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Plant NameTypeDescription 
Boron deficiencyTurnip, RutabagaDiseaseInsufficient levels of boron in the soil may cause various symptoms in turnip and rutabaga. General symptoms of boron deficiency include stunting of roots and leaves, distorted foliage, reddish discoloration of leaf edges or undersides, and cracking, water-soaking, or internal discoloration of edible roots. The cores of turnip and rutabaga roots turn glassy or watery in appearance, while the skin of the roots is roughened or russetted. The water-soaked tissues later turn brown to black and become punky in texture. Plants vary widely in their response to boron, which is toxic to plants in high concentrations.
Cabbage maggotTurnip, RutabagaInsectThe cabbage maggot is the larvae of a gray fly that is about 3/16" long. Females lay eggs near the base of plants such as cabbage, broccoli, cauliflower, radish, and turnip. The white larvae make tunnels and grooves in the roots and underground portions of stems. Soft rots often infect these areas, causing further damage. The leaves of affected plants are often yellow and stunted. Severe damage can result in wilting and death of plants. Younger plants are more severely damaged. Mature larvae can be up to 3/8" long. They pupate in the soil, with up to three generations occurring in a season. The last generation of the season overwinters in the soil, hatching into adults in early spring.
Flea beetlesTurnip, RutabagaInsectFlea beetles are small, brown to metallic black beetles with a habit of jumping like fleas when disturbed. They feed on many plants including beets, kale, collards, radish, and many weeds, particularly those in the mustard family. Small round holes are eaten in the leaves, usually early in the season. The larvae typically feed on underground portions of the host plants. Damage can be very severe on seedling plants.