Compatibility of herbicide-insecticide-fungicide combinations and their phytotoxicity on soybean
Author(s): Abhishek Kumar Tamta and RP Srivastava
Abstract: This study evaluated the physical and chemical compatibility of two insecticides (emamectin benzoate and flubendiamide), two herbicides (quizalofop-ethyl and imazamox + imazethapyr), and one fungicide (fluxapyroxad + pyraclostrobin), as well as their combinations, at 25 °C using tap water. Solutions were observed for pH, TDS, EC, solubility, colour, cream volume, and sediment volume over 24 hours. Results showed all individual formulations, except imazamox + imazethapyr, were cloudy but soluble without precipitation. Combination solutions exhibited turbidity but remained soluble. The pH of combinations of emamectin benzoate and flubendiamide with quizalofop-ethyl + fluxapyroxad + pyraclostrobin or imazamox + imazethapyr + fluxapyroxad + pyraclostrobin exhibited pH decreases by 8.0-7.58, 7.87-7.37, 7.73-7.17, and 7.41-7.37, respectively, over 24 h. The tap water pH ranged between 6.90-6.54. The total dissolved solids remained below 500 mg/L. Phytotoxicity tests on soybean PS-1347 revealed no adverse effects at recommended and double doses. The study concluded that the tested pesticide combinations are stable and non-phytotoxic, making them suitable for field application within 24 hours of preparation.
