|Version 2||Date January 2020||Reference 44|
SACOA has invested heavily in independent field research throughout Australia, assessing the effectiveness of various adjuvants with common summer herbicide mixtures on key weeds such as fleabane, melons and feathertop rhodes grass – with some surprising results. This independent work has been conducted with extensive industry collaboration to answer key questions;
Getting herbicides onto and into weed leaves can be tough in summer conditions with drift, evaporation and run-off all contributing to loss. Increased droplet survival allows herbicides more time to enter into weeds, so getting herbicides to work well under summer conditions requires a balance between leaf surface coverage and penetration.
Our coverage analysis work found key differences between adjuvants;
What does that mean for destroying summer weeds fast?
|Figure 1: Impact of adjuvants on a leaf surface. (Source: SACOA)|
Back in November 2014 SACOA published results from our 2012 independent field research indicating ENHANCE® and ANTIEVAP® provided the quickest brownout on melons compared to other adjuvants such as LI700. Our latest research, including some of the newer adjuvants to the market supports this.
|Chart 1: Common melon control mixutres with different adjuvants | Applied 8.12.14 Temp 30.4C, RH 32% Delta T 11.5, Nozzles 6 x AI110015 @ 100L/Ha | Melon stage – 20-30cm diameter. (Source: Trial SE145 – Agvivo Agronomy T. Boyes Quairading Dec 2014)|
|Image 2: Glyphosate 1.5L + Garlon 80ml + 2.4D 500ml (lv ester 680) + Ally 5g + ENHANCE® 1.0% 8DAT on 16 December 2014. (Source: SACOA)|
|Image 3: Untreated control, 8DAT on 16 December 2014. (Source: SACOA)|
|Chart 2: Fleabane Control with different adjuvants with Glyphosate 2.0L + 2,4D 800ml + Ally 5g | Applied 8.12.14 Temp 32.6, RH 32% Delta T 13, Nozzles 6 x AI110015 @ 100L/Ha | Fleabane – 20-30cm high – flowering. (Source: Trial SE146 – Agvivo Agronomy T. Boyes Quairading Dec 2014).|
|Chart 3: Fleabane control using a double knock strategy | Applied 8.12.14 Temp 32.6, RH 32% Delta T 13, Nozzles 6 x AI110015 @ 100L/Ha | Fleabane – 20- 30cm high – flowering (Source: Trial SE146 – Agvivo Agronomy T. Boyes Quairading Dec 2014).|