Multiple herbicide-resistant (MHR) Palmer amaranth poses a serious management concern for growers across the United States. Since 2014, several Palmer amaranth populations with suspected resistance to most commonly used herbicides were collected in random field surveys across Kansas. This study aimed to characterize the resistance levels to glyphosate (EPSPS inhibitor), mesotrione (HPPD inhibitor), chlorsulfuron (ALS inhibitor), and atrazine (PS II inhibitor) in three suspected MHR Palmer amaranth populations (KW2, PR8, and BT12) compared to a known herbicide-susceptible (SUS) population. Doseresponse studies revealed that PR8 and BT12 populations had 7-to 14-fold level resistance to glyphosate, and up to 12-fold level of resistance to chlorsulfuron (Glean herbicide) on the basis of visible control (LD 50 values) and shoot dry weight response (GR 50 values). The KW2, PR8, and BT12 populations also showed 2-to 4-fold resistance to mesotrione (Callisto herbicide) relative to SUS population. Based on plant dry weight response (GR 50 values), the KW2 and BT12 populations showed 5-and 16-fold resistance to atrazine (AAtrex XP), respectively, compared with the SUS population. These results confirm the first report on the evolution of a Palmer amaranth population (BT12) with multiple resistance to glyphosate (12 to 14 fold), chlorsulfuron (11 fold), mesotrione (2 to 4 fold), and atrazine (16 fold) in Kansas. Further studies are in progress to investigate the response of these MHR populations to fomesafen (PPO inhibitor); 2,4-D; and dicamba (synthetic auxins) herbicides.
The present investigation was conducted at Sardar Vallabhbhai Patel University of Agriculture & Technology, Meerut to find out the promising cultivars of pomegranate on the basis of biochemical perameters. The maximum level of TSS was measured in cv. Ganesh (14.71 0 brix) followed by cv. Arakta (13.84 0 brix) and cv. G-137 (12.71 0 brix). Out of the eight cultivars studied, significantly maximum level of total sugars was found in cv. Arakta (12.98 %) followed by cv. Mridula (12.36 %) and cv. Ganesh (12.33 %). The level of titrable acidity was found to be significantly lowest in cv. Jalore Seedless (0.30 %) followed by cv. Mridula (0.31). In the present study, maximum TSS:Acid ratio was observed in cv. Ganesh (45.96) followed by cv. G-137 (41.00) and cv. Jalore Seedless (40.73). Maximum Sugar:Acid ratio was found in cv. Mridula (39.87) closely followed by cvs. Jalore Seedless (39.40), Ganesh (38.53) and Arakta (38.17).
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