Herbicide cereal

Pyraflufen-ethyl was primarily developed as a cereal herbicide to control a broad spectrum of broadleaf weeds. Pyraflufen-ethyl applied in early postemergence at 12 g a.i. ha provides excellent control of some important weeds such as Anthemis arvensis, Lamium purpureum and Sinapis arvensis and good suppression of Matricaria chamomilla, Stel-iaria media, Veronica persica and Viola spp. 

General LC/MS Conditions for Sulfonylurea Multiresidue Analysis. We have developed general thermospray LC/MS conditions for the purpose of separating and detecting six different sulfonylurea herbicides. These conditions can be used as a guide fra- a variety of LC/MS residue applications which may require the analysis of one or more of these herbicides. Our procedure includes GLEAN (chlorsulfuron), ALLY (metsulfuron methyl), HARMONY (thiameturon) and EXPRESS cereal herbicides, CLASSIC (chlorimuron ethyl) soybean herbicide and OUST (sulfometuron-methyl) noncrop land herbicide. (Structure 1)... 

Ethyl 2-chloro-5-(4-chloro-5-difluoromethoxy-l-methylpyrazol-3-yl)-4-fluorophenoxy-acetate as a new cereal herbicide, Pyraflufen-ethyl 03YGK2. 

I.B. Bryan, M.J. Rice, M.R. Bartley, A.R. Jutsum and G. Pastushok, A Monic Acid Derivative Evaluation as a Cereal Herbicide in Brighton Crop Protection Conf. -Weeds, 1995, Vol. 2, pp. 725-730. 

The data concerning the use of PPPs are widely available. UK long-term trends in pesticide use showed that the weight of the applied active substances decreased for 19% from year 1986 to year 1996. These data also showed that a significant change in the type of active substances was observed. For example, organochlorine pesticide usage decreased because of the revocation or the restriction in use. Isoproturon, a cereal herbicide, showed an increase in its use of 22% from 1986 to 1996. 

In 2002, for the first time since 1999, the cereal herbicide isoproturon is not the most frequendy occurring pesticide. The noiu icultural herbicide diuron occurs most frequendy, with herbicide mecoprop second and isopromron third. Diuron is a persistent herbicide used on noncrop areas, particularly railways lines, recreational areas and other hard surfiice. Use of diuron as an antifoulant has been ceased in November 2002. Simazine shows an increasing level that can be explained as much targeted monitoring as by variation in agricultural practice. 

I 70 Discovery and SAR ofPinoxaden A New Broad Spectrum, Postemergence Cereal Herbicide... 

Du Pont started relatively late in the triketone field, and directed their efforts toward novel fused bicyclic acids. As a result of their work in this area, they discovered the broad leaf weed cereal herbicide ketospiridox [58] (62, proposed common name. Fig. 4.3.10). Ishihara, inspired by earlier work of Hokko [59], identified some new benzoyl analogues with cyclic acetal meta-substituents (63 and 64, Fig. 4.3.11) that they claim have good pre-emergent activity in flooded rice paddy fields without damaging the rice seedlings [60]. 

When 3 was treated with two equivalents of sodium cyanide in DMF and heated to 100°C for two hours the 5-cyano-pyrazole ester 9 was produced and converted to the corresponding carboxamide 11 (Figure 3). Compound 11 was active at 0.5 Ib/acre in the greenhouse, and this derivative was pursued as a preemergent cereal herbicide (, 2). ... 

Ideally, sugar beet will follow a cereal. This allows an opporturrity for strrbble cleaning but still allows time for careful October/November ploughing with subsequent essential weathering of the topsoil. Care must be taken to avoid certain cereal herbicides which can remain in the soil in sufficient quantities to affect the germination of the beet crop. 

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