Suppression of Botrytis Blight of Begonia by Trichoderma hamatum 382 in Peat and Compost-Amended Potting Mixes

Plant Disease
L E HorstH A Hoitink

Abstract

Inoculation of an industry standard light sphagnum peat potting mix with Trichoderma hamatum 382 (T382) significantly (P = 0.05) reduced the severity of Botrytis blight, caused by Botrytis cinerea, on begonia plants grown in a greenhouse. In data combined from three experiments, the degree of control provided by T382 did not differ significantly (P = 0.05) from that provided by weekly topical sprays with chlorothalonil. In addition, T382 significantly (P = 0.05) increased shoot dry weight and salability of flowering plants. Incorporation of composted cow manure (5%, vol/vol) into the light peat mix also significantly (P = 0.05) decreased blight severity while shoot dry weight and salability were increased. Blight severity on plants in this compost mix did not differ significantly (P = 0.05) from that on those in the light peat mix inoculated with T382. Finally, T382 and chlorothalonil did not significantly (P = 0.05) affect blight severity, shoot dry weight, or salability of plants grown in the compost mix. Spatial separation was maintained in begonias between the biocontrol agent T382 and the pathogen. It was concluded, therefore, that the decrease in disease severity provided by inoculation of the peat mix with T382 most like...Continue Reading

References

Nov 10, 2001·Annual Review of Phytopathology·HAJ Hoitink, MJ Boehm
Dec 14, 2002·Genesis : the Journal of Genetics and Development·Marcus J MoellerLawrence B Holzman
Oct 24, 2008·Phytopathology·D A Shah, L V Madden
Apr 1, 1997·Plant Disease·John C SuttonR M Valdebenito-Sanhueza

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Citations

Oct 24, 2008·Phytopathology·G AlfanoH A J Hoitink
Aug 30, 2014·Molecular Plant Pathology·Christine M F VosBarbara De Coninck
May 24, 2015·Annual Review of Phytopathology·Robert P Larkin
Aug 28, 2012·Annual Review of Phytopathology·Yitzhak Hadar, Kalliope K Papadopoulou
Nov 3, 2020·Plant Disease·Vladimiro GuarnacciaM Lodovica Gullino

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