Keywords : Ultraviolet
Effect of ultraviolet radiation UV at eggs and larvae of the lesser grain borer beetle Rhyzopertha dominica (Fab.) (Coleoptera: Bostrichidae).
journal of kerbala university,
2015, Volume 11, Issue 2, Pages 50-54
The effect of ultraviolet radiation UV on the eggs and larvae of the lesser grain borer beetle Rhyzopertha dominica (Fab.). It is used in this study length wave 312 nm of ultraviolet radiation(UV) and with different periods times (10,15,20 minutes). The results are showed the following : The eggs very sensitive and two periods age (1-2),(5-6) days increased whereas mortality with increasing of periods exposed to UV radiation in comparison with controlling and the eggs were the age (1-2) days that will be more sensitive towards UV radiation from eggs(5-6) days in all periods exposed , and mortality are 55.86 , 45.35 % for tow ages (1-2), (5-6) days respectively when exposed for period 20 minutes and increased the mortality larvae and pupae which are resulted from that eggs treatment .
In concerning larvae for the two periods 2nd and 4th stage to UV radiation exposed .The sensitivity of 2nd larvae was higher than 4th stage in the all exposed periods (15,20,25) minutes. Mortality was highest and it results 54.78 , 37.42 % for 2nd and 4th larvae stage respectively in 25 minutes exposed .
The study showed increasing of pupae deformations which resulted from 2nd and 4th larvae treatment. As results showed decreasing ratio emergence adults with different stage and period of exposing to larvae . We found the ratio emergence adults to 2nd larvae stage treatment are less than concerning to 4th larvae stage in all treatment they were the least which are 13.30 % for 2nd stage larvae in period 25 minutes exposed .
Effect of ultraviolet radiation UV at the first generation (F1) of the lesser grain borer beetle Rhyzopertha dominica (Fab.) (Coleoptera: Bostrichidae)
journal of kerbala university,
2015, Volume 11, Issue 2, Pages 74-78
The study was applied to show the effective of ultraviolet radiation UV in the first generation (F1) of the lesser grain borer beetle Rhyzopertha dominica (Fab.) (Coleoptera: Bostrichidae) which resulted from adults mating that was radiated at stage of pupae at ages (5-6) days and with a length wave 312 nm with different durations times(30,35,40 minutes) , according to style of mating. The results showed that decreasing of number of eggs which females laid and ratio of hatching for both radiated males and females with increasing duration of radiation. We found average of eggs that was laid (19.33 eggs/ female) when mating radiated males and females at pupae stage and it exposed for a period 40 minutes. Otherwise it was the ratio non hatching was (47.88%) and we find that ratio at same style of mating .
We noticed decreasing of average of eggs laid and the ratio non hatching eggs at the mating of irradiated males with radiated females in comparison with mating radiated males and irradiated females , we found that case in all duration times of radiation. After that the pupae and larvae increased their the ratio of mortality that resulted from mating radiated males with irradiated females and we found the highest average was (23.63%) for larvae , at the period of exposed for radiation 40 minutes and for the pupae was (12.82%) at the period of radiated periods 35 minutes. When irradiated males mated with radiated females , there was the highest number average of mortality , and its average was 22.82% for larvae and for the pupae it was 11.82% at the period 30 minutes.
Finally the ratio of emergence for adults was decreased in all styles of mating treatment in comparison with control. And it was the least average of emergence was 8.60% in the case of mating radiated males and females at 40 minutes.