Studies on Downy Mildew Incidence in Pear! millet Incited by Sclerospora graminicola (Sacc.) Schoret & its Management
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Date
2023-08-02
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Agriculture University, Jodhpur
Abstract
Pearl millet (Pennisetum glaucum (L.) is a monocot species belongs to the
family Poaceae and sub family Penicedae, having diploid genome (2n= 2x =14).
Downy mildew, also known as green ear disease, is one of the most extensively
spread and destructive disease of pearl millet. The pathogen Sclerospora graminicola
showed a wide variation in the expression of symptoms specially in the development
of malformed structures (green ear). Majority of early infected plants remained
stunted and failed to form the ear head. Most of such infected plants of highly
susceptible cultivars were dried and died prematurely.
A survey conducted for downy mildew disease incidence in different tehsils of
Jodhpur district of Rajasthan. Maximum disease incidence was recorded from
Shergarh followed by Lohawat, Osian and Luni. However, minimum per cent diseases
incidence was recorded from Bilara.
Epidemiological study showed that the second fortnight of August to the first
fortnight of September can be considered as window period for downy mildew
incidence.
Out of 35 pearl millet germplasm, none of the germplasm was found highly
resistant (HR), twenty one germplasm found resistant (R) while, the eleven
germplasm moderately resistant (MR), two germplasm moderately susceptible and
one germplasm were found highly susceptible to Sclerospora graminicola.
Out of 34 SSRs, 23 primers were polymorphic and amplified products varied
from 100 to 400 bp and 11 were monomorphic.
Seed treatment with metalaxyl 35% WP @ 6 g/kg seed + foliar spray with
azoxystrobin 23% SC @ Iml/lit. at 40 days after sowing was significantly reduced the
downy mildew incidence and increased the grain and fodder yield.
The seed treatment with Trichoderma viride @ 10g/kg seed + soil application
of T. viride @ 2.5 kg/100 kg FYM significantly reduced the downy mildew incidence
and increased the grain and fodder yield.
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Citation
Surjeet 2023. Studies on Downy Mildew Incidence in Pear! millet Incited by Sclerospora graminicola (Sacc.) Schoret & its Management. M.Sc. Thesis, College of Agriculture, Agriculture University, Jodhpur