The Area-Wide Spatio-Temporal Distribution of Ceratitis capitata (Wiedemann) (Diptera: Tephritidae) in a Heterogenous Fruit Production Region of the Western Cape, South Africa

2019 ◽  
Vol 27 (1) ◽  
pp. 97
Author(s):  
G.F.H.v.G. Bekker
Keyword(s):  
South Africa ◽  
Ceratitis Capitata ◽  
Temporal Distribution ◽  
Fruit Production ◽  
Western Cape ◽  
Production Region ◽  
Spatio Temporal

scholarly journals Comparative demography of Bactrocera dorsalis (Hendel) and Ceratitis capitata (Wiedemann) (Diptera: Tephritidae) on deciduous fruit

2019 ◽  
Vol 110 (2) ◽  
pp. 185-194
Author(s):  
Welma Pieterse ◽  
Aruna Manrakhan ◽  
John S. Terblanche ◽  
Pia Addison
Keyword(s):  
South Africa ◽  
Ceratitis Capitata ◽  
Prunus Persica ◽  
Reproductive Rate ◽  
Bactrocera Dorsalis ◽  
Population Increase ◽  
Western Cape ◽  
Net Reproductive Rate ◽  
Fruit Growing ◽  
Deciduous Fruit

AbstractBactrocera dorsalis (Hendel) and Ceratitis capitata (Wiedemann) are highly polyphagous fruit fly species and important pests of commercial fruit in regions of the world where they are present. In South Africa, B. dorsalis is now established in the north and northeastern parts of the country. B. dorsalis is currently absent in other parts of the country including the Western Cape Province which is an important area for the production of deciduous fruit. C. capitata is widespread in South Africa and is the dominant pest of deciduous fruit. The demographic parameters of B. dorsalis and C. capitata on four deciduous fruit types Prunus persica (L.) Batsch, Prunus domestica L., Malus domestica Borkh. and Pyrus communis L. were studied to aid in predicting the potential population establishment and growth of B. dorsalis in a deciduous fruit growing environment. All deciduous fruit types tested were suitable for population persistence of both B. dorsalis and C. capitata. Development was fastest and survival highest on nectarine for both species. B. dorsalis adults generally lived longer than those of C. capitata, irrespective of the fruit types that they developed from. B. dorsalis had a higher net reproductive rate (Ro) on all deciduous fruit tested compared to C. capitata. However, the intrinsic rate of population increase was estimated to be higher for C. capitata than for B. dorsalis on all fruit types tested primarily due to C. capitata's faster generation time. Provided abiotic conditions are optimal, B. dorsalis would be able to establish and grow in deciduous fruit growing areas.

scholarly journals Rainfall and river flow trends for the Western Cape Province, South Africa

2019 ◽  
Vol 115 (9/10) ◽  
Author(s):  
Rakhee Lakhraj-Govender ◽  
Stefan W. Grab
Keyword(s):  
Climate Change ◽  
South Africa ◽  
River Flow ◽  
Supply And Demand ◽  
Temporal Distribution ◽  
Annual Rainfall ◽  
Western Cape ◽  
Western Cape Province ◽  
Winter Rainfall ◽  
Intergovernmental Panel

Climate change has the potential to alter the spatio-temporal distribution of rainfall, subsequently affecting the supply and demand of water resources. In a water-stressed country such as South Africa, this effect has significant consequences. To this end, we investigated annual and winter rainfall and river flow trends for the Western Cape Province over two periods: 1987–2017 and 1960–2017. Annual rainfall for the most recent 30-year period shows decreasing trends, with the largest magnitude of decrease at the SA Astronomical Observatory rainfall station (-54.38 mm/decade). With the exception of the significant decreasing winter rainfall trend at Langewens (-34.88 mm/decade), the trends vary between stations for the period 1960–2017. For the period 1987–2017, statistically significant decreasing winter trends were found at four of the seven stations, and range from -6.8 mm/decade at Cape Columbine to -34.88 mm/decade at Langewens. Similarly, the magnitudes of decreasing winter river flow at Bree@Ceres and Berg@Franschoek are greater for the more recent 30-year period than for 1960–2017. Correlation coefficients for Vilij@Voeliv rainfall and four river flow stations Berg@Franschoek, Bree@Ceres, Wit River@Drosterkloof and Little Berg@Nieuwkloof) are stronger for shorter periods (i.e. 1987–2017 and 2007–2017) than that for the longer period, 1960–2017. The Intergovernmental Panel on Climate Change emphasises the importance of studies to assist with model prediction uncertainties. To this end, our study expands the understanding of regional hydrological responses to rainfall change in the water stressed region of the Western Cape Province.

