Presentation (2).pptx papaya leaf curl disease

Understanding the disease of papaya leaf curl how it spread and control measures to prevent.

1. Papaya leaf curl disease By sridevi B.Sc 1 st year cbz Loyala college manvi Reg :- U23CD25S0050

2. Host:- carica papaya Disease name:- papaya leaf curl Pathogen name:- papaya leaf curl virus (PLCV) It belong to the genus Begomovirus family germiniviridae The virus is transmitted by whiteflies ( Bemisia tabaci ) Whitefly ( Bemisia tsbaci ) – tranmits the virus from infected to healthy plants Papaya leaf curl was first reported in Tamilnadu in 1939 Papaya leaf curl disease was first reported by Thomas and krishnaswamy

3. Symptoms 1) curling of leaves – leaves curl upward and inward 2) Thickening and leathery texture of leaves 3) Reducation in leaf size- leaves become small and deformed 4) yellowing (chlorosis) appears in the veins and leaf lamina 5) stunted growth- the entire plant becomes bushy and dwarfed 6) flower and fruit drop very few or no fruits develop * favorable conditions Warm and humid weather High whitefly population

4. Disease cycle The virus survives in infected papaya plants and in alternate host weeds The whitefly vector acquires the virus while feeding on infected plants When it feeds on a healthy plants, it transmits the virus The virus multiplies within the new plant and symptoms appear in 2-3 weeks * management/ control measure 1) culture control Use disease free seedlings Remove and destroy infected plants immediately Maintain field sanitation eliminate weeds that harbor whiteflys Crop rotation with non host crops Spacing between plants to improve aeration

5. 2) Chemical control Spray insecticides to control whiteflies Imidaclopride (0.05%) Dimethoate (0.05%) Thiamethoxam (0.025%) Repeat sprays at 10-15 day intervals in needed 3) Biological control Use natural enemies of whitefly:- encarsia formosa , chrysoperla carnea , 4) Resistant varieties Research is ongoing to develop virus:- tolerant papaya varieties, but none are fally resistant yet

6. Economic important Causes severe yield loss- up to 70-100% in heavily invested fields. Reduces fruit quality and market value Major constraint in papaya Cultivation across tropical regions

7. Leaf curl of papaya