Chilo tumidicostalis

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Life tables of Chilo tumidicostalis (Hampson) Both biological and partial ecological life tables of C. tumidicostalis was investigated. Biological life table By proper planning and regular observation on the life history of sugarcane moth borers, it was possible to obtain data for construction of a biological life table. From the construction of biological life table of sugarcane moth borers, the biological attributes obtained from the investigation were the net reproductive rate of increase (Ro), the capacity for increase (rc ), the finite rate of increase (λ) and the cohort generation time (Tc). The net reproductive rate of increase (Ro) was the multiplication per generation. It was expressed as the ratio of total female births in two successive generations. The capacity for increase (rc) was an approximated value of the innate capacity for increase (rm), it was an instantaneous growth coefficient when the population was increasing in an unlimited environment. The finite rate of increase (λ) was the multiplication per female in unit of time and could be calculated from the approximated valve of the innate capacity for increase. The cohort generation time (Tc) was the mean time from birth of parents to birth of offspring biological life table dealing primarily with the female portion of the population and male were not included. The biological life table of C. tumidicostulis was illustrated in Table 8. The biological attributes calculated from the table were the net reproductive rate of increase (Ro) = 28.5128. The capacity for increase (rc ) = 0.0779, the finite rate of increase (λ) = 1.0821 and the cohort generation time (Tc) = 8.8897 days. It meaned that a population of C. tumidicostalis could multiply = 28.5128 times in each generation or it could multiply 1.0821 times in every three days. The biological attributes of C. tumidicostalis obtained from biological life table study was shown in Table 9. The eggs curve, designated by Laughlin (1965), was obtained by plotting lxmx against X. This curve represented the egg schedule of births and deaths in terms of the age-schedule fecundity and probability at birth of females being alive at each age group and the egg productivity within each age group through the life history. The egg curve of C. tumidicostalis as calculated from the biological life table was shown in Figure 11. It was obvious that the maximum productivity occurred during the first four days of an oviposition period. The productivity rapidly declined there after. 32
Table 8 Biological life table, age-specific fecundity rate and net reproductive rate Pivotal age in days (X) (Ro) of Chilo tumidicostalis (Hampson) under laboratory condition (28 ± 2 0 C and 75 ± 2 % RH) Proportion at birth 1/ of female being alive at age X (lxmx) Age-specific 2/ Fecundity (♀egg/♀ /X) (mx) Egg curve 3/ (lxmx) lxmx.X 0 1.0000 - - 3 1.0000 - - 6 0.9076 - - 9 0.7339 - - 12 0.6947 - - 15 Immature 18 stages 0.5966 0.5490 - - - - 21 0.4802 - - 24 0.4286 - - 27 0.3838 - - 30 0.3613 - - 33 0.3389 - - 36 0.3249 Preoviposition period 39 0.2941 5.6729 1.6703 65.1417 42 0.2717 67.3608 18.3019 768.6790 45 0.1905 32.5526 6.2013 279.0585 48 0.1765 13.2539 2.3393 112.2865 51 0.0812 - - - R0 = 28.5128 1/ lx = The probability of individual being alive at the beginning of the age-interval. 2/ mx = The number of female eggs of offsprings for each age-interval. 3/ lxmx = After Laughlin (1965) 33
Page 2: THESIS ECOLOGICAL STUDY OF THE SUGA
Page 5 and 6: TABLE OF CONTENTS TABLE OF CONTENTS
Page 7 and 8: (Hampson) with six larval instars
Page 9 and 10: LIST OF FIGURES (Continued) Figure
Page 11 and 12: ECOLOGICAL STUDY OF THE SUGARCANE M
Page 13 and 14: stated that the relative importance
Page 15 and 16: epeated mating habits, males mated
Page 17 and 18: MATERIALS AND METHODS Laboratory st
Page 19 and 20: the capsule of each larval instars
Page 21 and 22: Biological Studies of The Important
Page 23 and 24: RAINFALL (mm) RELATIVE HUMIDITY (%)
Page 25 and 26: Figure 3 Eggs mass of Chilo tumidic
Page 27 and 28: Table 1 Width of head capsule of Ch
Page 29 and 30: Table 3 Width of head capsule of Ch
Page 31 and 32: WIDTH OF HEAD CAPSULES (mm) 2.5 2 1
Page 33 and 34: WIDTH OF HEAD CAPSULES (mm) 3 2.5 2
Page 35 and 36: A B Figure 9 Pupae of Chilo tumidic
Page 37 and 38: Table 4 Body measurements of variou
Page 39 and 40: Table 5 Duration of various develop
Page 41: Table 7 Duration of various develop
Page 45 and 46: lxmx 20 15 10 5 0 33 36 39 42 45 48
Page 47 and 48: Table 10 Partial ecological life ta
Page 49 and 50: Survey Natural Enemies of Chilo tum
Page 51 and 52: Figure 14 The full grown larvae of
Page 53 and 54: Figure 15 Pupa of Cotesia flavipes
Page 55 and 56: Figure 17 Female adult of Cotesia f
Page 57 and 58: Duration of developmental periods T
Page 59 and 60: Figure 19 The female adult of Cotes
Page 61 and 62: Figure 20 Larvae of Tetrastichus sp
Page 63 and 64: Figure 22 The pupae of Tetrastichus
Page 65 and 66: Figure 24 Male adult of Tetrastichu
Page 67 and 68: Duration of developmental periods T
Page 69 and 70: Figure 26 The female of Tetrastichu
Page 71 and 72: Population Study of Chilo tumidicos
Page 73 and 74: POPULATION DENSITY (LOG N+1) 4.5 4
Page 75 and 76: PERCENT PARASITIZATION 50 45 40 35
Page 77 and 78: parasites; Telenomus sp. (Hymenopte
Page 79 and 80: and in control plot were 0, 0, 5.25
Page 81 and 82: Cantelo, W.W. and P. Pholboon. 1965
Page 83 and 84: Morris,R.F. and C.A. Miller. 1954.
Page 85: _____. 1999. Success of Cotesia fla

Chilo tumidicostalis

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