Studies on Blast [Pyricularia grisea (Cooke) Sacc.] of Pearl millet [Pennisetum glaucum (L) R. Br] and it’s Management

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Agriculture University, Jodhpur
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.
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