Proceedings of the Sixty-first Annual Meeting of the Northeastern ...
Proceedings of the Sixty-first Annual Meeting of the Northeastern ... Proceedings of the Sixty-first Annual Meeting of the Northeastern ...
54 TOLERANCES OF ORNAMENTAL SHRUBS TO HALOSULFURON, SULFENTRAZONE AND V-10142. T.L. Mervosh and J.F. Ahrens, Connecticut Agricultural Experiment Station, Windsor. ABSTRACT We conducted research as part of the IR-4 Ornamental Horticulture Program to evaluate herbicide tolerances of four woody ornamental plants. The shrubs were planted in 1-gallon containers (6-in diameter) on May 1, 2006. Plants were ‘Emerald Green’ arborvitae (Thuja occidentalis ‘Smargd’), ‘P.J.M.’ rhododendron (Rhododendron ‘P.J.M.’), bridal-wreath spiraea (Spiraea x bumalda ‘Goldflame’) and dwarf burning-bush (Euonymus alatus ‘Compactus’). Each plot contained three plants of each species. Treatments, including an untreated check, were replicated four times in a randomized complete block design. Herbicide treatments were applied over the top of plants at normal (1X), twice normal (2X) and four times normal (4X) dosages on May 4 and again on July 7, 2006. Treatments consisted of sulfentrazone 0.2G (0.125, 0.25 and 0.5 lb ai/A), sulfentrazone 4F (0.125, 0.25 and 0.5 lb ai/A) and V-10142 75WG (0.5, 1.0 and 2.0 lb ai/A). Halosulfuron 75DF treatments (0.047, 0.094 and 0.188 lb ai/A) were applied over Spiraea spp. only. Herbicide sprays were applied in a volume of 30 gal/A using a CO 2 -pressurized sprayer with two 8003VS nozzle tips. Treatments were sprayed over the top of prewetted plants. Ten minutes later, plants were watered by overhead irrigation for 20 min. After foliage had dried, granular treatments were applied. Sulfentrazone 0.2G granules (amount per 10 ft 2 ) and sieved sand of like size were mixed in a shaker jar and applied uniformly over a plot of plants within a 10-ft 2 frame. Irrigation followed for 20 min. Evaluations of plant injury (0 = no injury; 10 = dead) or plant vigor (10 = most vigorous; 0 = dead) were recorded several times after each treatment application. Halosulfuron at all doses caused severe stunting and chlorosis of Spiraea spp. Some recovery occurred late in the season for Spiraea treated with the 1X dose of halosulfuron, but plant vigor (< 7.3) was still not acceptable. The first application of sulfentrazone 0.2G treatments injured Spiraea only (injury ratings of 1.2 to 2.7). However, Spiraea vigor was excellent at 9 weeks after the first treatment (9 WAT-1), and injury was insignificant following the second application of sulfentrazone 0.2G. The first application of sulfentrazone 4F treatments caused initial injury to Spiraea (2.5 to 5.5), rhododendron (1.3 to 2.0) and burning-bush (0.8 to 2.8). By 9 WAT-1, plant vigor was excellent (>9) except for Spiraea treated with sulfentrazone 4F at 2X and 4X doses (vigor of 8.9 and 7.3, respectively). Spiraea was the only species injured by the second application of sulfentrazone 4F. At 4 WAT-1 following V-10142 treatments, severe injury occurred on Spiraea (7.6 to 8.3) and burning-bush (5.1 to 7.6), and lesser injury on Arborvitae spp. (1.3 to 3.3) and Rhododendron (0.7 to 2.3). The second application of V-10142 caused additional injury to all plants. By the final evaluation on October 4 (12 WAT-2), plant vigor ratings were lowest for Spiraea (1.3 to 0.2) and highest for arborvitae (9.6 to 6.9). No weeds were present in containers on the herbicide application dates. Herbicidal efficacy of halosulfuron was not evaluated. Neither sulfentrazone nor V- 10142 treatments were effective at preventing horseweed (Conyza canadensis). Sulfentrazone treatments did not prevent smallflowered bittercress (Cardamine parviflora) or northern willowherb (Epilobium ciliatum). 36
55 UPDATE ON 2006 WEED SCIENCE RESEARCH IN THE IR-4 ORNAMENTAL HORTICULTURE PROGRAM. C.L. Palmer and J. Baron, IR-4 Project, Rutgers Univ., Princeton, NJ. ABSTRACT The 2006 IR-4 Ornamental Horticulture Research Program sponsored crop safety testing on four different products (SedgeHammer, Sulfentrazone 0.2G, Sulfentrazone 4F, and V-10142) for over-the-top applications on various ornamental species. The program also sponsored research for applications of SureGuard on select ornamental species prior to breaking dormancy. Thirty-six different species were tested with SedgeHammer; preliminary results indicate 19 of these exhibited some level of negative impact with over-the-top applications. Sulfentrazone 0.2G was applied to 41 ornamental species with 7 exhibiting some phytotoxicity. Sulfentrazone 4F was compared with Sulfentrazone 0.2G on 30 species with 11 crops showing phytotoxicity in preliminary results. Forty-four species were examined for injury with over-the-top applications of V-10142; 25 exhibited phytotoxicity. SureGuard was applied as a dormant over-the-top application to 19 ornamental species and was injurious on seven. The results from this research will aid in the development of the labels for these products and will help growers and landscape care professionals make more informed product choices. 37
- Page 3 and 4: 3 NORTHEASTERN WEED SCIENCE SOCIETY
- Page 5 and 6: 5 SECTION CHAIRS Agronomy Chair: J.
