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Lettuce/Celery Management 12 March 2020 Lettuce and Celery: Disease, Insect & Nutrition Management . propagules and reduces their ability to germinate and cause infection. Lettuce Insect, Disease, and Weed Losses Workshop April 20, 2016 12:00-3:00 pm Yuma Agricultural Center 6425 W. 8th St. Yuma AZ 85364 Agenda 12:00-12:15 Welcome and Introductions John Palumbo 12:15 – 12:45 Explanation of the Lettuce Insect Losses Survey John Palumbo A. The disease was first reported in the Imperial Valley of California in 1934. As the disease progresses, the leaf area covered by the fungus increases, eventually coating the entire leaf with a powdery or dusty appearing growth (Fig. Botryotinia fuckeliana [teleomorph], Phymatotrichopsis omnivora Some fungicides that are effective for control of downy mildew on lettuce include maneb, fosetyl-Al (Aliette), and metalaxyl (Ridomil). Affected tissue will eventually turn brown in color. This disease is caused by Rhizoctonia solani. Lettuce Eating Insects and Lettuce Pest Control Tips. When planning your next crop of lettuce or celery in field, greenhouse and high tunnel, give them a healthy start and keep them clean throughout production with the BioWorks family of products. On the basal leaves appear yellow spots, that after a while is getting dark. Apothecia forcibly release ascospores into the air for a period of 2 to 3 weeks. Diseases affecting lettuce crops are particularly common in warm, moist climates. Lettuce septoria blight (Septoria lactuceae). this is especially important when lettuce plants begin to cover a majority of the bed surface. Fusarium wilt of lettuce is caused by the soil-borne fungus Fusarium oxysporum f. sp. Since it does not overwinter well in cold climates, its population size varies from year to year depending on migration … The state’s warm and moist climate provides the perfect environment for diseases to develop. F. Constant temperatures above approximately 70° F prevent big vein symptom development. = Phymatotrichum omnivorum, Puccinia dioicae Cutworms, whiteflies, leafminers, and slugs are slightly less important greenhouse pests. The spots are bordered by a brown edge. There are no known reliable control methods for this disease, and the difficulty in its management is most often directed at its survival deep in soils and its wide host range. All are in the botanical species Lactuca sativa. Leaf drop of lettuce in Arizona is caused by two pathogenic fungi, Sclerotinia minorand S. sclerotiorum. The destruction of stem tissue causes a St., Yuma AZ 85364 . Most pests can be eliminated by the use of insecticidal soap, introduction of beneficial insects, planting nectar-rich plants (like cilantro or sweet alyssum), spreading organic bait and the use of row covers.. A limiting factor for development of downy mildew in desert production areas is the rare occurrence of persistent cool weather combined with high humidity and rainfall. Turnip mosaic virus, Beet leafhopper-transmitted virescence phytoplasma, Common Names of Diseases, The American Phytopathological Society, https://en.wikipedia.org/w/index.php?title=List_of_lettuce_diseases&oldid=945701703, Short description is different from Wikidata, Creative Commons Attribution-ShareAlike License, Phymatotrichum root rot (cotton root rot), Physiological, Ca** deficiency and high temperature, This page was last edited on 15 March 2020, at 17:05. Root aphids are not visible to the naked eye and can also do great damage LETTUCE DOWNY MILDEW AND MOULDS Insensitivity to the systemic fungicide metalaxyl has been documented for some time. Nutrient deficiencies can be identified in field through visual observations. Leaf veins are prominent when held up to bright light. (PDF, 5.58MB), Presentation Low light intensity tends to favor development of powdery mildew.

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