FUNGAL DISEASES

Journal of General Plant Pathology

, Volume 70, Issue 4, pp 207-211

First online:

Suppressive effect of potassium silicate on powdery mildew of strawberry in hydroponics

  • Takeshi KantoAffiliated withHyogo Prefectural Technology Center for Agriculture, Forestry and Fisheries Email author 
  • , Akihiro MiyoshiAffiliated withHyogo Prefectural Technology Center for Agriculture, Forestry and Fisheries
  • , Takuya OgawaAffiliated withHyogo Prefectural Technology Center for Agriculture, Forestry and Fisheries
  • , Kazumasa MaekawaAffiliated withHyogo Prefectural Technology Center for Agriculture, Forestry and Fisheries
  • , Masataka AinoAffiliated withHyogo Prefectural Technology Center for Agriculture, Forestry and Fisheries

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Abstract

From 1996 to 1997, potassium silicate (SiO2) was tested at 0, 25, 50, and 100 mg l−1 in hydroponics to control powdery mildew. Other elements were added in the usual amounts, and the strawberries were cultivated hydroponically in a greenhouse for 4 months (from October to January). The powdery mildew spread in the control plot, but little mildew developed in the plot with 25 mg l−1 silicate, and none in plots with more than 50 mg l−1 silicate. The suppressive effect lasted for about 4 months on fruits and even longer on leaves. On analysis of mineral content in the leaves, only the silicate content differed markedly between the control and treated plants. Nitrogen, phosphate, potassium, and calcium contents did not differ greatly. The maximum silicate content was about 24 times that of the control, and disease severity decreased significantly when the content was more than 1.5% in the leaves. The hardness of the strawberry leaves, measured by a creep meter, was increased by the silicate treatment.

Key words

Potassium silicate Silicate contents Hardness Sphaerotheca aphanis var. aphanis