INFELUENCE OF DIFFERENT PHOTOPERIODS ON SOME BIOLOGICAL ASPECTS OF THE TRUE SPIDER Steatoda triangulosa ( WALCK.) | ||||
| Journal of Plant Protection and Pathology | ||||
| Article 6, Volume 31, Issue 10, October 2006, Page 6753-6759 PDF (84.65 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jppp.2006.235331 | ||||
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| Author | ||||
| M. F.R. Mahmoud . | ||||
| Depart. of Plant Protection . Faculty of Agric. . Fayoum Univ. | ||||
| Abstract | ||||
| The true spider Steatoda triangufosa ( Walck.) was reared on Spodoprera iittoraiis larvae under different four photoperiods 1. 8. 16 and 24 hours at 25 1- 1°C and 65 % RH .The shortest incubation period was 11.24 days and ranged between 8- 12 days with 1 hour photo period . the longest period was 14.22 and ranged between 13-16 days with 8 hours photo period. The highest rate of egg hatching was 9?.8 % occurred with 24 hours photo period and the lowest was 94.4 % with 8 hours. For the total duration of immature stage, the total immatures period of females was longer than that of males . The longest period of males occurred with 1 hour. Photo period with an average of 82.4 days and the shortest period observed with 16 hours photo period with an average of 50 days . For females. the longest period was 89.? days with 1 hour. and the shortest was 56.0 days with 16 hours photo period . For longevity, female longevity was longer than that of male . The longest periods of pre- oviposition , oviposition and post-oviposition were obtained on 16 hours with an average of 14.4 . 58.43 and 40.2 days. reSpectively . For fecundity , the highest fecundity occurred with 16 hours. followed by 8 . 24 and 1 hour, respectively. Female deposited the highest number of oothecae with an average of 6.4 I female correlated with the highest number of eggs with an average of 106.24 eggs! female with 16 hours . On the other hand . the lowest number of oothecae 3.2 oothecae I female correlated with the lowest number of eggs laid 41.12 eggs occurred with 1 hour photo period . | ||||
| Keywords | ||||
| True spider; Steatoda trianguiosa. Photoperiod; Biological aspects | ||||
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