ABSTRACT
The aim of this work was to construct life table of Bemisia tabaci (Gen.) A and B (silverleaf whitefly B. argentifolii Bellows and Perring) biotype (Hem.: Aleyrodidae) on two host plants; cotton, (Gossypium hirsutum L.) and rapeseed, (Brassica napus L.). Experiments were conducted in a growth chamber under 24 ± 2ºC, 55±3% RH and 16:8 (L:D) h photoperiod on caged plants of cotton G. hirsutum L. (Varamin 76 variety) and rapeseed B. napus L. (global variety. The intrinsic rate of natural increase (r m), net reproductive rate (R0) and mean generation time (T) for B. tabaci A biotype was 0.1010 females per female per day, 18.4075 females per female and 30.079 day (d) on cotton; 0.1286, 30.6760 and 26.77 d on rapeseed; and for B biotype (B. argentifolii) those above respective parameters averaged 0.1033, 27.8426 and 32.74 d on cotton and 0.1750, 40.75 and 21.27 d on rapeseed. The total survival of A and B biotype from the egg to adult on cotton was 22.08 and 22.25, respectively. The results showed significant differences between the two biotype reared on either host plant for gross reproductive rate (GRR), net reproductive rate (R0 or NRR), intrinsic rates of increase (r m), finite rate of increase (λ), doubling time (DT) and mean generation times (Tc). To obtain a better understanding of the biology of these biotypes, Stable age distribution (Cx) and some other aspects of life history related to their hosts were also studied. Based upon the results, both biotypes showed a greater reproduction capacity on rapeseed than on cotton. Thus, rapeseed was more suitable host than cotton for two biotypes and this was an important factor in host plant selection for optimizing the control strategies of these major pests.
ABSTRACT
Diabetes Mellitus account for over 8% of all pregnancies and is associated with increased risk of complications of pregnancy, and prenatal mortality. This study was conducted to determine the disadvantages of gestational diabetes on mother and her baby, in order to prevent neonatal and marital unpleasant outcomes. The present historical cohort study includes 420 mothers referred to Shiraz hospitals in 2006. Seventy cases with diabetes and 350 were controls. Data was collected by questionnaire and analyzed by t-test and fisher exact tests in SPSS v.13 software. The recurrence rate of gestational diabetes was 72.4%. There was a significant difference between the two groups in still birth [RR= 8.87], macrosommia [RR= 7.38], respiratory distress [RR= 5.16], hypoglycemia [RR= 13.38], neonatal jaundice [RR= 3.28], need for respiratory support [RR= 3.17], congenital anomalies [RR= 7.28] and cesarean delivery [RR= 1.96] [p<0.05]. However it did not show any significant difference in intra uterine growth retardation [IUGR], shoulder dystocia, breech labor, need for insulin, meconium problems, induction of labor, episiotomy and placenta disorders [P>0.05]. Stillbirth, macrosomia, respiratory distress, hypoglycemia and neonatal jaundice are more common in women with gestational diabetes. Hence in view of the unfavourable outcome, preventive measures and control of diabetes are essential