Spray droplet size and carrier volume effect on dicamba and glufosinate efficacy

Abstract

Convoluted interactions occur between droplet size, carrier volume, and other application parameters. Recommendations for optimizing herbicide applications based on droplet size should be based on a site-specific management approach to better account for these interactions. © 2018 Society of Chemical Industry.

Droplet size and physicochemical property effects on herbicide efficacy of pre‐emergence herbicides in soybean (Glycine max (L.) Merr)

“…Droplet size effects on POST herbicide efficacy depends on the herbicide used and the weed species present. Previous studies examined droplet size effects on weed control of common POST herbicides like 2,4‐D, atrazine, cloransulam‐methyl, dicamba, glufosinate and saflufenacil . Differences in droplet size response have been shown to be herbicide and weed specific .…”

“…Among the variables affecting herbicide efficacy, nozzle selection is critical due to direct impacts on droplet size, spray coverage and deposition, drift control and herbicide efficacy. The influence of droplet size on pesticides, especially for post‐emergence herbicides (POSTs), has been studied by several authors . Droplet size effects on POST herbicide efficacy depends on the herbicide used and the weed species present.…”

“…Coarse droplets tended to increase weed control with 2,4‐D, while application of cloransulam‐methyl resulted in a nearly 80% weed control increase when droplet size decreased from Extremely‐Coarse (D V0.5 of 637 μm) to Fine (D V0.5 of 228 μm). Greater weed control for dicamba and glufosinate has been shown with droplet sizes of 900 μm and 605 μm (D V0.5 ), respectively …”

Spray particle drift mitigation using field corn (Zea mays L.) as a drift barrier

“…20 Although increasing spray droplet size mitigates particle drift, the aforementioned variables that influence droplet size can become challenging for applicators to effectively manage. Previous work illustrated the importance of alternative particle drift mitigation efforts to increasing spray droplet size, as losses in herbicide 21,22 and insecticide 23 efficacy were reported as droplet size increased.…”

Optimum Droplet Size Using a Pulse‐Width Modulation Sprayer for Applications of 2,4‐D Choline Plus Glyphosate

“…However, the translocation of 2,4‐D (2,4‐dichlorophenoxyacetic acid, dimethylamine salt) increased as droplet size decreased, indicating droplet size played a role in 2,4‐D efficacy (Wolf et al, 1992). Additionally, several other systemic herbicides (Prasad and Cadogan, 1992), including two formulations of dicamba [3,6‐dichloro‐o‐anisic acid, N,N‐Bis‐(3‐aminopropyl)methylamine and dicglycolamine salts], had efficacy reductions when droplet size increased (Butts et al, 2018b; Meyer et al, 2016). Droplet size impacts on systemic herbicide efficacy are convoluted; however, site‐specific weed management strategies can assist with more effectively using optimum droplet sizes (Tian et al, 1999; Wilkerson et al, 2004).…”