Mahmoud ., M. (2006). INFELUENCE OF DIFFERENT PHOTOPERIODS ON SOME BIOLOGICAL ASPECTS OF THE TRUE SPIDER Steatoda triangulosa ( WALCK.). Journal of Plant Protection and Pathology, 31(10), 6753-6759. doi: 10.21608/jppp.2006.235331
M. F.R. Mahmoud .. "INFELUENCE OF DIFFERENT PHOTOPERIODS ON SOME BIOLOGICAL ASPECTS OF THE TRUE SPIDER Steatoda triangulosa ( WALCK.)". Journal of Plant Protection and Pathology, 31, 10, 2006, 6753-6759. doi: 10.21608/jppp.2006.235331
Mahmoud ., M. (2006). 'INFELUENCE OF DIFFERENT PHOTOPERIODS ON SOME BIOLOGICAL ASPECTS OF THE TRUE SPIDER Steatoda triangulosa ( WALCK.)', Journal of Plant Protection and Pathology, 31(10), pp. 6753-6759. doi: 10.21608/jppp.2006.235331
Mahmoud ., M. INFELUENCE OF DIFFERENT PHOTOPERIODS ON SOME BIOLOGICAL ASPECTS OF THE TRUE SPIDER Steatoda triangulosa ( WALCK.). Journal of Plant Protection and Pathology, 2006; 31(10): 6753-6759. doi: 10.21608/jppp.2006.235331
INFELUENCE OF DIFFERENT PHOTOPERIODS ON SOME BIOLOGICAL ASPECTS OF THE TRUE SPIDER Steatoda triangulosa ( WALCK.)
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 .
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