Diseases
Botrytis - Promoted by flowers dropping from hanging baskets
Botrytis cinera causes leaf
blight, bulb rot, fruit rot, crown rot,and stem canker on a wide variety of plants. The pathogen is ubiquitous in the environment and attacks injured or senescent plant tissue. Botrytis can be controlled by management of
environmental conditions, sound cultural practices, and fungicide
applications. Control weeds and remove
plant debris. Space plants to allow good
air circulation, reduce humidity within the canopy, and minimize leaf
wetness. Improve horizontal air flow
with fans. Reduce humidity by a combination of heating and venting in the
evening, particularly when warm days are followed by cool nights Water in the morning if practical. Fungicides appropriate for Botrytis include
26 GT, 26/36, Compass, Cleary's 3336, Botran, Decree, Daconil, Dithane,
Heritage, Exotherm Termil, Sextant, Protect DF, and Medallion. Check label for
host appropriateness. Resistance to Cleary's
3336, 26 GT, and Sextant has been reported in Botrytis populations. Always alternate fungicide applications
between materials with different modes of action to prevent resistance
development.
See fact sheet Gray Mold on the UConn IPM Web site. (click greenhouse on left and then scroll)
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