As they mature, fungus fruiting structures are visible on the underside of the leaf. This growth is especially noticeable in the morning following a period of mild temperatures, high humidity and no wind. Petiole and stem lesions are indistinct, elongated and gray to black in color.
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In rainy weather, bacterial soft rot may invade plants weakened by downy mildew. Fungicides can be used as preventative sprays. Follow cultural practices to reduce inoculum build up and spread. Black Rot bacterium — Xanthomonas campestris pv. The bacteria enters through the water pores at the leaf margin and then move downward in the vascular strands of the leaf. In black rot infected leaves, the vascular system appears to have black to dark gray strands running through the tissue.
Once infected leaves rapidly collapse. Infected leaves after harvest continue to break down in storage. The bacterium is carried in seed and can survive for a short time in the soil. Disease spread within a field is by rain, irrigation water or mechanical injury. Follow a least a 1 year. Longer rotations with non-cruciferous crops are suggested if the disease has been especially severe. Cultural practices can be used to reduce infection. Damage will be first visible on lower foliage. Bacterial Leaf Spot bacterium — Xanthomonas campestris pv.
Foliage symptoms are pinpoint, watersoaked, olive green lesions See Photo. As they enlarge the lesions become translucent spots with watersoaked margins. The bacteria not only are spread on infected seed but can possibly survive in the soil and on crop residue for a short period of time. The bacteria are spread by splashing rain and equipment. Cultural practices that reduce the time foliage is wet help to reduce infection. Fungicides used for black rot control will also help to control this organism. Turnip Mosaic virus : Leaves of infected plants are mottled and distorted.
The entire plant is stunted and yields are reduced See Photo. Aphids transmit the virus from diseased plants and weeds to healthy plants See Photo. Field sanitation is important. At the end of harvest, diseased plants or those plants not harvested should be shredded and plowed under or tilled to reduce inoculum increase in an area.
Control cruciferous weeds in and around the field or garden. Volunteer mustard and turnip plants should be destroyed. Skip to content. Table 1. Table 2. Date of last application, 14 days before harvest. Turnips only. Microthiol Special sulfur 3 — 10 lb 14 day Begin at first sigh on foliage symptoms. Can be applied up to harvest. Effective against Powdery Mildew only. Thiolux sulfur 3 — 10 lb 10 — 14 day Same as Microthiol Special. Table 3. Table 4. Table 5.
Destroy diseased plants by shredding and disking or tilling as soon as harvest is completed. Control aphids. Avoid applying high levels of nitrogen fertilizer. This download Vegetable Diseases: made installed by the Firebase soprano Interface. Your page received a application that this sind could not write.
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