scholarly journals Analysis of the Mediterranean fruit fly [Ceratitis capitata (Wiedemann)] spatio-temporal distribution in relation to sex and female mating status for precision IPM

PLoS ONE ◽  
2018 ◽  
Vol 13 (4) ◽  
pp. e0195097 ◽  
Author(s):  
Andrea Sciarretta ◽  
Maria Rosaria Tabilio ◽  
Elena Lampazzi ◽  
Claudio Ceccaroli ◽  
Marco Colacci ◽  
...  
Keyword(s):  
Ceratitis Capitata ◽  
Temporal Distribution ◽  
Fruit Fly ◽  
Mediterranean Fruit Fly ◽  
Mating Status ◽  
Female Mating ◽  
The Mediterranean ◽  
Spatio Temporal

scholarly journals Dieback and decline pathogens of olive trees in South Africa

2020 ◽  
Vol 45 (1) ◽  
pp. 196-220
Author(s):  
C.F.J. Spies ◽  
L. Mostert ◽  
A. Carlucci ◽  
P. Moyo ◽  
W.J. van Jaarsveld ◽  
...  
Keyword(s):  
South Africa ◽  
New Species ◽  
Fungal Pathogens ◽  
Fungal Species ◽  
Molecular Techniques ◽  
White Rot ◽  
Western Cape ◽  
Production Region ◽  
Wild Olive ◽  
Olive Trees

Trunk disease fungal pathogens reduce olive production globally by causing cankers, dieback, and other decline-related symptoms on olive trees. Very few fungi have been reported in association with olive dieback and decline in South Africa. Many of the fungal species reported from symptomatic olive trees in other countries have broad host ranges and are known to occur on other woody host plants in the Western Cape province, the main olive production region of South Africa. This survey investigated the diversity of fungi and symptoms associated with olive dieback and decline in South Africa. Isolations were made from internal wood symptoms of 145 European and 42 wild olive trees sampled in 10 and 9 districts, respectively. A total of 99 taxa were identified among 440 fungal isolates using combinations of morphological and molecular techniques. A new species of Pseudophaeomoniella, P. globosa, had the highest incidence, being recovered from 42.8 % of European and 54.8 % of wild olive samples. This species was recovered from 9 of the 10 districts where European olive trees were sampled and from all districts where wild olive trees were sampled. Members of the Phaeomoniellales (mainly P. globosa ) were the most prevalent fungi in five of the seven symptom types considered, the only exceptions being twig dieback, where members of the Botryosphaeriaceae were more common, and soft/white rot where only Basidiomycota were recovered. Several of the species identified are known as pathogens of olives or other woody crops either in South Africa or elsewhere in the world, including species of Neofusicoccum, Phaeoacremonium, and Pleurostoma richardsiae. However, 81 of the 99 taxa identified have not previously been recorded on olive trees and have unknown interactions with this host. These taxa include one new genus and several putative new species, of which four are formally described as Celerioriella umnquma sp. nov., Pseudophaeomoniella globosa sp. nov., Vredendaliella oleae gen. & sp. nov., and Xenocylindrosporium margaritarum sp. nov.

scholarly journals Spatio–Temporal Distribution of Polycyclic Aromatic Hydrocarbons in Urban Soils in Cape Town, South Africa

2017 ◽  
Vol 11 (2) ◽  
pp. 189-196 ◽  
Author(s):  
Raissa Andong Omores ◽  
Francois Wewers ◽  
Priscilla O. Ikhide ◽  
Thomas Farrar ◽  
Abdu-rahim Giwa
Keyword(s):  
South Africa ◽  
Polycyclic Aromatic Hydrocarbons ◽  
Aromatic Hydrocarbons ◽  
Urban Soils ◽  
Cape Town ◽  
Temporal Distribution ◽  
Polycyclic Aromatic ◽  
Spatio Temporal
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