Pea seed treatment for Rhizoctonia solani control

Mojumdar

Letters in Applied Microbiology

et al. 2022

Significance and Impact of the Study: This study focuses on the antifungal activity of novel Streptomyces chilikensis RC1830 and its application in the biocontrol of wilt diseases of rice seedlings by Fusarium oxysporum through soil application. Application of microbial cultures directly onto the agricultural sector as a biofertilizer is not so beneficial, so the strain RC1830 were formulated with several carrier materials for the production of portable and convenient form. The strain could be a potential development strategy as biofertilizer for economically important crops. A new whole-cell microbe-based bioformulation for plant growth promotion with antifungal properties was formulated with a shelf life of 3 months. Keywords antagonistic activity, plant growth-promoting traits, powder formulation, Streptomyces chilikensis, wilt disease of rice.

Section: Efficacy Of the Viable Sporessupporting

confidence: 93%

“…These findings are in consistent with previous research that has emphasized the benefits of formulated bio‐pesticides focused on spore‐producing bacteria in promoting plant growth and development (da Silva et al . 2013; Goudjal et al . 2014; Mendoza 2016).…”

Section: Resultsmentioning

confidence: 99%

Biocontrol of wilt disease of rice seedlings incited by Fusarium oxysporum through soil application of Streptomyces chilikensis RC1830

Mojumdar

Letters in Applied Microbiology

et al. 2022

“…On the other hand, Aveling, Govender, Kandolo and Kritzinger (2012) and Vazquez, Cardoso and Peres (2014) found that corn seeds treated with fungicides and insecticides showed no difference in the electrolyte leakage compared to untreated seeds. Similar results have been found by other authors when evaluating pea seeds with fungicides (Silva, Freitas, & Nascimento, 2013) and soybean seeds treated with fungicides and insecticides (Costa, Nunes, Ventura, Arantes, & Mendes, 2018).…”

Section: Introductionsupporting

confidence: 91%

Electrical conductivity test in the evaluation of the physiological potential of treated and stored soybean seeds

Couto

Brzezinski

Abati

et al. 2021

Semina: Ciênc. Agrár.

Soybean seed treatment contributes to the maintenance of seed quality, but the effect of commercial formulations and chemical products on the effectiveness of the electrical conductivity test based on electrolyte leaching has been frequently questioned. This study aimed to verify the interference of the chemical seed treatment of two soybean cultivars on the effectiveness of the electrical conductivity test in evaluating the vigor of freshly treated and stored seeds. The experimental design was completely randomized, consisting of seven seed treatments and two evaluation periods (0 and 60 days after storage), with four replications. The used seed treatments consisted of 1) fipronil + pyraclostrobin + thiophanate-methyl, 2) imidacloprid + thiodicarb + carbendazim + thiram, 3) abamectin + thiamethoxan + fludioxonil + mefenoxam + thiabendazole, 4) carbendazim + thiram, 5) fludioxonil + mefenoxam + thiabendazole, 6) carboxin + thiram, and 7) control (no treatment). The cultivars were BRS 360 RR and BRS 284, which were analyzed separately. Germination, accelerated aging, emergence, and electrical conductivity tests were carried out. No differences were detected between the control and chemical treatments performed on seeds of the two freshly treated soybean cultivars regarding germination, accelerated aging, and emergence tests. The germination test stood out after storage with the cultivar BRS 360 RR, showing the maintenance of germination potential for seeds treated with carbendazim + thiram and the control treatment. Therefore, the chemical treatment of soybean seeds interferes with the result of the electrical conductivity test. The electrical conductivity test is effective in segregating seed lots in terms of vigor level. The electrical conductivity test correlates with the other vigor tests used to identify the reduction in the physiological seed quality with storage.

“…Another part of the increase in Rhizoctonia-like symptoms can be explained by changes in seed treatment and foliar sprays. The active substance iprodione, with well-studied effect against R. solani in many different crops, has been one of the standard fungicides for carrot seed treatment and for tuber treatment in potatoes, for many years [42][43][44][45][46]. Tuber treatment with iprodione has been banned in Sweden since 2010, but the seed treatment in carrots was available until 2018 through imported carrot seeds [47,48].…”

Section: Discussionmentioning

confidence: 99%

Occurrence and Anastomosis Grouping of Rhizoctonia spp. Inducing Black Scurf and Greyish-White Felt-Like Mycelium on Carrot in Sweden

Marcou

Wikström²,

Ragnarsson

et al. 2021

JoF

Carrots with different Rhizoctonia-like symptoms were found in the main Swedish carrot production areas from 2001–2020. The most commonly observed symptoms were a greyish-white felt-like mycelium and black scurf, the latter often associated with Rhizoctonia solani anastomosis group (AG) 3-PT on potato. An overall increase in disease incidence in all studied fields over time was observed for both symptoms. The majority of Rhizoctonia isolates sampled from carrot in the period 2015–2020 were identified as AG 3 (45%) and AG 5 (24%), followed by AG 1-IB (13%), AG 11 (5%), AG-E (5%), AG BI (3%), AG-K (3%) and AG 4-HGII (2%). To our knowledge, this is the first report describing AG 5 in Sweden as well as AG 3, AG 11 and AG-E inducing Rhizoctonia-like symptoms on carrot. Secondly, we report for the first time that R. solani AG 3, and the less observed AGs: AG 1-IB and AG 5 can induce black scurf symptoms on the taproot of carrots. Due to a widely used carrot-potato crop rotation in Swedish areas, a possible cross-over from potato to carrot is suggested. This information is of high importance to reduce Rhizoctonia inoculum in soils, since avoiding carrot-potato crop rotations needs to be considered.