Leaf curl of tomato

leaf curl disease of tomato

1. L eaf Curl Disease of T omato Topic : Given By : D r Mr Gokul Chandra Biswas Presented By : Jisan Ahmmed Polok A bout Symptomatology Transmission of the virus Management and Cure Conclusion Shahjalal University of Science d Technology , Sylhet Hello everyone

2. A bout Symptomatology Transmission of the virus Management and Cure Conclusion The virus can cause infection at any stage of growth and development of plants.  Again , The disease is caused by different species ( Table 1 ) having circular single-stranded DNA ( ssDNA ), of the genus  Begomovirus , family  Geminiviridae . Tomato ( Lycopersicon esculentum Mill. ) is one of the most economically important vegetable crops in the world . Among the major biotic constraints, virus-associated Tomato leaf curl disease ( ToLCD ) is a major limiting factor affecting its cultivation and yield. Table 1

3. A bout Symptomatology Transmission of the virus Management and Cure Conclusion No. 3 No. 2 No. 1 Leaf curling , Puckering of leaves , vein yellowing Stunting, Excessive branching Smalling of leaves Also deep yellowing of the leaves The symptoms of leaf curl disease are very complex , and the typical symptoms include 

4. A bout Symptomatology Transmission of the virus Management and Cure Conclusion No. 6 No. 5 No. 4 E xtreme d istortion of leaves Stunting Of the plants Premature Drop of flower and fruits Apart from this , it also causes

5. A bout Symptomatology Transmission of the virus Management and Cure Conclusion t his virus is transmitted through whiteflies or through infected transplants. Though take up to three weeks before any symptoms develop , the most common indicator of the disease is the yellowing and upward curling of the leaves which may also appear crumply Normally, i n winter crop the symptoms appeared 25 days post-inoculation , whereas in summer crop , it took not more than 15 days Also, Efficiency of the virus depends on the season and the prevailing temperature of the geographical location. (100% transmission of the virus is possible during 33 to 39 degree C temperature.) Transmission Another cause of tomato plant leaf curling, also known as leaf roll, is attributed to physiological conditions. While its exact cause may be unknown, it’s believed to be a sort of self-defense mechanism . But in the viral case-

6. A bout Symptomatology Transmission of the virus Management and Cure Conclusion Crop rotation Can be utilized for management of disease spread by naturally breaking the life cycles of insect vectors , disease and weeds Source and use of crop transplant It is important in reducing or delaying infection . Nurseries should produce seedlings for commercial distribution in insect-proof environment or under net cover to minimize infestation by the vector and subsequent virus transmission prior to transplanting . Biological control Biopesticides , a mass-produced agent manufactured from a living microorganism or a natural product, may offer a solution to disease control through introduction of predators and parasitoids of the vector. Chemical cintrol F oliar spray of neem ( azadairachtin ) and neem plus can kill the eggs, nymphs, and adults of  B. tabaci . The chemical control method is easy and most commonly used approach against the insect pest.  Again , ToLCV infected plants should be destroyed to prevent further infection Host resistance R esistance approach is an easy, more effective approach for control of viral diseases. Management of viruses is difficult as viruses are systemic in nature, highly variable or diverse, insect vectors, and so on . But m anagement of ToLCV could be achieved by following various management practices - Introducing a host-free period It may delay infection in tomato by reduced whitefly population due to unavailability of proper host

7. about Symptomatology Transmission of the virus Management and Cure C onclusion Begomoviruses are the most important viral pathogens . Tomato leaf curl disease is one of the devastating diseases and has been reported to be associated with several begomoviruses , thus making breeding for resistance more challenging. Adding to this, presence of diverse beta-satellite increases complexity. Climate change and injudicious use of pesticides ensure the persistence of whitefly throughout the year and pose further challenges for the management of the disease. A thorough understanding on variability of the virus complexes and understanding the epidemiology could be an alternative in devising management strategy . Thanks everyone The end .