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ROLE OF NUTRIENT MANAGEMENT AND BIOPESTICIDE ON INCIDENCE OF EARIAS VITELLA FAB IN OKRA

KrishiKosh

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Title ROLE OF NUTRIENT MANAGEMENT AND BIOPESTICIDE ON INCIDENCE OF EARIAS VITELLA FAB IN OKRA
 
Creator KARMARKAR, MAKARAND S.
 
Contributor PATEL, K.A.
 
Subject fruits, pesticides, vegetables, inorganic acid salts, biological interaction, animal developmental stages, land resources, yields, biological phenomena, insecticides
 
Description The field experiments to study role of nutrient management and biopesicide on incidence of Earias vitella Fab. were carried out at Agriculture Research Farm, N. M. College of Agriculture, Navsari during summer seasons of 2011-12 and 2012-13. Whereas some biological aspects of host plant nutrition and biopesticide were studied in the Department of Agricultural Entomology, N. M. College of Agriculture, Navsari.
In a study on effect of organic manures and fertilizers on insect pests, lowest shoot infestation was recorded in T11 (4.48%) where double dose of K was applied remained at par to T2 (vermicompost), T1 (FYM), T3 (Biocompost), T8 (50%RDF+vermcompost), T9 (50%RDF+Biocompost) and T7 (50%RDF+FYM) in which only organic manures and 50 per cent of the recommended fertilizers were applied. The treatment T10 (Double N+ Recommended P&K) was the least effective treatment as it recorded highest shoot infestation (10.94%) in which double N was applied.
Per cent fruit infestation on weight and number basis was more (34.40 and 32.75%, respectively) in the treatment T10
wherein double dose of nitrogen was used. However, it was lowest in the treatment T11 (50%N + Recommended P + Double K) (15.75 and 15.47 %).
The population of adult whiteflies was significantly more (6.05/leaf) in treatment T10 where double N was used. Whereas, the lowest population was recorded in T2, T8 and T11.
Significantly the highest jassid population (6.43/leaf) was found in the treatment of T10 followed by T12 and T4 and lowest population in treatment T11 (2.45/leaf). Significantly lowest aphid count (4.83/leaf) was recorded in treatment T11 where double dose of K was applied. In the treatment with double N (T10) highest aphid population (10.67/leaf) was recorded.
Maximum eggs were observed (194 eggs) on plants receiving double dose of N (T10). However, comparatively less number of eggs were recorded in treatments T2 (80 eggs) and T8 (95.5 eggs).
There was not much more variation in larval period. The maximum average period was 14.86 days in T11, whereas minimum average period was recorded in treatment T10 (12.75 days). In case of pupal period, it varied from 8 to 10 days with an average of 8.14 to 8.57 days.
Highest growth index (4.71) was recorded in treatment T10 than recommended dose indicating most suitable for growth and development, whereas T11 was least suitable as recorded the lowest growth index (2.36).
Maximum marketable yield of 10.16 t/ha and net realization of Rs. 94,999/- was obtained in T10 showing superiority
over all other treatments. Whereas, treatment T11 recorded 10.13 t/ha marketable yield with net realization of Rs.95, 293/- per hectare.
The nitrogen content was significantly more (3.20%) in treatment T10 where double nitrogen was applied and in remaining treatment it ranged from 2.40 to 2.95 per cent, while the phosphorus content in fruits of various nutritional treatments ranged between 0.55 to 0.60 per cent without any clear indication of the treatment effect. The potassium content was significantly more (2.90%) in treatment T11 where double dose of potassium was applied.
Relative susceptibly of different instars to Bt. under laboratory condition recorded highest mortality in first instar (100.00 %), followed by second (98.00%), third (88.00%) and fourth instar (80.00%).
Laboratory efficacy of Btk and insecticides indicated that cent per cent larval mortality was obtained in treatments with insecticides one day after treatment. Mortality in the treatment of Btk 0.3, Btk 0.2 and Btk 0.1 per cent increased from 52.33 to 83.33, 23.33 to 76.67 and 16.67 to 73.33 per cent respectively from second to fourth day of feeding.
Results with Btk and insecticides under field condition revealed that treatments with Btk 0.2 per cent plus emamectin benzoate 0.002 per cent and Btk 0.2 per cent plus fenvalerate 0.01 per cent were the most effective treatments with 8.21 and 9.98 per cent mean fruit infestation, respectively. These two treatments also recorded the highest marketable yield of okra 13.53 and 12.29 t/ha.
Highest percentage increase in yield over control was recorded in treatment of Btk 0.2 per cent plus emamectin benzoate
0.002 per cent (82.10) and Btk 0.2 per cent plus fenvalerate 0.01 per cent (65.41) with highest ICBR of 1:9.78 and 1:7.52, respectively. Among the various doses of Btk, Btk 0.2 per cent recorded highest ICBR ratio of 1:3.63.
Highest net realization over control of Rs. 61,000/- was obtained in treatment of Btk 0.2 per cent plus emamectin benzoate 0.002 per cent followed by Btk 0.2 per cent plus fenvalerate 0.01 per cent (Rs. 48,600/-). Also treatment of Btk 2 per cent alone recorded higher net gain of Rs. 42,400/- .
Effect on bioagents indicated that the activity of natural enemies, Menochillus sexmaculatus L. and Chrysoperla zastrowi sillemi (Esben-Peterson) were found in the field. The population of both the predators was comparatively in good number in the treatments with Btk alone and also with Btk 0.2 per cent followed by emamectin benzoate 0.002 per cent and Btk 0.2 per cent followed by fenvalerate 0.01 per cent .
Evaluation of different organic and inorganic feeding stimulants indicated that all the organic and inorganic additives increased the efficacy of Btk but soyabean flour 2 per cent and sodium chloride 1 per cent found comparatively best. The borax 1 per cent also increased efficiency of Btk 0.2 per cent but to lower extent.
 
Date 2016-05-05T11:21:23Z
2016-05-05T11:21:23Z
2014-04
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/65796
 
Language en
 
Format application/pdf
 
Publisher Navsari Agricultural University, Navsari