Bioefficacy of Chemicals against Bacterial Leaf Blight Disease of Rice

2019

Rice (Oryza sativa L.) belongs to family Poaceae (Gramineae) and widely cultivated in the India. The maximum losses of rice crop by Bacterial leaf blight stands one of the important disease of rice caused by Xanthomonas oryzae Pv. oryzae and which reduces the yield upto 50% in the world. In India yield losses due to this disease is up to 81.3%. In present investigation, different chemicals were tested under in vitro and in vivo condition against Bacterial leaf blight disease of rice causing by Xanthomonas oryzae pv. oryzae. Combination of [Azoxystrobin 25% + Difenoconazole 12.5%] @ 300 ppm + Streptocycline @ 200 ppm was found most effective with inhibition 31.62% and was at par with [Mancozeb (12%) + Carbendazim (63%)] @ 500 ppm + Streptocycline @ 200 ppm 30.48% inhibition against Xanthomonas oryzae pv. oryzae. Fungicide alone tested at different concentration and found that [Azoxystrobin 25% + Difenoconazole 12.5%] @ 300 ppm was found most effective with inhibition 21.66% and was a...

Journal of Pharmacognosy and Phytochemistry, 2020

Rice (Oryza sativa L.) belongs to family Poaceae (Gramineae) and widely cultivated in the India. Bacterial leaf blight (BLB) of rice caused by Xanthomonas oryzae pv. oryzae is emerging as serious threat to rice production worldwide, including India & its state of Bihar. Keeping in view enormous losses caused by this disease an attempt has been made to control this disease through chemicals. Five fungicides and two antibiotics were tested in field condition, Combination of Copper oxychloride @ 0.3% + Streptocycline @ 0.005% was found maximum mean incubation period i.e. 15.20 days. Significantly minimum per cent disease index were recorded in Copper oxychloride @ 0.3% + Streptocycline @ 0.005% i.e. 34.72% mean disease index as compared to control 63.89%. Maximum biological yield (122.78 q/ha), straw yield (73.67 q/ha), yield (49.11 q/ha) and chlorophyll content SPAD value (34.14) were observed in treatment Copper oxychloride @ 0.3% + Streptocycline @ 0.005% which was followed by Coppe...

J. Agric. Res, 2012

Journal of Applied and Natural Science, 2014

Present investigation was carried out to test the effect of time of application on efficacy of Trichoderma harzianum and Pseudomonas fluorescens formulations against bacterial leaf blight of rice, under field condition. Foliar sprays with bioagent(s) in three time sequences i.e. 7 days before, simultaneously and 7 days after inoculation of Xanthomonas oryzae pv. oryzae inoculation significantly reduced disease severity over check during Kharif 2006 and 2007. Maximum reduction in bacterial leaf blight disease was obtained with the application of T. harzianum on 7 days before inoculation of pathogen during Kharif 2006 and 2007 and maximum increase in grain yield was obtained with the application of PBA-2 seven days before inoculation of pathogen. It was revealed that prophylactic spray of bioagents one week prior to pathogen inoculation was significantly (106 cfu/g) effective in reducing disease severity of bacterial leaf blight of rice as compared to chemical treatment.

Pakistan Journal of Agricultural Research, 2018

Journal of Applied and Natural Science, 2013

In the present study, Trichoderma harzianum, T. hamatum, T. virens and three isolates of Trichoderma spp. were evaluated for their comparative efficacy against bacterial leaf blight of rice, under field conditions. All the bioagent formulations were significantly effective in reducing disease severity over check during Kharif season 2006 and 2007. T. harzianum was found to be most effective and resulted 48.26 and 59.22 % reduction in disease severity during Kharif season 2006 and 2007, respectively. Maximum increase in grain yield (16.21%) was recorded with T. harzianum followed by isolate 40 (14.58%), during Kharif season 2006. Whereas during Kharif season 2007, maximum increase in grain yield (18.95%) was recorded with T. harzianum which is followed by T. virens (14.65%) and isolate 40 (12.57 %). Present study revealed that T. harzianum (isolated from rice phylloplane) was found to be most effective in reducing disease severity and increasing grain yield as compared to other isola...

Field trials conducted at CCSHAU Rice Research Station, Kaul during Kharif 2003 to 2009 revealed that out of 4052 rice genotypes and 22 near isogenic lines (NILs) evaluated under artificial epiphytotics, 45 genotypes viz. BC1F1-1094-128-549-0-1-0, BC4F1-111-120-2735-12, CR 837, CRK 22, CRMAS 2231-36, CRMAS 2231-37, CRMAS 2231-48, CRMAS 2232-23, CRMAS 2621-7-1, CRMAS 2621-7-2, CRMAS 2622-2-2, CRMAS 2622-3-4, CRMAS 2622-7-6, CRMAS 2622-43-5, HKR 95-75, HKR 95-128, HKR 95-131, HKR 95-138, HKR 99-57, HKR 99-58, HKR 99-60 (HKR 48), HKR 2000-57, HKR 2001-115, HKR 2001-116, PAU 1973-121-1-2-1-1, PAU 2020-10-3-1, PAU 2520-3-2-3-2-1-2-2-2, PAU 2769-20-2-3-3-2-1-2, PAU 2991-48-2, PAU 2991-102-1, PAU 3040-3-4-4, PAU 3042-3- 3-4, PAU 3075-20-3, PAU 3110-37-1-1-1, PAU 3111-45-1, PAU 3116-7-8-1, PAU 3127-143-2-1, PR 106-P2, PR 106- P9, PR 116, PR 118, RP Bio 170, RP Bio 226, SS 1113, Tainjung 72 and three NILs namely, IRBB 58 (Xa4 + xa13 + Xa21), IRBB 59 (xa5 + xa13 + Xa21) and IRBB 60 (Xa4 + xa5 + xa13 + Xa21) were found consistently resistant to bacterial blight caused by Xanthomonas oryzae pv. oryzae (Xoo). Among various botanicals and non-conventional chemicals evaluated, foliar application of dimethyl sulphoxide, crude extract of Pilkhan (Ficus infectoria) fruits, Aonla (Emblica officinalis) leaves and soil application of probenazole reduced the disease severity by 30-35 per cent. However, maximum disease control (54.4%) along with a significant increase in grain yield were provided by a combination treatment of single spray of 2,4-D ethyl ester (1.0 ml/l) and two sprays of Streptocycline (200 mg/l) + copper oxychloride (2.5 g/l) followed by a combination of nickel nitrate and maleic acid.

2015

International Journal of Current Microbiology and Applied Sciences, 2017