In a complex cycle, resistant weeds pose a new threat to wheat

In a complex cycle, resistant weeds pose a new threat to wheat

After dealing with a lack of moisture in crops, several agricultural regions are now experiencing outbreaks of influenza, for which there is still no effective treatment.

Argentinian wheat in the midst of a race to harvest with hurdles
Argentinian wheat in the midst of a race to harvest with hurdles

After problematic implantation, wheat is cultivated under different conditions depending on the rains received. In general, recent rainfall was more generous south and northeast of Buenos Aires and south of Santa Fe, but sparser in Córdoba, west of Buenos Aires, and La Pampa. Meanwhile, in-treatment water requirements are limited and the 2022/2023 wheat race will be determined from early September, when engines should be at full capacity as the yield-determining stages begin.

Meanwhile, growers face the challenge of managing crop resistance, with the addition of herbicide-resistant turf in 2021 and 2022. It is widespread in the southern cultivation area – Balcars and Ayacucho – where it can reduce wheat yields by up to 80% according to technician Ramon Guigon. It resists not only glyphosate, but also 2,4D, dicamba and metsulfuron. Radish control is more difficult than fighting rye or red yuyo, for which there are already several effective recipes; Strategies for testing turnstiles.

Ambushed mushroom

Flurocoridone, MCPA, paraquat and other herbicides are being tested in small plant applications. For plots with greater weed development, a “double shot” technique can be used. For now, turfgrass is a serious problem for growers in the South, but it’s only a matter of time before it spreads to other areas, as it did with ryegrass, which appeared in this area and is now being seen in General Villegas and the South. Cordoba, as a result of the transit technique.

The wet weather also resulted in yellow spot, which had to be controlled with treatments. These days, the appearance of rust is observed. Applications must be planned in advance and stock of products must be available, as there are logistical problems when purchasing them: not all fungicides are available at all points of sale and prices vary. A history that repeats itself with other phytosanitary products.

The delay in action of many fungicides must also be considered: a week can elapse between application and observation of effects, so initiation should not be delayed.

Source: La Nacion

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