Phytophthora cactorum

Causes crown rot in strawberries.

For propagating tray plants, we recommend:

  • treating the mother plants with Argicin®Plus twice (at an interval of seven days) before taking the cuttings
  • submersing the fresh cuttings in a solution of 1 litre of Argicin®Plus in 100 litres of water for 15 minutes
  • spraying three times with Argicin®Plus (at intervals of seven days) after planting the cutting in trays


For production on substrate, our advice is to:

  • submerse the tray plants in a solution of 1 litre of Argicin®Plus in 100 litres of water for 15 minutes before planting,
  • start drip feeding 1 litre of SalicylPure/ha/week on the third or fourth day after planting


This comprehensive course of treatment accelerates initial growth of the plants by 30–40%, with more leaf, more root, more photosynthesis and more plant. Continue drip feeding with SalicylPure once a week during production to help the plant maintain this head start. This resulted in an extra 9–10% more kilos of Elsanta harvested per hectare in a gutter production system. These extra kilos were not just due to larger fruit, but the fruit were firmer and had a consistently high Brix value. In this way, therefore, better use is made of the potential your plant grower invests in the tray plant.

For outdoor propagation, we recommend:

  • treating the mother plants with Argicin®Plus twice (at an interval of seven days) before taking the cuttings
  • submersing the fresh cuttings in a solution of 1 litre of Argicin®Plus in 100 litres of water for 15 minutes
  • spraying three times with Argicin®Plus (at intervals of seven days) after planting the cuttings out
     

This provides the cutting with the best possible chance of taking root and growing in the field at a time that it is subjected to the most invasive process with the highest risk of infection.

For outdoor strawberry production:

  • submerse the defrosted frigos or AA plants in a solution of 1 litre of Argicin®Plus in 100 litres of water for 15 minutes before planting and
  • immediately after planting and until the first fruit begin to colour, spray weekly with Argicin®Plus, then
  • switch to spraying with our Ds-mix
     

Research carried out by WUR (Wageningen University and Reseach Centre, The Netherlands) into Phytophthora cactorum in strawberries proved the effectiveness of salicylic acid (the active ingredient in SalicylPure). The results showed the contribution made by salicylic acid to preventing a Phytophthora cactorum infection. The research was repeated twice, and each time conducted four times, and always with the same result. Natural salicylic acid was used, the active ingredient in our SalicylPure product.

In 2014, DLV Plant (now Delphy) and Berry Plaza conducted a practical test in gutter production that showed the same results. The application of salicylic acid resulted in significantly less Phytophthora and less powdery mildew. The result was a more vigorous plant that produced more sugars and therefore heavier fruit. The outcome of these results is that more and more strawberry growers are applying our salicylic acid products.