Papaya Leaf Curl

Papaya leaf curl virus

1. THENI PAPAYA LEAF CURL Student Course Teacher Jagadeesh . P Dr. Parthasarathy . S (2015021051) Asst. Prof. (Plant Pathology) COLLEGE OF AGRICULUTRAL TECHNOLOGY Affiliated To Tamilnadu Agricultural University - Coimbatore

2. PAPAYA LEAF CURL VIRUS Host:   Carica papaya  L. ( papaya) Disease name:  Papaya leaf curl Pathogen name:   Papaya leaf curl virus  ( PLCV) Papaya leaf curl was first reported in  Tamil Nadu  in 1939.

3. Systematic position Domain : Virus ( DNA virus) Family   Geminiviridae Genus : Begomovirus Species : Papaya leaf curl virus

4. SYMPTOMS The most prominent symptoms are the rolling of the leaves downward and inward in the form of an inverted cup and the thickening of veins. Sometimes all the leaves at the top of the plant   are affected by these symptoms. In advanced stages of the disease, defoliation takes place and the growth of the plant is arrested.

5. The production of flower and fruits are compromised. Fruits will be detorated in shape and fall immaturely.

6. PLCV Affected plant © APS

7. Mode of spread Vector : Silverleaf whitefly ( Bemisia tabaci ) . Infected seeds, seedling and grafting material. © IARC

8. Prevention Immediately after the disease is noticed , the plant must be uprooted and destroyed. Avoid growing alternative hosts such as tomato and tobacco near papaya. Spray insecticides for vector control.

9. Management Biological : Spray 1% oil emulsion. Chemical : Soil application of Carbofuran (1 kg a.i . / ha) at the time of sowing. 4-5 foliar sprays of Dimethoate (0.05%) or Metasystox (0.02%) or Nuvacron (0.05 %) at an interval of 10 days effectively controls the whitefly population.

10. Reference https://plantix.net/plant-disease/en/200016/papaya-leaf-curl-virus/ https://www.apsnet.org/publications/imageresources/Pages/fi00176.aspx https://en.m.wikipedia.org/wiki/Papaya_leaf_curl_virus R.S Singh, Plant Disease, 9 th Edition, Oxford IBH Publication Co- Pvt .Ltd New Delhi page no: 541 Ashok Aggarwal , R.S Mehrotra , Plant Pathology 3 rd Edition, MC Graw Hill edu,.Pvt.Ltd Chennai Page no : 766