Effects of body size, nutrition intake and mating on longevity and other reproduction aspects of Streblote siva (Lefebvre)

Document Type : Research Paper

Authors

Assistant Professor of Bushehr Agricultural and Natural Resources Research and Education Center (AREEO)

Abstract

    The Streblote siva (Lefebvre) (Lepidoptera: Lasiocampidae) is an invasive defoliator of Conocarpus erectus, Ziziphus spina-christi and Acacia ampliceps in southern of Iran. The relationship between fecundity and body size, egg size, Mating as well as longevity in female insects was studied under laboratory conditions. Effect of host’s quality on growth and gain of S. siva was performed using hosts nitrogen content which was measured by the Kjeldahl technique. The strange data range of larva weight, pupae and adult female insects rose to crescendo of oviposition in order to using different nutrition on plant species. However, there were strange relationships among fecundity and pupal weight, adult weight, there was no significant difference in the egg size of the insect reared on different plants hosts (P<0.05). The weight of 6th instar larvae was significantly correlated with female pupa and female Adult weight as well as egg number (P<0.05). Compared with the rest of the life span of the insect, the mean of RAF50 (0.23 ± 0.01), indicated that the highest oviposition rate took place in the early life of it (P<0.05).Also, the results showed that non-mating insects had a longer life span than mating insects and the sex ratio was 1:1 (P=0.66). The weight gain of larvae was not significantly different between two treatments, C. erectus and Z. spina-christi but, there was a significant difference compared with the third treatment, A. ampliceps. Finally, the results showed that the factors affecting larval weight gain such as different plants hosts may influence on adult size and following fecundity (P<0.05).
 
 

Keywords


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