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| Publication Type:
| Report |
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| Content Type: | Abstract or Summary only |
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| Author(s): | Neal, Joseph C.;
Senesac, Andrew F. |
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| Author Affiliation: | Neal: Assistant Professor, Department of Floriculture and Ornamental Horticulture, Cornell University, Ithaca, NY; Senesac: Extension Weed Scientist, Suffolk Co. Coop. Extn., L. I. Horticultural Res. Lab., Riverhead, NY |
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| Title: | Factors influencing fenoxaprop efficacy |
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| Section: | Weed control
Other records with the "Weed control" Section
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| Source: | 1986 Cornell University Turfgrass Research Report. 1986, p. 53. |
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| Publishing Information: | [Ithaca], NY: Cornell University |
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| # of Pages: | 1 |
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| Abstract/Contents: | "The influences of plant growth stage, spray volume, additional surfactant, formulation and tank mixing with preemergent herbicides on fenoxaprop-ethyl activity were evaluated in a series of experiments. Tests were conducted in areas of drought stress and on irrigated turf. Turfgrass infested with smooth crabgrass (Digitaria ischaemum #DIGIS) was treated with fenoxaprop at three growth stages: 2 to 4 true leaves (EP), 1 to 3 tillers (MP) and 3 to 5 tillers (LP). In [the] 1985 experiments excellent control of crabgrass was achieved with EP applications and good control (>90%) was achieved with MP and LP treatments. However, in [the] 1986 experiments poor control was observed with EP and MP applications with fair control with LP treatments. The differences between years is attributed to severe drought stress in 1986. Spray volume and additional surfactant were evaluated under stressed and non-stressed conditions. Fenoxaprop was applied to tillered crabgrass at 15, 30, 60, and 120 gpa using flat fan nozzles. Flooding nozzles were compared at 120 gpa. All volume and nozzle treatments were applied with and without an additional 1/4% v/v nonionic surfactant. Control at 15 gpa was less than at other spray volumes. Control was also decreased when applications were made with a flooding nozzle as compared to flat fan nozzles. The addition of surfactant improved the weed control for flooding nozzle applications but not to a point comparable to flat fan nozzle applications. Under non-stressed conditions control was less at 15 gpa than at 30, 60 or 120 gpa. Flooding nozzle applications were equally effective as flat fan treatments when applied to non-stressed turf. The EC and EW formulations were compared in the spray volume experiment. No differences were observed between the two formulations. The major factor influencing fenoxaprop activity in 1986 was drought stress. Severe reductions in control were observed in experiments conducted in areas of drought as compared to previous experiments or to tests on irrigated turf. Tank mixing with preemergent herbicides improved early postemergent control of drought stressed crabgrass; with the pendimethalin tank mix providing better control than tank mixes with DCPA or bensulide." |
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| Language: | English |
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| References: | 0 |
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| Note: | This item is an abstract only! |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Neal, J. C., and A. F. Senesac. 1986. Factors influencing fenoxaprop efficacy. Cornell Turfgrass Ann. Rep. p. 53. |
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MSU catalog number: SB 433 .A1 C7 |
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