Nhung
Black spots on roses.I have Iceberg roses. I did exactly what you advised. After prunning in winter, I sprayed with Lime Sulfur.
I apply cow manure , Osmocote , Dynamid lifter and Seasol.
From early Octorber I sprayed Rose Shield.
After 2 weeks, I rep
What should I do , Please help me?
My Email address is
trinhsat6@bigpond.com
Your respecfully
Nhung Day
Submitted: 01:58PM, 24 Oct 2009
Answer:
Rose fungicide sprays will only work if the roses are healthy and properly fertilised. If soil pH is too acidic or too alkaline fertilisers may not be completely effective. Weak hungry plants will always have fungal problems and sprays are less effective. Roses need full sun position all day. A complete rose food used at least twice a year will make the plants stronger and we also recommend using sulphate of potash every month during the warm months and garden lime once a year. The potassium and calcium make the leaf cells stronger and help prevent the diseases. Regular applications of liquid seaweed also raise the immune responses in the plants.
Roses require a lot of nutrition so don’t hesitate to throw some compost or rotted manures or soluble liquid fertilisers every now and then.
Never spray if the temperature is approaching 30 degrees or if the soil is dry. this will cause scorching.
Answered:
07:19AM, 06 Nov 2009
Comments (1)
Lyn
Yates site member
14:45, 04 October 2010
I have lots of roses which are all doing rather well in anice sunny spot, the main problem I have is with scale on the stems, I have sprayed with pestoil and also pest oil with a teaspoon of Malathian but I am still having problems.
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