Srinivasan V.M.,Tamil Nadu Agricultural University |
Krishnamoorthy A.S.,Tamil Nadu Agricultural University |
Kuttalam S.,Center for Plant Protection Studies |
Kuttalam S.,Tamil Nadu Agricultural University |
And 3 more authors.
Pestology | Year: 2014
The bioefficacy of azoxystrobin was tested against late blight disease of potato caused by Phytophthora infestans (Mont.) de Bary. Field trials conducted for two seasons (2012-2013) revealed that the disease progression of potato late blight was successfully contended by azoxystrobin. Spraying of azoxystrobin at various doses (62.5,125.0,187.5 and 250.0 g a.i./ha) revealed that 250.0 g a.i./ha (1000 ml/ha) was found to be the optimum dose for the control of late blight disease of potato. The treatment also recorded the highest tuber yield of 29.25 and 28.15 tonnes / ha in the first and second season respectively. Studies to test the phytotoxic effect of azoxystrobin in the both the field trials revealed that the fungicide was not toxic to potato leaves.
Sudha R.,Central Agricultural Research Institute |
Balamohan T.N.,Horticultural College and Research Institute for Women |
Soorianathasundaram K.,Tamil Nadu Agricultural University |
Manivannan N.,Center for Plant Breeding and Genetics |
Rabindran R.,Center for Plant Protection Studies
Scientia Horticulturae | Year: 2013
The present investigations were undertaken to evaluate the F2 intergeneric population of Carica papaya (var. Pusa Nanha, CP 50 and CO 7) and Vasconcellea cauliflora for PRSV resistance. Investigations were also made to estimate the mean performance, genetic parameters governing different traits and reaction to the PRSV in the F2 population. Among the crosses, Pusa Nanha×V. cauliflora recorded superior mean performance for fruit yield, number of fruits per tree and fruit biochemical parameters than other two crosses in F2 generation. Mean performance for papain recovery per fruit and the enzyme activity were high in CP 50×V. cauliflora. Fruit quality parameters were high in CO 7×V. cauliflora. Desirable mean performance for days taken for disease after inoculation and disease intensity score were recorded by Pusa Nanha×V. cauliflora. Among the various characters studied, higher GCV, PCV, heritability and genetic advance as percent of mean were registered by the cross Pusa Nanha×V. cauliflora for all the morphological characters and fruit yield parameters. From the F2 population 24 plus trees were selected for further evaluation based on their performance viz., morphological, yield, quality and biochemical characters and reaction to PRSV. © 2013 Elsevier B.V.
Senthil R.,Center for Plant Protection Studies |
Selvaraj S.,Center for Plant Protection Studies |
Anand T.,Center for Plant Protection Studies |
Raguchander T.,Center for Plant Protection Studies |
Samiyappan R.,Tamil Nadu Agricultural University
International Sugar Journal | Year: 2011
Field trials in Tamil Nadu, India evaluated the control of sugarcane red rot with Pseudomonas fluorescens strain Pf1. Previous findings of our research group demonstrated that talc-based P. fluorescens (Pf1) formulation effectively reduced several plant diseases and promoted plant growth. Current agro-techniques require the development of a liquid formulation with a long viable shelf life. This paper reports on field experiments using different concentrations of liquid formulation of P. fluorescens (Pf1) in sugarcane fields. Biological control of red rot caused by Colletotrichum falcatum in vivo was obtained through liquid formulation of P. fluorescens (Pf1). The effective control of C. falcatum was obtained when the liquid formulation of Pf1 was applied at the rate of 4 litres/ha compared with the untreated control. Application of liquid based formulation of Pf1 resulted in significant decreased C. falcatum incidence in sugarcane and simultaneously decreased early shoot borer and leaf hopper, (Pyrilla perpusilla)) population in treated fields. When liquid formulation of Pf1 was applied through drip system, the Pf1 bacteria colonies were established in rhizosphere region and enhanced plant growth and yield of sugarcane.
Johnson I.,Center for Plant Protection Studies |
Ramjegathesh R.,Center for Plant Protection Studies |
Karthikeyan M.,Center for Plant Protection Studies |
Chidambaram P.,Central Institute for Cotton Research
Archives of Phytopathology and Plant Protection | Year: 2013
Grey (Areolate) mildew (Ramularia areola) and Alternaria blight (Alternaria macrospora) are two important fungal foliar diseases affecting cotton in India. Both the diseases are polycyclic in nature. The primary inoculum for grey mildew is through conidia or ascospores from infected debris and/or perennial cottons and the secondary spread is through primarily infected leaves. Whereas for Alternaria blight the spread is initially from seed-borne inoculum (in Gossypium herbaceum and Gossypium arboreum cottons) and/or crop debris and the secondary spread is from sporulating lesions on older leaves. Both R. areola and A. macrospora require a temperature regime of 20-30 °C with prolonged high humidity (>80%) and frequent rains for infection and disease development. However, it has been observed that cool weather coupled with prolonged dewy periods in the absence of rains has also been found conducive for the development of both the diseases. So, suitable epidemiological tools and models are required to predict the disease development, spread and to design suitable management practices. © 2013 Taylor & Francis.