The symptoms of rose black spot and the tobacco mosaic virus (TMV) are shown below. dig up and destroy infected plants wash their hands after handling infected plants wash tools that have come ...
Gray leaf spot. Persistant moisture on the foliage is essential in disease development; spores will not germinate unless there is 6 to 18 hours of water on the leaf surface [2]. Lesions generally form ...
To help you work out why your plant is struggling ... while in other cases, leaves may develop brown spots with a yellow ‘halo’ – a type of disease that can be caused by overwatering.