Exilva microfibrillated cellulose with environmentally friendly wetting agents as a tank-mix adjuvant

Exilva microfibrillated cellulose with environmentally friendly wetting agents as a tank-mix adjuvant

Borregaard has shown through greenhouse testing that its microfibrillated cellulose Exilva, combined with a wetting agent, enhanced the effect of glyphosate more than when using Exilva or the wetting agents alone.

Exilva is a completely natural and infinitely sustainable microfibrillated cellulose that improves the uptake of herbicides, as well as enhances structure in your product formulations. Exilva increases your formulation efficiency, reduces your CO2 footprint and creates exciting opportunities for innovation.

Exilva’s ability to enhance the effect of glyphosate has been shown in greenhouse studies (see the results here). This work was then continued by combining Exilva with two environmentally friendly wetting agents to create a more versatile adjuvant product for herbicides. Tests were performed in greenhouses using black nightshade (Solanum nigrum) as a model plant. The plants were treated with glyphosate and varying amount of Exilva and/or two wetting agents: Elasto G5 (polyglycerol based adjuvant) and Genapol XP080 (an ethoxylated fatty alcohol with a tridecyl carbon chain). The dosage of glyphosate was below the normal use rate to see clearly the adjuvancy effect. Tests were performed by SURfaPLUS
(the Netherlands).

Figure 1 shows the fresh weight of black nightshade plants 2 weeks after treatment. Glyphosate alone at this low dosage (0.6 mM) is not effective in reducing the growth: the fresh weight is 85% of the untreated plants. Adding either 0.02% Exilva or 0.25% Elasto G5 improves the effect significantly. Furthermore, when these two products were combined, the effect was better than with the products alone.

Figure 1

Figure1

The fresh weight of black nightshade (Solanum nigrum) 14 days after glyphosate treatment alone or with 0.02% Exilva and/or 0.25% Elasto G5. The weight is compared to that of untreated plants (%). Sub-optimal dosage of glyphosate was used (0.6 mM) to show the effect of Exilva.

Exilva was also tested in combination with another wetting agent, Genapol XP 080. Exilva was used at standard rate 0.02% (w/w) of the spray solution and combined at two concentrations of Genapol: 0.25% (normal) and 0.02% (reduced). Figure 2 shows that 0.02% Genapol alone increases the effect of glyphosate only moderately and a much greater effect is seen when 0.25% Genapol is used. However, when Genapol is combined with 0.02% Exilva, even the lower dosage of Genapol shows a huge improvement in glyphosate efficacy. This shows that by using Exilva together with a wetting agent, the dosage of the wetting agent can be lowered to one tenth of the original dosage and still achieve better efficacy of glyphosate.

Figure 2

Figure2

The fresh weight of black nightshade (solanum nigrum) 14 days after glyphosate treatment alone or with 0.02% Exilva and/or varying amount of genapol xp080. The weight is compared to that of untreated plants (%). Sub-optimal dosage of glyphosate was used (0.6 mm) to show the effect of Exilva.

Conclusions

In greenhouse testing, Exilva, Borregaard’s microfibrillated cellulose, combined with a wetting agent enhanced the effect of glyphosate more than when using Exilva or the wetting agents alone. By using Exilva, the dosage of a wetting agent could be reduced to 1/10 and still achieve better efficacy of glyphosate than at the original wetting agent dosage. Exilva can be used to create new, environmentally friendly adjuvant systems without compromising weed control.