Physical Compatibility and Stability of Pesticide Mixtures at Different Spray Volumes

Abstract

Available information on physical compatibility and stability of pesticide mixtures is scarce and often divergent. This knowledge is of fundamental importance in the success of pest, disease, and weed control programs. Compatibility and stability of two glyphosate formulations (WG and SL) in a mixture with fluazinam + deltamethrin + trifloxystrobin/cyproconazole at four diluted water concentrations and different times were evaluated under laboratory conditions. The evaluations were performed at the following time intervals: immediately after mixing and 1, 5, 10, 30, 120, 900, and 1,440 minutes after the mixing of pesticides. Scores were assigned on a scale ranging from 1 to 5, where 1 meant immediate separation of compounds and 5 the perfect mixture stability up to 30 minutes. The data were submitted to descriptive statistics and presented in tables. Mixture stability differed in glyphosate formulations and their concentrations due to the used spray solution volume. Distinct mixtures between glyphosate (SL) and deltamethrin, as well as between glyphosate (WG) and deltamethrin, were physically compatible when stirred again even after 24 hours at rest. The mixture containing glyphosate (SL), deltamethrin, and fluazinam and trifloxystrobin/ cyproconazole was incompatible at a volume of 30 L ha-1.

Chemical characteristics and compatibility of mixtures at different agricultural application rates

“…Tank mixtures among herbicides Clincher ® + Ricer ® , Clincher ® + Kifix ® , Clincher ® + Imazethapyr Plus Nortox ® , Clincher ® + Ricer ® + Kifix ® , Clincher ® + Ricer ® + Sirius ® 250 CS, Imazethapyr Plus Nortox ® + Basagran ® 600, between herbicides and insecticides Clincher ® + Ricer ® + Arrivo ® 200 EC, Clincher ® + Kifix ® + Arrivo ® 200 EC, Clincher ® + Imazethapyr Plus Nortox ® + Arrivo ® 200 EC, Clincher ® + Ricer ® + Kifix ® + Arrivo ® 200 EC, Clincher ® + Ricer ® + Sirius ® 250 CS + Arrivo ® 200 EC, Imazethapyr Plus Nortox ® + Basagran ® 600 + Arrivo ® 200 EC, among fungicides Alterne ® + Bim ® 750 BR + Priori ® 250 CS, and between fungicides and insecticides Bim ® 750 BR + Actara ® 250 WG, Alterne ® + Bim ® 750 BR + Priori ® 250 CS + Actara ® 250 WG, and Alterne ® + Bim ® 750 BR + Priori ® 250 CS + Talisman ® did not present any physicochemical change in the spray mix and are therefore compatible to be used in mixtures in the spray tank in plant treatments in rice crops. Moraes et al (2019) found compatibility between the Deltamethrinae + Ghyphosate insecticide interaction in spray solution with consistent physicochemical parameters even after 24 hours of rest.…”

Application rate and nozzles associated with droplet electrification affect the spraying quality in common bean

“…However, its importance and applicability are notorious, as it is a strategy with a high operational yield and high efficiency (Antolin et al, 2021). In this sense, landing spraying is one of the most commonly used forms of applying pesticides (Moraes et al, 2019). In most cases, much attention is paid to the product to be used in the application, neglecting the spraying technique (Contiero et al, 2016).…”

Impact of water quality on pesticides and fertilizer compatibility

“…Therefore, they are also essential for resistance management programs. However, inappropriate chemical control can cause irreversible environmental and economic impact (Moraes et al, 2019), e.g. change the efficacy or biological activity (synergism and antagonism, phytotoxicity or persistence).…”