Please use this identifier to cite or link to this item: http://krishikosh.egranth.ac.in/handle/1/5810051196
Authors: Sanjekar, Manisha Babasaheb
Advisor: Nalwandikar, P. K.
Title: Biology and life-fecundity tables of rice moth corcyra cephalonica (Stainton) on sorghum at different temperature levels
Publisher: Vasantrao Naik Marathwada Krishi Vidyapeeth, Parbhani
Language: en
Type: Thesis
Pages: 137
Agrotags: null
Keywords: Larva pupated, Larval instar, Incubation, Pre-Pupal, Corcyra cephalonica
Abstract: The significantly shortest incubation period (2.67 days) of C. cephalonica was observed 35° C temperature. The significantly lowest egg hatching (93.40 per cent), growth index (1.19) was observed at 35° € and 20° C temperatures, respectively. The significantly longer larval duration of C. cephalonica (52.33 days) was noticed at 20° C temperature. The minimum instar duration (6.50 days) observed at 35° C temperature and maximum at 20° C temperature (8.72 days). The significantly lowest per cent pupation (62.38 per cent) was found at 20° C temperature however, the highest percentage pupation (83.63 per cent) was noticed at 35° C which was at par with the percentage pupation recorded at 30° C temperature (82.54 per cent). The significantly longer life-cycle duration of male (70.08 days), female (72.20 days) and in general (71.13 days) was recorded at 20° C temperature. The significantly lowest life-cycle duration in male (50.20 days), female (50.20 days) and in general (50.38 days) were recorded at 35° C temperature. The significantly lowest adult emergence (69.00 per cent) was noticed at 20° C temperature and highest at 30° C (87.41 per cent). In general, highest adult longevity was observed at 20° C temperature and shortest (11.34 days) at 35° C temperature. The numerically lower fecundity (190.60 eggs) was observed at 20° C temperature and highest (250.55 eggs) at 35° C temperature. The observed progression factors for larval head capsule width, body length, body width and body weight at 20° C temperature were 1.05,1.25,0.97, and 1.32, respectively. The .corresponding values at 25° C, 30° C and 35° C temperature were (1.16, 1.40, 0.99 and 1.38), (1.23,1.38,0.99, and 1.37) and (1.16,1.25,0.99 and 1.48), respectively. The C. cephalonica when reared at different temperatures viz., 20° C , 25° C , 30° C , 35° C recorded the survival of immature stages (lx) to the extent of 0.33, 0.43, 0.58 and 0.79 within a pivotal age of 70, 65, 60 and 53 days, the net reproductive rate (Rq) to the tune of 31.47, 46.98, 62.02 and 57.45 females per female per generation, the mean length of generation time (T) to the extent of 75.90, 71.86, 66.79 and 60.03 days, innate capacity for increase in numbers (0 to the tune of 0.046, 0.056, 0.064 and 0.07 female per female per day and finite rate of increase in numbers to the extent of (X) 1.11,1.13,1.15 and 1.17 females per female, respectively. On reaching stable age-distribution the population of C. cephalonica reared at 20° C temperature in egg, larval, pupal and adult stages contributed to the extent of 63.09,36.80, 0.085 and 0.005 per cent, respectively. The corresponding figures for 25° C, 30° C and 35° C temperatures were (57.43, 42.40, 0.14 and 0.020), and (50.50, 49.25, 0.21and 0.020) and (44.41,55.29,0.20 and 0.09) per cent, respectively. On the basis of overall suitability of different temperatures indicated that 30° C most suitable for growth and multiplication of C. cephalonica while, 20° C temperature was observed to be less suitable for the the development of C. cephalonica.
Subject: Agricultural Entomology
Theme: AGRICULTURE
These Type: M.Sc
Issue Date: 2016-05-30
Appears in Collections:Thesis

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