Or petioles from wilted areas of diseased plants are cut, a reddish-brown discolorationĬan be seen between the pith (center of the stem) and the outer green part of the Progresses up the stem until all of the foliage is killed and the plant dies. Symptoms may first occur on only one side of the plant (Figure 1). The first symptom is usually a yellowing of the lower leaves, which gradually wiltĪnd die. Verticillium wilt is easily confused with Fusarium wilt, but Wilt diseases are caused by pathogens that invade the vascular system (xylem tissue)Īnd disrupt water flow through the plant. The latest recommendations for chemical control of tomato diseases. Plant Disease and Weed Control (E-832) or the local county Extension educator for Consult the current Extension Agents Handbook of Insect, The registration status, rates, timings and method of application Lists many disease-resistant tomato varieties known to perform well in Oklahoma.Ĭhemical control is sometimes necessary because resistance is not yet available for “F1” indicates resistance to the original strain (race 1), while “F2 andį3” indicate resistance to new strains (races 2 and 3). Of the Fusarium wilt fungus have developed that can overcome previously resistant Or on seed packages to designate resistance to the corresponding diseases. Or “St” (Stemphyllium-gray leaf spot) appear in the variety descriptions in seed catalogs “T” or “TMV” (tobacco mosaic virus), “A” or “ASC” (Alternaria stem canker) and “S” The letters “V” (Verticillium wilt), “F” (Fusarium wilt), “N” (root-knot nematode), Have been developed with resistance to one or more of the common tomato diseases. Fortunately, many excellent tomato varieties Disease resistance can be utilized to solve current problems Planting disease-resistant varieties is probably the most effective and economical Wet the foliage and fruit are more likely to develop disease problems than those watered Tomatoes irrigated by sprinkler systems that On the ground will develop more soil rot problems, while fruit on staked or trellised Of the crop will also influence what diseases may develop. These crops are susceptible to many of the same diseases. Vegetables such as pepper, eggplant and potato should be avoided in rotations with Practice for reducing losses from plant diseases. Infectious diseases may be carried on tomato seed. It is critical to start with disease-free transplants because many Cultural practices are aimed at avoiding disease or delaying cultural practices,ĭisease resistant varieties, and use of chemicals) are integrated into an overall Laboratory for an accurate diagnosis, particularly when a new disease is encountered.Ĭontrol of tomato diseases is best if all available methods (i.e. To submit samples of diseased plants to the OSU Plant Disease and Insect Diagnostic Often, symptoms of diseases are non-typical or confusing. Non-infectious diseases of tomato are covered in Extension Fact Sheet EPP-7627. Diseases of tomatoes caused by bacteria, viruses,Īnd nematodes are described in Extension Fact Sheet EPP-7626. Fungi are the most common cause of infectious plantĭiseases and can be very destructive. Thisįact Sheet is intended to aid vegetable producers in recognizing the symptoms of common Such as blossom-end rot, is a wasted expense that will not correct the problem. For example, use of a fungicide to control a non-infectious disease, It is critical for effective disease control to recognize the difference between infectiousĪnd non-infectious diseases, and the type of microorganism causing an infectious diseaseīe determined. The distribution of the disease may be quite uniform and extensive if an entire planting Non-infectious diseases cannot spread from plant to plant however, The second group includes those caused by non-infectious physical or chemicalįactors, such as adverse environmental factors, nutritional or physiological disordersĪnd herbicide injury. These diseases are contagious and can spreadįrom plant to plant in a field, often very rapidly when environmental conditions areįavorable. The first are those caused by infectious microorganisms that includeįungi, bacteria, viruses and nematodes. Diseases are a major limiting factor for tomato production.
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