Studies on the Effect of Different Dates of Pruning on Growth Yield and Fruit quality of Guava Under High Density Planting Cv. Allahabad Safeda
| dc.contributor.advisor | Singh, Jagdish | |
| dc.contributor.author | Pandey, Shalini | |
| dc.date.accessioned | 2016-08-27T13:50:25Z | |
| dc.date.available | 2016-08-27T13:50:25Z | |
| dc.date.issued | 2013 | |
| dc.description.abstract | ABSTRACT The present investigation entitled Studies on the seasonal incidence and eco-friendly management of onion thrips (Thrips tabaci L.) was conducted at Vegetable research farm , Maharajpur , Jawaharlal Nehru Krishi Viswavidyalaya Jabalpur, Madhya Pradesh during Rabi season of 2010-11. The experiment was laid out in Randomized block design with seven treatments and three replications .The treatments consisted of three botanicals(i.e.Neem crude oil, Pongamia crude oil and Dasparni ), to microbials (i.e. Bauvaria bassiana and spinosad ), a chemical check (Profenofos) and a control . All the recommended agronomical practices were followed to raise onion crop ( variety Agri-found light red) . Fertilizers were applied at the rate of 100:50:50:50 kg/ha of NPKS respectively Level of pest incidence was significantly high in field and the crop did not receive any insecticidal treatment till start of the treatment. The seasonal incidence of T. tabaci was studied by recording the thrips population per plant at weekly interval after transplantation till the harvest of the crop. The insect incidence was correlated with weather factors to understand the population dynamics. Efficacy of different botanicals and microbial insecticide against T. tabaci was evaluated using different treatment .Foliar application of pesticides on the crop was carried out five times at interval of 10 days. First pesticide application was done 30 days after transplanting. The sprayer was calibrated before use to regulate the quantity of spray solution as per requirement. Observations on thrips were recorded before and after each spray. there were seven mentioned treatments replicated thrice. Observations were taken one day before treatments (pre-treatment) on 5th and 10th days after each spray.The sampling unit for recording the thrips population was innermost leaves of per plant and 10 plant selected from each plot and replications . Mean thrips population under different treatments was subjected to the analysis of variance at 5% level of significance. The marketable yield from each treatment was recorded and analyzed using standard statistical procedure of variance at 5% level of significance. To know the most economical and effective insecticides for the management of thrips the cost of treatments were worked out us per prevailing market rates. The first appearance (1.60 thrips/plant) of T. tabaci on the onion crop was observed during 6th standerd metrological week (1st week of February) when the crop was 44 days old. During this period maximum and minimum temperature was 29.6 and 9.90 C, respectively. The relative humidity was 85% (morning) and 36% (evening). The sunshine, rainfall and number of rainy days were 9.5 hrs , 0.00 mm and 0 days respectively . After the initial low population,there was and increase (7.63 thrips/plant) up to 7th standard meteorological week (2nd week of February ). The peak population (42.33 thrips /plant) was noticed during 10th standard meteorological week (1st week of March) during this period maximum and the minimum temperature was 32.1 and 13.60C,respectively.The relative humidity 82% (morning) and 34% (evening). The sunshine, rainfall and number of rainy days were 8.8 hrs, 0.00 mm and 0 days respectively. When the crop was 72 days old the population began to decline (23.79 thrips/plant) in the 11th standard meteorological week (2nd week of march) when the crop was 79 days old. There was positive and significant correlation between onion thrips with maximum temperature (0 C) and rainy days. Mean of 10 observations had shown significantly difference with respect to nymphs and adult population of thrips under different insecticidal treatments. All the treatments were found to be statistically superior to untreated control (30.13 thrips/plant). However among all the treatments, lowest thrips population (1.78 thrips/plant) was recorded in Spinosad 4.5 ml/litre of water, followed by Profenofos 2 ml/litre of water with 3.77 thrips/plant. Neem crude oil 40 ml/litre of water was next better treatment having 5.85 thrips/plant. Pongamia crude oil, Dasparni and B. bassiana were less effective for controlling of thrips with 13.73, 15.19 and 15.70 thrips/plant. Highest cost benefit ratio 1:5.70 was recorded in the treatment of Spinosad 4.5 ml/litre of water. Application of Profenofos 2 ml/litre of water registered the cost benefit ratio 1:3.43, the cost of benefit ratio in remaining treatments are 1:2.25, 1:1.48, 1:1,44 and 1:1.06 and hence these treatments proved less economical. | en_US |
| dc.identifier.uri | http://krishikosh.egranth.ac.in/handle/1/74107 | |
| dc.language.iso | en | en_US |
| dc.publisher | JNKVV | en_US |
| dc.sub | Horticulture | |
| dc.these.type | M.Sc | |
| dc.title | Studies on the Effect of Different Dates of Pruning on Growth Yield and Fruit quality of Guava Under High Density Planting Cv. Allahabad Safeda | en_US |
| dc.type | Thesis | en_US |