Studies on Blast [Pyricularia grisea (Cooke) Sacc.] of Pearl millet [Pennisetum glaucum (L) R. Br] and it’s Management
Loading...
Date
2021-08-08
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Agriculture University, Jodhpur
Abstract
Pearl millet [Pennisetum glaucum (L.) R. Br] is a distinctive crop among the
leading cereals, excellent fodder crop for livestock and staple food of the world's poor
and most food insecure communities in the arid, semi-arid, tropical and sub-tropical
areas of Asia and Africa. It is known through different names like Bajra, Bulrush or
Spiked millet. It is a C4 cereal, belonging to family Poaceae (formerly Gramineae)
and native place is central Africa. Pearl millet affected by a number of disease caused
by fungus, bacteria, viruses and nematodes. Among all, pearl millet blast caused by
Pyricularia grisea is one of the most important disease. The disease appears on
foliage as greyish, water-soaked lesions that enlarge and become necrotic, resulting in
extensive chlorosis which leads premature drying of young leaves. The annual losses
in yield due to blast alone range from 1-60%. The detailed investigations on various
aspects were carried out in the present study. A survey conducted for blast disease
severity in different districts of Western Rajasthan showed that Nagaur recorded
highest blast disease severity (43.4%) followed by Jodhpur (36.8%) , Barmer (22.4%),
Jaisalmer (21.4%) and minimum disease severity was recorded in Pali (16.6%). The
disease samples with characteristic symptoms were collected from the farmer’s field
and were subjected to isolate by following standard tissue isolation method and
revealed the association of Pyricularia grisea after studying the cultural and
morphological characters of the fungus and the pathogenicity was proved by
following Koch’s Postulates. Thirty-two hybrids including with one susceptible
checks were screened against Pyricularia grisea pathogen, None of the cultivars
showed highly resistant and resistant reaction under field condition. Among the
fungicides screened in vitro, complete mycelial growth inhibition of P. grisea was
observed in Tricyclazole, carbendazim 12% + mancozeb 63% and tebuconazole 50%
+ trifloxystrobin 25%. Chlorothalonil gave lowest effect in inhibiting the mycelia
growth (46, 48& 51%) at, 1000, 1500 and 2000 ppm concentrations. Trichoderma
harzianum (76.17%) was found most efficient bio-agent in inhibiting the mycelial
growth of P. grisea under in vitro condition.
Description
Keywords
Citation
Kumar Mukesh 2021. Studies on Blast [Pyricularia grisea (Cooke) Sacc.] of Pearl millet [Pennisetum glaucum (L) R. Br] and it’s Management. M.Sc. thesis, College of Agriculture, Agriculture University, Jodhpur