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Increased efficacy and extended shelf life of spinosad formulated in phagostimulant granules against Spodoptera frugiperda

2017; Wiley; Volume: 74; Issue: 1 Linguagem: Inglês

10.1002/ps.4656

1526-4998

Patricia Tamez‐Guerra, Fernando Tamayo‐Mejía, Ricardo Gómez-Flores, Cristina Rodríguez‐Padilla, Gabriela Damas, Reyes Támez-Guerra, María Julissa Ek‐Ramos, Trevor Williams,

Insect Pest Control Strategies

Spinosad is recommended for control of Spodoptera frugiperda (J.E. Smith) larvae; its application with phagostimulants may reduce the quantity of active ingredient required for effective pest control. Spinosad (Tracer®) was formulated in maize flour matrix granules and three field tests compared 10-100 ppm a.i. granules (equivalent to 0.24-2.4 g a.i. ha-1 ) with Tracer as an aqueous spray (200 ppm a.i.; 60 g a.i. ha-1 ), and the recommended application rates of Bacillus thuringiensis, a chemical and an untreated controls were performed.The 100 ppm spinosad granules resulted in similar S. frugiperda mortality compared with the chemical treatments in all three field trials, and resulted in a significantly higher maize grain yield compared with unformulated and control treatments (4141 vs. 2857 and 2407 kg ha-1 , respectively) that was similar to the chemical treatment (3778 kg ha-1 ). Bioassays of granules stored at room and cold temperatures showed that after 5 years, ∼ 70% of the original activity remained (OAR) of spinosad when formulated as granules. Nevertheless, after 9 years, efficacy was reduced (26.2% and 48.5% OAR) at both room (25 °C) and refrigerated temperatures (4 °C).Spinosad, in the granular phagostimulant formulations evaluated in this study, had advantages measured as high efficacy and long shelf life. © 2017 Society of Chemical Industry.