CANNIBALISM PHENOMENON BETWEEN SPOOOPTERA LITTORALIS (BOISD.) (LEPIDOPTERA: NOCTUIDAE) LARVAE IN THE LABORATORY | ||||
| Egyptian Journal of Agricultural Research | ||||
| Article 7, Volume 84, Issue 3, September 2006, Page 725-731 PDF (1.77 MB) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/ejar.2006.231469 | ||||
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| Authors | ||||
| SAADIA A. ABDEL-SAMEA1; HAFEZ A. EL-KADY2; GOMAA E. KHEDR1 | ||||
| 1Plant Protection Research Institute, Agricultural Research Center, Giza, Egypt | ||||
| 2Faculty of Agriculture, Mushtohor, Zagazig University, Egypt | ||||
| Abstract | ||||
| Cannibalism phenomenon among S. littoral's larvae under starvation and aowdness conditions was dealt, in this research, at 27 ±1°C. Four groups of larvae aged 9 days were individually starved for 1 day In the first group, 2 days in the second, 3 days in the third and 4 days in the fourth one. Thereafter, the larvae of each group were directly distributed under three densities of 5, 10, and 15 larvae / cup then allowed to develop with no feeding (complete starvation). Mother four groups of the same old larvae were also solitary starved for the same periods and distributed by the same way then received normal feeding till pupation (partial starvation). In the same time, three groups of the same old larvae were completely fed (no starvation) under the same considered densities (control). Cannibalism rate was affected dearly with starvation, ranged 25.0 - 93 3% in case of the complete starvation treatment, decreased to 5.0 — 7.5 % with the partial starvation and became very limited (1.7 - 2.5%) in the control. The highest cannibalism (32.0 - 48.9%) was noticed after one day of the grouping starvation. Crowding factor revealed also a clear effect on the cannibalism rate especially with the complete starvation larvae. No remarkable effect was noticed with unstarved larvae. Starvation significantly elongated the larval developmental period and, in the same time, increased the pupal weights. On the other hand, crowding showed an insignificant effect in this respect except the weights of the S larvae density with 1 and 2 starvation days. The two factors, starvation and aowdness, had a reveres effect either on pupation or on adult emergence percentages but in the same time, they had no dear effect on the pupal duration. Optimum and successful rearing for S. littoral's, with the least cannibalism, could be obtained when the normal feeding was done under 5 larvae / cup density, showing short larval duration and high pupation and adult emergence. In general, the cannibalism phenomenon is considered rare between Sporloptea larvae (9 days old) received suitable rearing and crowding conditions. | ||||
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