Alternaria brassicae, A. brassicicola
Most crucifer plants are susceptible to Alternaria leaf spot and plants at all growth stages may be affected. Symptoms caused by the two pathogens are very similar and both may be found on the same plant. Infection of seedling stems may result in damping-off or stunted plants.
This publication is an extensive vegetable production guide that addresses topics such as marketing aspects for production decisions, general production considerations, insect management, weed management, and disease management. You will find specific information for the following crops:
Update on diamondback moth (Plutella xylostella) insecticide resistance and the vegetable brassica insecticide management strategy
Turnip Mosaic Virus (TuMV) infects most cruciferous plants, but is most damaging in Chinese cabbage, turnip, mustard, and radish. The most common symptom in these crops is a distinct mosaic of light and dark green colors in the leaves. Depending upon the virus strain and the crop species, necrotic streaks, flecks, or ringspots may also occur. Necrotic spots and ringspots are the primary symptom in common cabbage, but the severity of symptoms is cultivar dependent.
The Guide is divided into three sections. The first section provides cultural information and management practices for a number of important vegetable crop groups. For each family, key pests and disease problems are described. Cultural methods and management practices that will help control each problem are listed, as well as materials that may be recommended for use.
Xanthomonas campestris pv. Armoraciae
Xanthomonas leaf spot occurs on all cultivated crucifers and several wild crucifers. The major symptom is leaf spotting, but lesions can also occur on cotyledons, flower stalks, and fruit. Small leaf spots occur scattered over the leaf surface as a result of invasion of bacterium through pores.