Effect of bioagents and chemicals for the management of aerial blight and dry root rot of blackgram incited by Rhizoctonia bataticola

Abstract

Blackgram (Vigna mungo L.) is an important pulse crop grown throughout India. A new disease of blackgram i.e. aerial blight and dry root rot caused by Rhizoctonia bataticola is primarily a soil inhabitant. An attempt was made to manage the disease with biocontrol agents and fungicides. Among the biocontrol agents tested against Rhizoctonia bataticola, Pseudomonas fluorescens (DAPG +ve)-RP46 was found more effective as compared to other bio-control agents and inhibited maximum mycelia growth (68.95%) of R. bataticola followed by T. harzianum (Th-R) (61.85%) and T. viride (Tv-R) (61.11%) under in vitro condition. Fungicides like contact, systemic and combi products were also tested against the aforementioned pathogen. Among five contact fungicides captan, propineb and zineb recorded cent per cent inhibition (100%) of mycelial growth at all the concentrations (i.e., 0.1, 0.2 and 0.3%) among seven systemic fungicides and combi fungicides tested, benomyl, carbendazim, hexaconazole, thiophanate methyl and tridemefon showed 100 per cent mycelia inhibition and also in carbendazim 12% + mancozeb 63%, cymoxanil 8%+ mancozeb 64%, captan70% + hexaconazole 5 %, tricyclozole 18% + mancozeb 62% and mancozeb (64 %) + metalaxyl (4 %) showed cent per cent (100%) inhibition at all the concentrations (0.05, 0.10 and 0.2%), respectively. The maximum vigour index of 2652.83 was recorded in Pseudomonas fluorescens (+DAPG)-RP46 treated blackgram seeds followed by 2042.00 and 1997.80 vigour index in Trichoderma harzianum-II(R) and T. viride-II(R) and poor vigour index of 1258.00 was observed in untreated control. How to view point the article : Sangappa, G. and Mallesh, S.B. (2016). Effect of bioagents and chemicals for the management of aerial blight and dry root rot of blackgram incited by

Screening of Different Bioagents and Fungicides against Dry Root Rot of Chickpea Incited by Macrophomina phaseolina (Tassi) Goid

“…Among the seven Trichoderma spp, T. harzianum inhibited maximum of 77.77%. Similar results were published bySangappa and mallesh (2016). Thombre B.…”

“…The results stated that tebuconazole 50%+ trifloxystrobin 25% W G fungicide reported maximum inhibition of mycelial growth at 100 ppm followed by carbendazim 12%+ mancozeb 63% WP. Sangappa and Mallesh (2016) revealed that cent per cent mycelial growth inhibition was seen in treatment with carbendazim at 0.05, 0.1 and 0.2%.concentrations. Kumar Screening of Different Bioagents and Fungicides against Dry Root Rot of Chickpea Incited by Macrophomina phaseolina (Tassi) Goid et al (2021) found that tebuconazole 25.9% EC was most effective in inhibiting the mycelial growth of the pathogen followed by trifloxystrobin 25% + tebuconazole 50% W G.…”

Evaluation of Different Fungicides against Macrophomina phaseolina (Tassi) Goid. Causing Dry Root Rot of Chickpea (Cicer arietinum L.) invitro

“…The results are in accords with work of the Maruti et al, (2017) found that carbendazim 12% + mancozeb 63% WP, carboxin 37.5% + thiram 37.5% WP showedcent per cent of inhibition of R. bataticola at all the concentrations i.e., 0.10%, 0.20% and 0.30%. Sangappa and Mallesh (2016) observed that carbendazim 12% + mancozeb 63%, showed complete inhibition of mycelial growth at all the concentrations, i.e., 0.05, 0.10 and 0.2%.…”

“…Maruti et al, (2017) reported that mancozeb and thiram showed 100 per cent inhibition at 0.3 per cent concentration. Sangappa and Mallesh (2016) recorded that the fungicides thiophanate methyl and triadimefon showed 100 per cent mycelia inhibition at 0.1, 0.2 and 0.3%.…”

Integrated Management of Dry Root Rot of Blackgram Caused by Rhizoctonia bataticola

“…Bavistin (2 g kg-1 seed) + neem extract (20%) was the most effective treatment with 67.3% reduction followed by T. harzianum (15 g kg-1 seed) + Bavistin (54.2%). (Ramadoss andSivaprakasam (1994), Prajapati et al, (2002) and Sangappa and Mallesh (2016). Khan et al, (2012) reported that indofilm-45, Bavistin, companion, copperoxycloride and Benelate were completely inhibited the growth of the fungus on potato dextrose agar medium.…”