Propyzamide (KERB FLO and generic products) is an essential herbicide molecule for managing weeds in rape plots heavily infested with grasses, particularly when these are resistant to other active ingredients. Propyzamide has a systemic root action on ryegrass, vulpine, cereal regrowth (especially wheat), bromegrass, wild oats (especially winter wild oats), bluegrass, vulpie and bentgrass.

Certain application conditions are essential to optimize efficacy and preserve the molecule's durability:

1. Only one application of propyzamide at 750 g/ha per season, from early November to late December on rapeseed.
2. Do not apply to water-saturated soil, to avoid run-off and reduced efficacy.
3. Aim for application on cool, moist soil. Efficacy depends on soil humidity. Temperatures below 10°C are strongly recommended to ensure persistence of action.

Experimental results show that the application of propyzamide-based products is not very sensitive to biomass, and this should not call into question the optimum period. Due to the foliar broadleaf control action of aminopyralid, IELO / YAGO / BIWIX / DITOP products must be applied within a rain-free period. Applications made too late (beyond November) will lack broadleaf control efficacy.

It's always tempting to save a pass by combining herbicide and insecticide. But this is sometimes a bad economy.

First of all, it's important to consider the need for insecticides. As a reminder, the indicative risk threshold is 5 larvae per plant for well-developed colza and 2 to 3 larvae per plant for small colza or poorly established colza with nitrogen hunger.

In areas with strong resistance to pyrethroids (SKDR sector), the MINECTO GOLD + propyzamide mixture is strongly discouraged by the Institute for accounting and efficacy reasons. MINECTO GOLD must be combined with an oily adjuvant (such as ACTIROB). The presence of oil causes propyzamide to flocculate, greatly reducing its effectiveness. Furthermore, Minecto Gold should be applied when temperatures are mild and larvae are active, to maximize its effectiveness. Propyzamide, on the other hand, is applied in cold weather.

Similarly, in sectors not affected by strong resistance and still using pyrethroids to control flea beetle larvae, it is often preferable to carry out the interventions separately. Indeed, even if in practice the propyzamide + pyrethroid mixture is still possible, the optimum conditions for applying the insecticide (mild temperatures) differ from those for the herbicide (cool temperatures).