- Page 7 and 8: 7 CARFENTRAZONE AND QUINCLORAC FOR
- Page 9 and 10: 9 THE EFFICACY AND CROP TOLERANCE O
- Page 11 and 12: 11 EVALUATION OF HERBICIDES FOR CON
- Page 13 and 14: 13 BEING HEARD BY THE IR-4 PROJECT.
- Page 15 and 16: 15 ABSTRACTS FROM THE 7 TH CONFEREN
- Page 17: 17 HERBICIDE NAMES: COMMON, TRADE,
- Page 20 and 21: 20 INTEGRATING WEED CONTROL STRATEG
- Page 22 and 23: 22 GIANT HOGWEED ERADICATION IN PEN
- Page 24 and 25: 24 EFFECTS OF EMERGENCE PERIODICITY
- Page 26 and 27: 26 PRODUCER AND PRODUCTION IMPACTS
- Page 28 and 29: 28 A SIMPLE METHOD FOR CLEANING TUF
- Page 30 and 31: 30 EMERGENCE AND PERFORMANCE OF TWO
- Page 32 and 33: 32 CARFENTRAZONE AND QUINCLORAC FOR
- Page 34 and 35: 34 2006 NEWSS SUMMER WEED CONTEST R
- Page 36 and 37: 36 INVASIVE AQUATIC WEEDS IN NORTH
- Page 38 and 39: 38 AMMONIUM PELARGONATE AS A BIOHER
- Page 40 and 41: 40 TRINEXAPAC-ETHYL INFLUENCES EFFI
- Page 42 and 43: 42 Table 1. Insect feeding damage,
- Page 44 and 45: 44 WEED CONTROL WITH TOPRAMEZONE PR
- Page 46 and 47: 46 ROTARY HOE EFFICACY IN CORN: INF
- Page 48 and 49: 48 ALFALFA/GRASS FORAGE MIXTURES US
- Page 50 and 51: 50 CONTROL OF NEW WEED SPECIES IN T
- Page 52 and 53: 52 Table 1. Results of 2006 contain
- Page 56 and 57: 56 2006 WEED MANAGEMENT TRIALS IN C
- Page 58 and 59: 58 THE RESPONSE OF FIELD AND CONTAI
- Page 60 and 61: 60 THE EFFICACY AND CROP TOLERANCE
- Page 62 and 63: 62 Table 2. Plant quality ratings o
- Page 64 and 65: 64 EVALUATION OF PROLINE-LINKED PEN
- Page 66 and 67: 66 ANNUAL BLUEGRASS AND DOLLAR SPOT
- Page 68 and 69: 68 Table 1. Autumn 2005 versus spri
- Page 70 and 71: 70 A PRELIMINARY STUDY OF THE NON-N
- Page 72 and 73: 72 native species, covering and smo
- Page 74 and 75: 74 EFFECTS OF BUCKWHEAT RESIDUE ON
- Page 76 and 77: 76 Japanese knotweed control 28 DAT
- Page 78 and 79: 78 ENHANCED TOLERANCE TO WEED COMPE
- Page 80 and 81: 80 EFFECTS OF PLANTING AND TERMINAT
- Page 82 and 83: 82 A UNIFYING FRAMEWORK FOR SPECIES
- Page 84 and 85: 84 BIOLOGY OF MULTIFLORA ROSE: AN I
- Page 86 and 87: 86 AN OUNCE OF PREVENTION. M.J. Van
- Page 88 and 89: 88 HERBICIDE COMPARISON IN WET BLAD
- Page 90 and 91: 90 Table 1. Morrow's honeysuckle (L
- Page 92 and 93: 92 EVALUATION OF HERBICIDES FOR CON
- Page 94 and 95: 94 EVALUATION OF HERBICIDES FOR CON
- Page 96 and 97: 96 HOT WATER SYSTEMS FOR VEGETATION
- Page 98 and 99: 98 SEEDHEAD SUPPRESSION OF ANNUAL B
- Page 100 and 101: 100 ROUGHSTALK BLUEGRASS CONTROL WI
- Page 102 and 103: 102 EFFECT OF DEW AND GRANULAR FORM
55<br />
UPDATE ON 2006 WEED SCIENCE RESEARCH IN THE IR-4 ORNAMENTAL<br />
HORTICULTURE PROGRAM. C.L. Palmer and J. Baron, IR-4 Project, Rutgers Univ.,<br />
Princeton, NJ.<br />
ABSTRACT<br />
The 2006 IR-4 Ornamental Horticulture Research Program sponsored crop<br />
safety testing on four different products (SedgeHammer, Sulfentrazone 0.2G,<br />
Sulfentrazone 4F, and V-10142) for over-<strong>the</strong>-top applications on various ornamental<br />
species. The program also sponsored research for applications <strong>of</strong> SureGuard on select<br />
ornamental species prior to breaking dormancy. Thirty-six different species were tested<br />
with SedgeHammer; preliminary results indicate 19 <strong>of</strong> <strong>the</strong>se exhibited some level <strong>of</strong><br />
negative impact with over-<strong>the</strong>-top applications. Sulfentrazone 0.2G was applied to 41<br />
ornamental species with 7 exhibiting some phytotoxicity. Sulfentrazone 4F was<br />
compared with Sulfentrazone 0.2G on 30 species with 11 crops showing phytotoxicity in<br />
preliminary results. Forty-four species were examined for injury with over-<strong>the</strong>-top<br />
applications <strong>of</strong> V-10142; 25 exhibited phytotoxicity. SureGuard was applied as a<br />
dormant over-<strong>the</strong>-top application to 19 ornamental species and was injurious on seven.<br />
The results from this research will aid in <strong>the</strong> development <strong>of</strong> <strong>the</strong> labels for <strong>the</strong>se<br />
products and will help growers and landscape care pr<strong>of</strong>essionals make more informed<br />
product choices.<br />
37
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