|Snapdragons were growing beautifully (from last year). Now they're attacked by zillions of black bugs that are stuck on the plant? scales? What to do?
|Answer from NGA
May 26, 2009
|After first deciding the snapdragons have black aphids, it strikes me that what you are seeing on your plants may be fungal spots. Second year snapdragon plants often develop a rust disease and it shows up as either black or rusty colored spots (pustules) on the leaves. If the black spots are not aphids (squish a few to be sure), then the plants have developed a disease. Once completely involved in this disease, the plants cannot be saved. Pull them out of your garden before the fungal spores reach your other healthy plants.
« Return to the Garden Knowledgebase Homepage