Management of Soilborne Diseases in Crop Plants: An Overview

Soilborne diseases are very critical in realizing the yield potential of improved cultivars in several agricultural crops. Often these diseases are very difficult to manage due to their highly heterogeneous incidence and lack of knowledge on the epidemiological aspects of soilborne pathogens. Soilborne diseases of ancient and modern agricultural crops have always had some impact on growth and productivity. Observations and experience passed down through generations gave rise to cultural practices that reduced or minimized the losses to soilborne and above ground diseases, but it was probably rare that anyone in agriculture claimed to “control” the diseases. The expansion in the crop diversity in agriculture has required parallel expansion of strategies to minimize the soilborne diseases. The effective control of the soilborne diseases is possible only through detailed study on survival, dissemination of soilborne pathogens; effect of environmental conditions role of cultural practices and host resistance and susceptibility will play a major role in disease management

Pathogenic and Molecular Variability of Aspergillus niger Isolates Causing Collar Rot Disease in Groundnut

Pathogenic variability studies of 26 isolates of collar rot pathogen (Aspergillus niger) of groundnut collected from different districts of Telangana and Andhra Pradesh states were conducted under greenhouse conditions by using two groundnut cultivars TMV-2 and JL-24. The mean seedling mortality ranged from 29.7 per cent (MBNRAn-1 (Palkapally)) to 94.4 per cent (ATPAn-1 (Jogannapet)). All the isolates of A. niger showed differential reaction with regard to seedling mortality on JL-24 and TMV-2 cultivars. Similarly genetic relatedness among eight virulent isolates (two isolates from each district) of A. niger from groundnut was assessed by using RAPD analysis. The similarity index values among the A. niger isolates varied from 0.571 (between WGL An-2 and CHT An-3) to 0.229 (between MBNR An-3 and WGL An-2)

Resistance Screening of Groundnut Advanced Breeding Lines against Collar Rot and Stem Rot Pathogens

Forty groundnut advanced breeding lines along with susceptible checks JL-24, J-11 and TMV-2 were used for collar rot (Aspergillus niger) and stem rot (Sclerotium rolfsii) disease screening. Based on the per cent number of plants affected by the collar rot pathogen, the advanced breeding lines were categorized into four groups. The lines present in group I (Resistant) having < 15% incidence, group II (Moderately resistant) having 15.1 to 30%, group III (Susceptible) having 30.1 to 45 % and group IV (Highly susceptible) having > 45% incidence. Similarly among 40 breeding lines only three lines (ICGV86699, ICGV91114 and ICGV 89280) have shown stem rot disease reaction below 3 (up to 25 % plants were symptomatic) and considered to be moderately resistant to stem rot pathogen. The advanced breeding line ICGV99058 has recorded a disease reaction of 5 scale (> 50 % of the plants symptomatic) equal to the susceptible checks which is considered to be highly susceptible to stem rot pathogen

MANAGEMENT OF SOILBORNE DISEASES IN CROP PLANTS: AN OVERVIEW

ABSTRACT: Soilborne diseases are very critical in realizing the yield potential of improved cultivars in several agricultural crops. Often these diseases are very difficult to manage due to their highly heterogeneous incidence and lack of knowledge on the epidemiological aspects of soilborne pathogens. Soilborne diseases of ancient and modern agricultural crops have always had some impact on growth and productivity. Observations and experience passed down through generations gave rise to cultural practices that reduced or minimized the losses to soilborne and above ground diseases, but it was probably rare that anyone in agriculture claimed to &quot;control&quot; the diseases. The expansion in the crop diversity in agriculture has required parallel expansion of strategies to minimize the soilborne diseases. The effective control of the soilborne diseases is possible only through detailed study on survival, dissemination of soilborne pathogens; effect of environmental conditions role of cultural practices and host resistance and susceptibility will play a major role in disease management

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Not AvailableCastor is an important non-edible oilseed crop having huge industrial and export potential. It is used as an efficient lubricant for high-speed engines and as an ingredient in several commodities. There is a critical need to identify or to improve the germplasm lines with desirable characters. In the present study, 82 germplasm lines were evaluated in augmented design to estimate the genetic parameters viz., PCV, GCV, heritability and genetic advance as per cent of mean, principal component analysis and correlation studies. Results showed that the difference between PCV and GCV was low indicating less impact of environment on trait expression. Heritability (broad sense) and genetic advance as per cent of mean values were high for all the traits thus role of additive gene action is found important in governing the traits. Cluster analysis studies revealed that all the genotypes were grouped into eight clusters and cluster VIII documented the highest mean values for hundred seed weight and plant yield. The entries PRC-2 and PCS-337 recorded higher hundred seed weights of 56.5 and 48.6 g, respectively and in turn higher yield. These lines can be utilized as parents in the hybrid development programme for yield improvement. Correlation studies revealed that plant yield showed a significant positive association with all the characters except for days to 50% flowering. Thus selection for these traits viz., primary spike length, effective primary spike length, the number of effective spikes per plant, the number of capsules per spike and hundred seed weight will be advantageous in attaining higher yields.Not Availabl

