, 2, 4, 6, 8, and 10 days after planting (DAP). Sub-plots were flumioxazin rates; nontreated, 0.071, and 0.105 kg ai/ha. Soil at the Attapulgus site was a Lucy loamy sand; 88% sand, 8% silt, 4% clay, and 0.4% organic matter. In addition, peanut were seeded shallow, 3.2 cm deep, creating worse-case conditions for phytotoxicity. Immediately after seeding, peanut were irrigated. Data collected were visual estimations of peanut injury (three ratings), canopy width (three measurements), final stand, and yield. Peanut seed were sprouting at 6 DAP, causing the soil surface to crack. Peanut seedlings were beginning to emerge, with the epicotyl visible at 8 DAP. Peanut were fully emerged with considerable foliage present 10 DAP. Flumioxazin applied to peanut 6, 8, and 10 DAP significantly injured peanut and reduced canopy width. Phytotoxicity was greater with flumioxazin at 0.105 kg/ha compared to 0.071 kg/ha. However, stand was not reduced by any of the applications or rates. Peanut growth recovered by mid-season. Peanut yields were not affected by either flumioxazin times of application or rate. These preliminary results show that the optimum time of application is from immediately after planting to three days after planting, but within that range the earlier applications are suggested. The highest recommended flumioxazin rate, 0.105 kg/ha, is not overly phytotoxic when applied within the recommended range of timings.