Biological Characteristics and Accumulated Thermal Heat Units of Tomato Borer, Tuta Absoluta (Meyrick) | ||
| Journal of Plant Protection and Pathology | ||
| Article 9, Volume 7, Issue 6, June 2016, Pages 405-410 PDF (268.29 K) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/jppp.2016.50622 | ||
| Authors | ||
| A. I. Abdel Kareim1; S. A. Moustafa2; Engy M. S. El-Tanahy3 | ||
| 1Faculty of Agric., Mansoura Univ. | ||
| 2Plant Protection Research Institute, Dokki, Giza, Egypt | ||
| 3Plant Protection Research Institute, Mansoura | ||
| Abstract | ||
| The present experiments were conducted under laboratory conditions to study the effect of different constant temperatures (25, 30 and 350C) on the development and mortality of the different stages of tomato leafminer, Tuta absoluta (Meyrick) , and to determine the thermal units required for T.absoluta development in relation with degree-days (DD's).The incubation period lasted 5.0 ± 0.6, 4.0 ± 0.6 and 3 ± 0.6 days for eggs at constant temperatures 25, 30 and 35 oC, respectively. The duration of the larval stage was 18.1± 0.2, 12± 0.2 and 8.5± 0.2 days at 25, 30 and 35 oC, respectively. The pupal average durations were 8.5± 3.1, 5.8± 1.4 and 5.2 ± 1.4 days at 25, 30 and 35oC, respectively. The total developmental periods from egg to adult emergence were 31.6 ±4.5, 21.9 ±1.8 and 16.7 ±1.2 days for 25,30 and 35 oC, respectively. These results proved that all the developmental periods decreased with increasing temperature. The thresholds of development (t0) were 10.4, 16.3, 8.6 and 13.8 for eggs, larvae, pupae and all immature stages, respectively. The mean thermal constant required for development of T. absoluta eggs, larvae and pupal stages was 75.5 DD's, 160.8 and 182.3 degree-days, respectively | ||
| Keywords | ||
| Tuta absoluta; thermal units; degree-days; Development | ||
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