Preparation, characterization, in vitro drug release and biological studies of curcumin loaded dextran sulphate–chitosan nanoparticles

Nanoformulation of curcumin, (a low molecular weight hydrophobic drug) was prepared by using dextran sulphate and chitosan. The developed nanoparticles were characterized by Dynamic Light Scattering measurements (DLS), Scanning Electron Microscopy (SEM), Atomic Force Microscopy (AFM), Fourier Transform Infrared Spectroscopy (FT-IR), X-ray Diffraction (XRD) and Differential Thermal Analysis (DTA). The prepared system showed an average size of 200-220 nm with a zeta potential value of -30 mV and showed ∼74% drug entrapment efficiency. In vitro drug release studies showed a controlled and pH dependent curcumin release over a period of one week. The cytocompatibility of bare nanoparticles was verified by MTT assay; cellular internalisation of curcumin loaded nanoparticles was confirmed by fluorescent imaging and quantified spectrophotometrically, anticancer activity of curcumin loaded nanoparticles was proved by MTT assay and reconfirmed by apoptosis assay (FACS). The results showed preferential killing of cancer cells compared to normal cells by the curcumin-loaded nanoparticles. Thus the developed curcumin loaded nanoformulation could be a promising candidate in cancer therapy

Efficacy of Newer Insecticides against the Major Sucking Pests of Groundnut (Arachis hypogea L.)

The field experiments on the efficacy of newer insecticides on sucking insect pests of groundnut was conducted at Regional Agricultural Research Station, Palem, of Nagarkurnool district, Telangana, India during rabi, 2021-22 in a randomized block design with eight treatments viz., Tolfenpyard 15% EC at 1.5ml L-1 and Tolfenpyard&nbsp; 15% EC at 2 ml L-1, Tolfenpyard 15% EC at 2.5ml L-1, Spinetoram 11.7%&nbsp; SC at 0.5ml L-1, Thiamethoxam 12.6+ Lambdacyhalothrin 9.5% ZC at 0.4ml L-1, Clothianidin 50% WDG at 0.3g L-1, Afidopyropen 50g/IDC at 2ml L-1 and Sulfoxaflor 21.89% SC at 0.5ml L-1. Among all the insecticides tested clothianidin @ 0.3g L-1 worked very effectively in reducing the population of leafhoppers and thrips. The other effective treatments were afidopyropen at 2ml L-1 and tolfenpyard @ 2.5ml L-1 followed by tolfenpyard 15 %EC at 2.5ml L-1, tolfenpyard at 2.5ml L-1, thiamethoxam+ lambdacyhalothrin at 0.4ml L-1. The treatment spinetoram at 0.5ml L-1 was less effective on the sucking pest. The highest Incremental Cost Benefit Ratio (ICBR) is recorded from the plots sprayed with clothianidin @ 0.3g L-1 (1.4.83) followed by afidopyrofen @ 2ml L-1 (1:3.94)

Population Dynamics of Defoliator Pests of (Arachis hypogea L.) in Different Staggered Sowings

The present study was conducted to assess the incidence of defoliator pests of groundnut in three different staggered sowings. The experiment was laid with three treatments and seven replications which was carried out at RARS (Regional Agricultural Research Station), Palem, Nagarkurnool district, Telangana state which is having hot and dry climate.&nbsp; The data has been correlated with various weather parameters, including Maximum temperature, Maximum temperature, RH-I and RH-II. The variety K-6 was grown in three staggered sowings (D1: 1st Oct; D2: 15th Oct; D3: 1st Nov). There was a less population of leaf miner during D1 the correlation studies revealed that tobacco caterpillar showed a non-significant negative correlation with the Tmax ºC (r= -0.233) and a significant positive correlation with Tmin ºC (r= 0.370) and RH-Ⅱ (r=0.640). whereas gram caterpillar showed a positive significant correlation to Tmax (r= 0.256) and Tmin (r= 0.097) and a negative significant correlation towards RH-Ⅰ (r= -0.186) and RH-Ⅱ (r= -0.501)