Degree-days units and expected generation numbers of peach fruit fly Bactrocera zonata (Saunders) (Diptera: Tephritidae) under climate change in

Abstract

Climate change could profoundly affect the status of agricultural insect pests. This study predicts expected peach fruit fly (PFF) annual generations under current and future climate by using the accumulated thermal heat units expressed as degreedays unit (DDU). We evaluated how temperature expected to influence the annual generation numbers in three governorates of Egypt using the climate change data output from the HadCM3 model for A1 scenarios proposed by the Intergovernmental Panel on Climate Change. Results indicated that PFF in Asyout have the highest number of possible generations as compared to other locations (North Sinai and EL Beheira) under current climate to be 8 compared with 6 and 7 for other locations, respectively. Generation numbers of PFF under climate change conditions would be increased especially in Asyout governorate to 9 and 10 by 2050 and 2100, respectively. However, the expected generation numbers of PFF at 2050 and 2100 will be 8-9 and 9-10 generations per year for other two locations, respectively.

Analysis of factors influencing population density of the peach fruit fly (PFF),Bactrocera zonata(Saunders) (Diptera: Tephritidae) in Assiut, Northern Upper Egypt

“…It has over 500 genera represented by about 4000 species distributed throughout the temperate, subtropical and tropical areas of the world (Christenson & Foote 1960;Abdullah 2008;Rattanapun 2009;Khalil et al 2010;Mosleh et al 2011;El-Gendy 2012). With few exceptions, most of fruit flies are polyphagous in nature with considerable diverse host range, usually feeding on closely related hosts.…”

“…This pest was recorded on more than 50 cultivated and wild plant species, mainly those with fleshy fruits (White & Elson-Harris 1992;Khalil et al 2010). Infestation not only cause severe damage by reducing both fruit production and quality, but also impede exportation of fresh fruits due to the quarantine restrictions (Chen et al 2006).…”

“…Despite the abundance of research dealing with the behaviour and rearing of B. zonata (Christenson & Foote 1960;Amin 2008;Khalil et al 2010), gaps remain in the ecological understanding of various climatic factors affecting its population density. According to Bateman (1972), the range of environments to which this species is exposed is extremely broad, and there is no single environmental component which stands out as a determining factor in its population abundance.…”

Estimation of number of generations of Spodoptera litura Fab. on peanut in India during near and distant future climate change scenarios

“…Production of more number of generations annually with extreme temperatures in case of majority of insect species was well known and this phenomenon becomes regular with gradual warming (Lastuka, 2008) and our results add S. litura on peanut in India to the list as a case in point. The information on occurrence of additional generations with increase in temperature was well documented across various insect orders viz; lepidopterans -Nephotettix cincticeps (Yamamura et al, 2006), Plutella xylostella, (Kiritani, 2006), Cydia pomonella (Marchioro and Foerster, 2011;Hirschi et al, 2012), Phthorimaea operculella (Abolmaaty et al, 2011) and other orders (Khalil et al, 2010;Hlasny et al, 2011). It was found that a substantial proportion of the 263 multivoltine lepidopteran species in his dataset exhibited an increased frequency of second and subsequent generations since 1980, with 44 species displaying a stable increase in the number of generations after 1980 (Altermatt, 2010).…”

Seasonal population trend of the peach fruit fly (PFF),Bactrocera zonata(Saunders) (Diptera: Tephritidae), in Assiut, Northern Upper Egypt

“…It has over 500 genera represented by about 4000 species distributed throughout the temperate, subtropical and tropical areas of the world (Rattanapun 2009;Khalil et al 2010;Mosleh et al 2011;El-Gendy 2012). Among the various species of tephritid flies, the peach fruit fly (PFF), Bactrocera zonata (Saunders), is an extremely aggressive pest infesting some of the main commercial fruit and vegetables (Amin 2003;White & Elson-Harris 1992).…”