Are marigolds pest free?


Are marigolds pest free?


While marigolds are seldom bothered by insects and diseases, they are not problem free.  Spider mites can devastate marigolds in hot, dry weather.  Grasshoppers can also cause considerable damage.  Aster yellows is an occasional disease problem.  Aster yellows is caused by microorganisms called phytoplasmas.  The disease is transmitted from plant to plant by sap-sucking insects, such as leafhoppers.  Marigolds infected with aster yellows are stunted, yellow-green in color, and their flower buds fail to open.  Infected plants should be dug up and destroyed.  


Links to this article are strongly encouraged, and this article may be republished without further permission if published as written and if credit is given to the author, Horticulture and Home Pest News, and Iowa State University Extension and Outreach. If this article is to be used in any other manner, permission from the author is required. This article was originally published on . The information contained within may not be the most current and accurate depending on when it is accessed.