HORTICULTURE SCIENCE
FLORICULTURE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Apply fungicides when appropriate and adhere to proper watering.
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introduce beneficial microorganisms to the greenhouse environment.
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provide cooler day temps and warmer night temps
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use varieties genetically engineered to be resistant to root rot.
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Detailed explanation-1: -Optimum control of Rhizoctonia is achieved with cultural practices and fungicidal control. Start with thorough removal of all crop debris and sanitation of benches and work areas. Use soil-less growing medium and clean pots and flats.
Detailed explanation-2: -All poinsettia cultivars are susceptible. For disease control, use disease-free cuttings and remove all fallen diseased leaves. Some fungicides, such as azoxys-trobin and thiophanate-methyl, used for powdery mildew control have good activity against scab.
Detailed explanation-3: -In the control of Pythium diseases, emphasis is placed on providing good drainage and water management. Steam (at 140°F for 30 minutes), solarize (double-tent at 160°F for 30 minutes or 140°F at 1 hour), or chemically treat the growing medium.