Effect of temperature on the phenology of Chilo partellus (Swinhoe) (Lepidoptera, Crambidae); simulation and visualization of the potential future distribution of C. partellus in Africa under warmer temperatures through the development of life-table parameters – CORRIGENDUM

Rhyncaphytoptus ficifoliae Keifer (Trombidiformes; Diptilomiopidae) is one of the important pests of fig trees that is widely distributed in fig orchards located in south-western Iran. The effect of six ambient temperatures (17, 20, 25, 30, 33 and 36°C) on life table parameters of R. ficifoliae was studied under laboratory conditions at 60±5% relative humidity and a photoperiod of 16: 8 h (L: D) on fig leaves. The life table parameters were estimated according to the age-stage, two-sex life table theory. In addition, the bootstrap technique was used for estimating the variances and standard errors of the population parameters. R. ficifoliae successfully developed and reproduced from 17 to 33°C, but the females reared at 36ºC laid a few eggs and died after several days. The longest and shortest total longevity of females were recorded at 25°C (48.50 days) and 33°C (14.33 days), respectively. The fecundity increased as temperature increased from 11.04 eggs at 17°C to 25.04 eggs at 25°C, then decreased and reached 12.44 eggs at 33°C. The lowest and highest values of the intrinsic rate of increase (r) were 0.043 and 0.234 day-1 that obtained at 17 and 30°C, respectively. The mean generation time (T) significantly decreased from 33.39 days to 9.63 days with increasing temperature from 17°C to 33°C. Our findings show that females reared at higher temperatures (>25°C) exhibit greater overall reproduction rates in comparison to lower temperatures.

Download Full-text

Effect of temperature on the phenology ofChilo partellus(Swinhoe) (Lepidoptera, Crambidae); simulation and visualization of the potential future distribution ofC. partellusin Africa under warmer temperatures through the development of life-table parameters

Bulletin of Entomological Research ◽

10.1017/s0007485314000601 ◽

2014 ◽

Vol 104 (6) ◽

pp. 809-822 ◽

Cited By ~ 40

Author(s):

N. Khadioli ◽

Z.E.H. Tonnang ◽

E. Muchugu ◽

G. Ong'amo ◽

T. Achia ◽

...

Keyword(s):

Life Table ◽

Activity Index ◽

Model Development ◽

Growth Potential ◽

Geographical Information ◽

Effect Of Temperature ◽

System Component ◽

Change Scenario ◽

Life Table Parameters ◽

The Future

AbstractMaize (Zea mays) is a major staple food in Africa. However, maize production is severely reduced by damage caused by feeding lepidopteran pests. In East and Southern Africa,Chilo partellusis one of the most damaging cereal stem borers mainly found in the warmer lowland areas. In this study, it was hypothesized that the future distribution and abundance ofC. partellusmay be affected greatly by the current global warming. The temperature-dependent population growth potential ofC. partelluswas studied on artificial diet under laboratory conditions at six constant temperatures (15, 18, 20, 25, 28, 30, 32 and 35 °C), relative humidity of 75±5% and a photoperiod of L12:L12 h. Several non-linear models were fitted to the data to model development time, mortality and reproduction of the insect species. Cohort updating algorithm and rate summation approach were stochastically used for simulating age and stage structure populations and generate life-table parameters. For spatial analysis of the pest risk, three generic risk indices (index of establishment, generation number and activity index) were visualized in the geographical information system component of the advanced Insect Life Cycle modeling (ILCYM) software. To predict the future distribution ofC. partelluswe used the climate change scenario A1B obtained from WorldClim and CCAFS databases. The maps were compared with available data on the current distribution ofC. partellusin Kenya. The results show that the development times of the different stages decreased with increasing temperatures ranging from 18 to 35 °C; at the extreme temperatures, 15 and 38 °C, no egg could hatch and no larvae completed development. The study concludes thatC. partellusmay potentially expands its range into higher altitude areas, highland tropics and moist transitional regions, with the highest maize potential where the species has not been recorded yet. This has serious implication in terms of food security since these areas produce approximately 80% of the total maize in East Africa.

Download Full-text