B. Meena*
Coconut Research Station, Tamil Nadu Agricultural University, Aliyarnagar– 642 101,
Tamil Nadu, India
Email: meepath@gmail.com
Received-06.03.2023, Revised-17.03.2023, Accepted-26.03.2023
Abstract: Groundnut or Peanut (Arachis hypogaea L.) is an important oilseed crop widely grown in major tropical and sub-tropical regions of the world. Late leaf spot (LLS, Phaeoisariopsis personata) and rust (Puccinia arachidis) are the two major biotic constraints in groundnut of global importance. Six isolates of Bacillus subtilis were isolated from the rhizosphere of groundnut using Nutrient Agar Medium. The effect of Bacillus subtilis isolates against foliar diseases of groundnut was studied under pot culture condition. From the results, it was found that Bacillus subtilis isolate Bs1 was effective in managing the late leaf spot and rust diseases of groundnut. Hence, field experiment was conductedduring 2021 and 2022 using the talc formulation of the effective isolate Bacillus subtilis Bs1 for the management of foliar diseases of groundnut. The pooled mean results of the field experiments conducted during 2021 and 2022revealed that seed treatment with Bacillus subtilis Bbv57 talc formulation @ 10 g/kg seed followed by foliar spray of Tebuconazole 50% + Trifloxystrobin 25% @ 1 g/l at 40 and 60 DAS was effective in managing the foliar diseases of groundnut with the late leaf spot (18.8 PDI) and rust (11.5 PDI) diseases. The maximum late leaf spot of 62.6 PDI and rust of 43.7 PDI respectively were recorded in the untreated control. In addition to disease reduction, the pod yield (2472 kg/ha) and haulm yield (2889 kg/ha) were found to be maximum in this treatment. In the untreated control, minimum pod yield of 1871 kg/ha and haulm yield of 2026 kg/ha were observed.
Keywords: Groundnut, Late leaf spot, Rust, Bacillus, Fungicides
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