Zonal geraniums with low pH can exhibit iron and manganese toxicity symptoms, including marginal chlorosis, leaf speckling, and upward-cupping of the leaves, according to Michigan State University experts.
When the weather is moist and humid, susceptible greenhouse plants may need to be protected from Botrytis cinerea, a fungus that causes leaf spots, blighting, and stem cankers.
Heat stress, which can originate from a lack of air flow around baskets suspended in high areas, causes foliar bleaching and chlorosis of zonal geraniums.
Tom Dudek, Senior Educator at Michigan State University Extension, says greenhouse growers should evaluate their production costs to determine if they need to make adjustments to stay competitive.
Recent research is shedding new light on the foxglove aphid. Understanding host plants, identification, and biology will help growers deal with this pest.
According to Michigan State University experts, certain species of the pathogen Phytophthora, which is typically thought of as a root rot, can also cause issues above-ground.
The EPA has made a significant number of changes to the Worker Protection Standard, and growers must be compliant by January 2017. Experts from Michigan State University Extension outline how some of these changes could affect you.
