The two herbicides currently registered for the control of canarygrass in Arizona work by inhibiting lipid biosynthesis. The levels of control with these herbicides have been variable, ranging from 60 to 90 percent. Crop safety has been good. Two newer herbicides utilizing a different mode of action have provided more consistent and higher levels of weed control but with increased crop injury. These are numbered compounds (MKH6561 and F130060) and they are ALS inhibitors.

This work is focused on verification of the effect of chosen herbicides on Weeds occuring in sprouts of spring barley which i sone of the main crops grown in the territory of the Czech Republic. Lately, herbicides have influenc the Šeld of spring barley. So as to verify the herbicide efficiency there was founded a small parcel o fland test where there was assessed the efficiency of postmergent herbicides on Leeds which occurred in all parcels and during all the observation. The efficiency was observed on four measurements and it was recorded in percentage by Subjective Estimation Methods. The chosen postmergent herbicides took a very good effect on singl Leeds. As the best effective herbicide could be, hawevr, indicated Sekator OD which operand on all the Leeds the same way as the Catalogue of Preparation for Plant Protection 2012 states. Out of the results of efficiencies and overalobservations of tested area it can be stated that despote good preventative measures the protection of spring barley can not dispense with higt quality treatment with verified herbicides.

No description available.

A field experiment was conducted in 1998 to determine the efficacy of Puma and Hoelon for littleseed canarygrass control in durum wheat. The herbicide treatments consisted of three rates of Puma, 0.83, 1.24, and 1.66 oz a.i./A, and one rate of Hoelon, 6.8 oz a.i./A, that were applied at two application timings. The early-postemergence (EPOST) applications when canarygrass had 2.2 leaves per plant did not result in commercially acceptable control due to water stress. Increasing rates of Puma applied mid-postemergence (MPOST) when canarygrass had 5 leaves per plant provided increasing canarygrass control (70 to 90 %) with the two higher rates of Puma providing commercially acceptable control. The two highest rates of Puma also resulted in better weed control than the commercial standard, Hoelon, which did not provide commercially acceptable weed control. No herbicide injury symptoms were observed on the wheat at any of the evaluation dates. Grain yield also increased as the rate of Puma applied MPOST increased and yields overall reflected the degree of weed control observed earlier in the season. These data indicate that the combination of Puma applications that killed or stunted emerged canarygrass combined with later season crop competition that suppressed stunted and later emerging canarygrass plants was sufficient to protect grain yields. The highest yielding Puma treatment was equivalent to 4150 lb/A compared to the Hoelon and control treatments which yielded the equivalent of 2753 and 1946 lb/A, respectively.