preemergence (PRE) herbicides for summer annual weed control can compromise establishment of overseeded cool-season turfgrass species in the fall. Yelverton and McCarty (2001) reported that prodiamine reduced perennial ryegrass establishment when applied at
expensive and technically challenging practice for organic grape production ( Dufour, 2006 ; Guthman, 2000 ), and many organic farmers rely on mechanical and hand cultivation for weed control. Although these methods are highly effective, they are also labor
). In addition to the mulches, we included two treatments without mulch, no mulch + no weed control and no mulch + weed control, to separate the effect of weed control from the overall mulch effect. Specific objectives of the project were to determine
). Chemical weed control is essential to obtain the highest possible pumpkin yields in NT production systems, and tank mixtures of various herbicides are generally necessary to maximize weed control ( Brown and Masiunas, 2002 ; Kammler et al., 2008
Postemergence and preemergence herbicides were evaluated for crop phytotoxicity and weed control in seepage-irrigated ‘Bristol Fairy’ gypsophila (Gypsophila paniculata L.). DCPA, napropamide, pronamide, and oryzalin were severely injurious to gypsophila. Metolachlor, oxyfluorfen, alachlor, and oxadiazon provided varying degrees of weed control and did not reduce plant vigor or yield. Best weed control was provided by two applications of 4.48 kg·ha-1 oxadiazon. Chemical names used: dimethyl tetrachloroterephthalate (DCPA); 2-(napthoxy)-N, N-diethylpropionamide (napropamide); 3,5-dichloro(N-1,1-dimethyl-2-propynyl)benzamide (pronamide); 4-(dipropylamino)-3,5-dinitrobenzenesulfonamide (oryzalin); 2-chloro-N-(2-ethyl-6-methylphenyl)-N-(2-methoxy-1-methylethyl)acetamide (metolachlor); 2-chloro-1-(3-ethoxy-4-nitrophenoxy)-4-(trifluoromethyl)benzene (oxyfluorfen); 2-chloro-N-(2,6-diethylphenyl)-N-(methoxymethyl)acetamide (alachlor); 3-[2,4-dichloro-5-(1-methylethoxy)phenyl]-5-(1,1-dimethylethyl)-1,3,4-oxadiazol-2(3H)-one (oxadiazon).
Eight herbicides were evaluated for phytotoxicity to field grown ‘Candidium’ caladiums (Caladium × hortulanum Birdsey) in 1983. The 4 most promising or currently used herbicides were evaluated for weed control and phytotoxicity in 1984. During 1984, 4 applications of 2.24 kg/ha alachlor, 2.24 kg/ha simazine, 1.68 kg/ha oryzalin, and 0.56 kg/ha oxyfluorfen, all in combination with 1 postemergence application of 0.28 kg/ha fluazifop-butyl, were applied to caladiums. Alachlor and oxyfluorfen provided poor weed control and reduced plant vigor, tuber weights, and tuber size in 1984. Simazine provided good weed control, but reduced plant vigor and yield. Oryazlin provided excellent weed control without crop injury. Chemical names used: 2-chloro-N-(2,6-diethylphenyl)-N-(methoxymethyl)acetamide (alachlor); 6-chloro-N,N’-diethyl-1,3,5-triazine-2,4-diamine (simazine); 4-(dipropylamino)-3,5-dinitrobenzene sulfonamide (oryzalin); 2-chloro-l-(3-ethoxy-4-nitrophenoxy)-4-(trifluoromethyl)benzene (oxyfluorfen); butyl-2-[4-[[5-(trifluoromethyl)-2-pyridinyl]oxy] phenoxy] propanoate (fluazifop-butyl).
management in citrus groves greatly varies depending on the type of crop, producer, location, and availability of resources. Citrus growers use a combination of mechanical, chemical, and cultural methods to control weeds. Among various methods of weed control
Preemergence herbicides for weed control in field-grown statice [Limonium sinuatum (L.) Mill.], applied pretransplant, with a second posttransplant application over the top of the crop before flowering, were evaluated. DCPA, oxadiazon, and oxyfluorfen generally provided safe, efficacious weed control in the first experiment (1984) and were further evaluated in the second experiment (1985), wherein crop vigor and yield were not reduced. Control of most weeds was good with DCPA, oxadiazon, and oxyfluorfen; however, crabgrass [Digitaria sanguinalis (L.) Scop.] control with oxyfluorfen was inconsistent in both experiments and decreased late in the season. Chemical names used: dimethyl 2,3,5,6-tetrachloro-1,4-benzene-dicarboxylate (DCPA); 3-[2,4-dichloro-5-(1-methylethoxy)phenyl]-5-(1,1-dimethylethyl)-1,3,4-oxadiazol-2-(3H)-one (oxadiazon); 2-chloro-1-(3-ethoxy-4-nitrophenoxy)-4-(trifluoromethyl) benzene (oxyfluorfen).
Producers growing squash for markets who desire the use of more naturally occurring herbicides need alternatives that effectively provide season-long weed control. Although corn gluten meal has shown promise as an early-season preemergent herbicide
the use of more naturally occurring herbicides need alternatives that effectively provide season-long weed control. Although corn gluten meal has shown promise as an early season preemergent herbicide in vegetable production, any uncontrolled weeds can