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EVALUATION OF OIL BASED FORMULATIONS OF Nomuraea rileyi (FARLOW) SAMSON AGAINST Spodoptera litura IN GROUNDNUT

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Title EVALUATION OF OIL BASED FORMULATIONS OF Nomuraea rileyi (FARLOW) SAMSON AGAINST Spodoptera litura IN GROUNDNUT
 
Creator TELUGU SHARMILA
 
Contributor MANJULA, K
 
Subject oils, plant oils, animal developmental stages, biological phenomena, fungi, groundnuts, concentrates, land resources, coconuts, rice
 
Description The Nomuraea rileyi was mass produced on broken rice media. The spore dust obtained was mixed @ one gram per 10 ml of autoclaved oils (i.e., sunflower, groundnut and coconut oils). These oil formulations prepared freshly were used further in field and laboratory studies.
In the laboratory evaluation against third instar S. litura, mean larval mortalities of 96.67, 93.33, 86.67 and 76.67 per cent respectively were recorded with groundnut, sunflower, coconut oil based formulations and crude formulation of N. rileyi at highest concentration i.e., 1 x 108 spores ml-1 at 10 DAT. More than 70 per cent larval mortalities of S. litura were obtained with the concentrations above 1 x 106 spores per ml in case of groundnut oil and sunflower oil based formulations. The mortalities gradually reduced with concentration showing the least at 1 x 102 spores ml-1. Incubation period, was in negative correlation with the concentration of N. rileyi in all the formulations. Rate of pupation and normal adult emergence were positively associated with concentration whereas, pupal mortalities and malformed adults emergence showed positive association with concentration of N. rileyi against S. litura larvae.
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LC50 and LC90 values of N. rileyi were lower with oil mixed application than applying the fungus as crude suspension. Among the oils, the lowest LC50 (0.3 x 104 spores ml-1) and LC90 (1.2 x 107 spores ml-1) were obtained with groundnut oil formulation. Lower LT50 of 3.93 days was obtained with groundnut oil formulation at 1 x 108 spores ml-1 concentration. The LT50 values recorded with sunflower oil, coconut oil and crude formulations are 4.81, 5.28 and 5.93 days respectively at higher concentration (1 x 108 spores ml-1). LT50 values were higher at lower concentrations.
In groundnut crop ecosystem, along with three oil formulations, two WP (corn flour and talc) and one crude formulation were evaluated against S. litura and H. armigera. The results indicated that groundnut oil based formulation of N. rileyi recorded significantly higher reduction of both S. litura (82.46%) and H. armigera (74.58%) larval population. The groundnut oil based formulation also recorded significantly lower per cent leaf damage by both S. litura (14.27%) and H. armigera (13.27%). However sunflower oil and coconut oil formulations also proved better than WP and crude formulations.
Crude formulation was also found to be effective when compared to WP formulations in reducing the larval population, in recording lower per cent leaves damaged at 15 DAT against both pests.
 
Date 2016-06-16T15:32:55Z
2016-06-16T15:32:55Z
2012
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/67490
 
Language en
 
Relation D9349;
 
Format application/pdf
 
Publisher ACHARYA N.G. RANGA AGRICULTURAL UNIVERSITY