Black spot disease thrives during the warm, wet weather in April and can cause the leaves of a rose plant to turn yellow and ...

Roses need careful attention this ... as circular black marks on the leaves before they turn yellow and drop. Article continues below Black spot can quickly worsen in humid environments, seriously ...

which will eventually turn yellow and fall off. In humid weather, black spot disease spreads quickly and will greatly weaken roses to stunt their growth. Black spot will not outright kill roses ...