Successful of Sterile Insect Techniques (SIT) depend on ability of sterile male population to compete with normal male for mating with female and lead to a reduction in pest population numbers and sufficiently effective autocidal control. So effects of radiation doses (0, 30, 50, 70 and 90 Gy) on fertility traits and wings morphometric characters for both sexes of peach fruit fly (PFF) Bactrocera zonata were assayed, in addition different levels of over loading irradiated males to normal population of PFF (sex ratio 1:1) were also concerned. Percents of observed and expected egg hatching and daily egg laying, then competiveness values between irradiated and normal females were estimated. Irradiated males, mated with normal females, induced them to reduce egg laying rates less than the case of irradiated females only or both sexes. However, dose of 70 Gy for males and 50 Gy for either females or both sexes will be sufficient to decrease daily egg laying of females. On the other hand, significantly reduction of egg hatching percentages was noticed with doses of 70 Gy for either females or both sexes, and 90 Gy in case of treated males only. Gamma radiation doses have significant effect on angles and wings length of males and wings width of females. Confined males irradiated with 70 or 90 Gy in numbers as four times as normal males number in PFF population caused depleting in egg hatching percents (ranged between 5.07%: 13.55%). Moreover, the last case gave egg hatching percentages close significantly to cases of irradiation both sexes or male only with 90 Gy (4.28 and 5.49%, respectively), that harboured highest competitiveness value of irradiated males.

Egypt is considered one of the important tomato producers in the world that has appropriate climate for tomato along year in three different plantation seasons viz., winter, autumn and summer. Tomato infestation with tomato leaf miners (TLM) reached 70% in El-Behera governorate in 2011. So current study aimed throw some lights on population fluctuation of TLM males along two year (2013-2014) and different seasons by using pheromone traps, in addition studying the effect of climatic factors (Maximum, minimum, mean temperature and relative humidity)on males activity. Moreover and basically estimation numbers, duration of annual generations and population density in all observed generation by applying two different mains[First main depend on Daily Degree Units and second main suggested by Audemard and Millaire (1975) and emended by Iacob (1977)] in generation estimations were also concerned. Results reflected that TL Mmale population density of LTM varied from season to another. Spring season was the highest followed by summer, but each of winter and autumn were the lowest, that there were no significant differences between the last two seasons. Effect of tested climatic factors is obvious along a year, not can be observed in specific seasons, that their combined effects responsible as a group for 34.09% and 35.76 % on population density in the both years of study, respectively. Eleven annual generations were observed along a year in both years of study, moreover times and duration of all estimated generations were paralleled in the both used mains of generation estimations. The first and eleventh generations were nearly longest but with lowest in TLM male population numbers. The Ninth generation, considered as overlapped generation between summer and autumn season. Each of spring, summer and autumn season have three generations.

No abstract

No abstract

A B S T R A C TCorn leaf aphid Rhopalosiphum maidis and bird cherry-oat aphid R. padi, attacking many host plants, which be recorded not only in most localities of Egypt but also along a year. So, numbers of generations could be calculated and predicted in all localities by employing Geographical Information System (GIS) and by exploiting calculated values of daily degree units and thresholds of development for them, with current and future thermal climatic conditions. Biannually generations' numbers of them differ from region to another, that numbers of wintery and summery generations of R. maidis ranged between 1-29 and 12-50 generations, respectively under current conditions. Expected generations numbers will changed with rates ranged between -4: 14 and -24:16 generations, respectively in 2050, and with rates ranged -3: 15 generation and -42: 17 generation, respectively in 2070. On other hand, Numbers of wintery and summery generations of R. padi ranged between 1-27 and 11-42 generations, respectively under current conditions. Finally expected numbers of wintery and summery generation in 2070 will be nearly similar to 2050, that its changing rates ranged between -3: 14 generation and -36: 16 generation, respectively. Temporal spatial distributions and variations of generation numbers in different regions and governorates of Egypt were discussed under current and future conditions. Moreover future of growing cereal crops was also discussed especially in southern reclaimed regions.