Spotted wing drosophila (SWD)

The advance of the spotted wing drosophila is now a fact. It has spread rapidly through Europe, as it has the rest of the world, attacking both ripe and immature fruit. Blackberries, cherries, grapes, raspberries, strawberries and blueberries are all susceptible to the fly. The larvae in the fruit make it unsaleable, which is bad news for fruit growers.

PlantoSys has developed an approach, tested by C. Baroffio, that works. This approach recommends the use of traps along with the removal of overripe fruit as the flies reproduce in rotting fruit. We have also developed several products that when combined strengthen the plant’s natural resistance to Drosophila suzukii: our Ds-mix. It results in a number of physiological changes that enable the plant to suppress the plague and the level of infection.

It is a comprehensive approach:

  • Use traps
  • Hygiene measures: remove overripe fruit
  • Apply Ds-Lime – a leaf fertilizer with a repellent effect on SWD
  • Apply Cuprum – a leaf fertilizer that increases the resistance of plants to bacteria and fungi
  • Apply ManZincum – a leaf fertilizer with a repellent effect on SWD, red spider mite and wasps

Ds-mix spraying schedule

Ds-Lime, Cuprum and ManZincum, combined with traps.

Period of application: from first fruit/capture of first SWD to end of harvest
Interval: every 7 days
Ds-Lime    175 gr/100 liter water
Cuprum    < 750 litres water/ha: 250 ml Cuprum/ha
> 750 litres water/ha: 350 ml Cuprum/ha
ManZincum    < 750 litres water/ha: 750 ml ManZincum/ha
> 750 litres water/ha: 1 litre ManZincum/ha
Amount of water/ha Depending on production and spraying method: 350–1 000 litres water/ha

Spray on dry crop – no dew – and during not too hot and sunny weather to prevent lime deposits on cherries, blackberries and redcurrants, which are more susceptible to this than strawberries, raspberries and blueberries. The instructions can therefore be followed less strictly for these crops.