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Improved chemical control of Botrytis blight in roses.

Grinstein, A.; Riven, Y.; Elad, Y.;

Phytoparasitica Year: 1997 Vol: 25 Issue: Supplement Pages: 87S-92S Ref: 10 ref.

1997

บทคัดย่อ

Improved chemical control of Botrytis blight in roses.

B. cinerea causes latent infections of roses, which can develop into aggressive rot (Botrytis blight) at pre- and postharvest stages. Botrytis blight is the cause of major flower losses. The effect of deposit and cover density of fungicides (pyrimethanil or prochloraz-Zn - folpet) on the development of blight was tested. For pyrimethanil, drop size and cover density (ranging between 80 and 1000 micro m drops/cm2) had no effect on disease rate, if the pesticide deposit was sufficient for disease control. For prochloraz-Zn - folpet, however, control efficacy (for equal deposit) increased with cover density. Secondary distribution of pyrimethanil was by the vapour phase. Effective control was obtained when rose petals were exposed only to pyrimethanil vapours, while any direct contact with the fungicide was prevented; no control was recorded for prochloraz-Zn - folpet under these conditions. Blight was delayed in cut flowers when bunches of 20 flowers were wrapped in packing paper strips or celloph

ane bags which had been sprayed previously with pyrimethanil and packed (20 bunches) in cardboard boxes. No pesticide stains could be seen on the flowers.