National Academy of Agricultural Sciences (NAAS)
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PRINT ISSN : 2319-7692
Online ISSN : 2319-7706 Issues : 12 per year Publisher : Excellent Publishers Email : editorijcmas@gmail.com / submit@ijcmas.com Editor-in-chief: Dr.M.Prakash Index Copernicus ICV 2018: 95.39 NAAS RATING 2020: 5.38 |
Lettuce is one of the most widely consumed vegetable throughout the world. Amongst various diseases infecting this crop, lettuce drop caused by Sclerotinia sclerotiorum is one of the most prominent and destructive one. Lettuce drop pathogen, S. sclerotiorum produces black, hard survival structures known as sclerotia. In the present studies, carpogenic germination of sclerotia by producing apothecia and releasing ascospores as well as viability of sclerotia was studied. Sclerotia after germination formed funnel shaped cup i.e. apothecium at the tip which were brown in color and were round or globose type. The length of apothecia varied from 4-19 mm, whereas diameter of the apothecial discs ranged from 3-8 mm with number ranging from 1-10 per sclerotia. Viability studies revealed that with the increase in duration of water soaking from 4 days to 32 days, there was a gradual decrease in germination of sclerotia of S. sclerotiorum. 20oC temperature was found to be optimum resulting in maximum sclerotial germination (99.73%) followed by 25, 15, 10 and 30oC temperature. Soil depth (0 to 12cm) was inversely proportional to sclerotial germination and sclerotia placed at soil surface (0 cm soil depth) resulted in highest sclerotial germination (93.75 %) followed by 2, 4 and 6 cm soil depths.
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