ศูนย์นวัตกรรมเทคโนโลยีหลังการเก็บเกี่ยว

Calcium applications before harvest affect the severity of anthracnose fruit rot of greenhouse-grown strawberries.

Smith, B. J.; Gupton, C. L.;

Acta Horticulturae Year: 1993 Issue: No. 348 Pages: 477-482 Ref: 6 ref.

1993

บทคัดย่อ

The effect of calcium solutions applied before harvest on anthracnose infection, caused by Colletotrichum acutatum, of ripe greenhouse grown strawberries was evaluated in 2 studies. In the first study, 2 application methods (soil drench and foliar spray) of 3 calcium sources (calcium sulfate, calcium chloride and calcium nitrate at 2.5 mM Ca2+ prepared in 1/4 strength Hoagland's solution) were compared. In the second study, soil-drench applications of 5 concn (0, 1.25, 2.5, 5 and 10 mM Ca2+) of each of the 3 Ca sources were compared. Treatment solutions were applied 3 times weekly beginning 6 weeks before harvest and continuing through harvest (13 weeks total). Ripe fruit from treated plants were harvested and inoculated with a conidial suspension of C. acutatum. Fruit rot development was rated 72 and 96 h after inoculation. Fruit from plants receiving drench or foliar applications of calcium sulfate developed less fruit rot than fruit from plants receiving water or the calcium chloride or calci

um nitrate treatments. Fruit from plants receiving foliar applications of CaCl2 developed less fruit rot than those from plants receiving soil applications of calcium chloride. Calcium sulfate at 2.5 mM and 1/4 strength Hoagland's solution resulted in the lowest fruit rot severity ratings. This paper was presented at the Second International Strawberry Symposium, held at Beltsville, Maryland, USA, on 13-18 Sep., 1992.