Sethoxydim and Crop Oil Concentrate Increase Pyridate Phytotoxicity in Transplanted Cabbage (<i>Brassica oleracea</i>)

Bellinder, Robin R.; Kirkwyland, Jonathan J.; Wallace, Russell W.; Arsenovic, M.

doi:10.1017/s0890037x00041385

Cited by 2 publications

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“…Herbst and Derr (1990), Bullen et al (1993), andAl-Khatib et al (1995) all noted that post-emergence application of pyridate caused chlorotic spotting in brassica vegetables. However, overseas studies suggest damage at up to 1.0 kg/ha of pyridate to cabbage was transient, and did not affect final yields (Bullen et al 1993;Bellinder et al 1997). In our investigations, broccoli and Chinese cabbage sprayed with 900 g pyridate/ha yielded less than the best treatments in our experiments.…”

Section: Discussionmentioning

confidence: 99%

“…Our results show broccoli and Chinese cabbage to be more sensitive to pyridate than cabbage or cauliflower, which may be related to the timing of spraying in relation to crop development stage. Bellinder et al (1997) discussed the need to investigate the interactions between time of pyridate application and leaf cuticle development in cabbage plants, as a means of reducing the risk of crop phytotoxicity.…”

Section: Discussionmentioning

confidence: 99%

“…Pyridate is widely used at rates of 0.9-1.0 kg pyridate/ha in many parts of the world for weed management in brassica vegetables, particularly cabbages, although phytotoxicity is occasionally reported at such concentrations (Bullen et al 1993;Bellinder et al 1997). Pyridate is a phenyl-pyridazine herbicide (Australian Resistance Group C -inhibitor of photosynthesis at Photosystem II), with a different mode of action to clopyralid and picloram.…”

Section: Introductionmentioning

confidence: 99%

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Post emergence spraying of clopyralid, picloram or pyridate in broccoli, Chinese cabbage, cabbage, or cauliflower kills weeds, with minimal crop damage

Henderson¹,

Cairns²

2002

Aust. J. Exp. Agric.

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We investigated potential post-emergence herbicides for managing broadleaf weeds in broccoli, Chinese cabbage, cabbage, and cauliflower, as no products are currently registered for these uses in Australia. Subsequent to spraying clopyralid, picloram, or pyridate 5�weeks after direct-sowing broccoli or Chinese cabbage, or transplanting cabbage or cauliflower seedlings, we recorded crop phytotoxicity symptoms, measured marketable crop yields, and assessed weed control achieved. Neither maximum application rates of 90 g clopyralid/ha, nor 45�g clopyralid/ha mixed with 30 g picloram/ha, adversely affected vegetable yields. Spraying 60 g/ha clopyralid controlled burr medic (Medicago polymorpha), and suppressed common sowthistle (Sonchus oleraceus). Applying 90 g clopyralid/ha, or mixing 22.5 g clopyralid/ha with 15 g picloram/ha, controlled both burr medic and common sowthistle. At the rates tested, neither clopyralid nor picloram affected deadnettle (Lamium amplexicaule). Applying 450 g pyridate/ha caused chlorotic spotting of the sprayed vegetable leaves, but did not affect marketable yields of broccoli, cabbage or cauliflower. This rate controlled deadnettle, reduced sowthistle growth by only 30–50% compared with an unweeded control, and had no impact on burr medic. Spraying 900 g pyridate/ha increased the severity and persistence of chlorotic spotting, and resulted in lower broccoli and Chinese cabbage yields than obtained in the best treatments in the respective experiments. Cabbage and cauliflower yields were unaffected by spraying 900 g pyridate/ha. This rate improved sowthistle control to a commercially acceptable level. Our studies suggest that both clopyralid and pyridate could be successfully utilised in Australian vegetable brassica production, providing issues of the residual activity of clopyralid on following crops, and optimal application rates and timing for pyridate, were resolved.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Post emergence spraying of clopyralid, picloram or pyridate in broccoli, Chinese cabbage, cabbage, or cauliflower kills weeds, with minimal crop damage

Henderson¹,

Cairns²

2002

Aust. J. Exp. Agric.

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Cabbage (Brassica oleraceaL.) Response to Sulfentrazone for Broadleaf Weed Control

Smart

Brandenberger

Makus

2001

Journal of Vegetable Crop Production

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Cabbage (Brnssicaolermm L.) has few herbicides registcred for postemergencc weed control. A relatively new herhicidc which has selcctivc postemergence potential for use in cabbage is sulfentrazone. Sull'cntrazone was applied postcmergence to 2-4 leaf stage cabbagc at 23,46,93, 140, and 187 g active ingredient (a.i.) ha-'. Rates o f 23,46, and 93 g a.i. ha-' were also applied as a split application. The initial application occurrcd at the 2-4 leaf stage of growth and the second, at ' thc 6-8 leaf growth stage. Crop injury and leal'discoloration were minimal at 3 days after treatment (DAT). However, injury was substantial at 28 DAT with thc 93, 140, and 187 g a.i. ha-l rate, and with all the split applications in both years o f the study. Palmer amamnth (Atnorutzrhus prrltneri) and yellowtop (Verbitisitia eticeluloides) were cffcctively controlled with all sulfentrazone dosagc levels when applied postemergence to cabbage, excepl at thc lowest rate of23 g a.i. ha-'. Leaf yellowing and crop st~~nting occurred with the higher rates of sull'entrazone (140 and 187 g a.i. ha-') as well as with somc of the split applications. The cabbage head (corc growing point length) was reduced with 187 g a.i. ha-l sulfcntrazone only in 1999. Height ofcahbage hcads, circumference, and head wcight were reduced by 187 g a.i. ha-' i n 1999. When sull'entrazone was applied postemergcnce to cabbage at dosage levels o f 2 3 to 93 g a.i. ha-' crop injury, stunting, yellowing, or cabbage size or weight were not advcrscly impacted. Dosages o f 46 and 93 g a.i. ha-I of sulfen~razone effectively controlled yellowtop and Palmer amaranth which currently arc not effectively controlled by any othcr rcgis~ered J. R. Srnart and D. Makus are al'liliarcd with the United Slalcs Department of Agriculture, Agricultural Rescarch Service, 2413 Edst Highway, 83 Weslaco, TX 78596. L. Brandenberger i s al'liliatctl with Texas Agriculu~ral Extension Service, Wcslaco, TX 78596. herbicide. At dosagcs of46 and 93 g a.i. ha-' sulfentrazoneeffectively controlled weeds and had no adverse effect on cahhage size or quality. [Ar-ticle col~ies a~~nilrrble ,for cr fee fio111 Tlre I-lrrwortli Docrrmerrt deliver^ Service: 1-800-342-9675. E-nmil crdrlress: Website:

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Sethoxydim and Crop Oil Concentrate Increase Pyridate Phytotoxicity in Transplanted Cabbage (Brassica oleracea)

Cited by 2 publications

References 1 publication

Post emergence spraying of clopyralid, picloram or pyridate in broccoli, Chinese cabbage, cabbage, or cauliflower kills weeds, with minimal crop damage

Post emergence spraying of clopyralid, picloram or pyridate in broccoli, Chinese cabbage, cabbage, or cauliflower kills weeds, with minimal crop damage

Cabbage (Brassica oleraceaL.) Response to Sulfentrazone for Broadleaf Weed Control

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