Temperature Effect and Biological Aspects of Phenacoccus parvus Morrison (Hemiptera: Pseudococcidae). | ||||
| Journal of Plant Protection and Pathology | ||||
| Article 5, Volume 9, Issue 5, May 2018, Page 309-313 PDF (456.12 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jppp.2018.41668 | ||||
 View on SCiNiTO | ||||
| Author | ||||
| Naglaa M. Youssef | ||||
| Plant Protection Research Institute, Dokki, Giza, Egypt | ||||
| Abstract | ||||
| The present study was carried out under laboratory conditions to investigate the influence of four constant temperatures (20, 25, 30 and 35oC) and 60±5% R.H.on the development of the immature stages of Phenacoccus parvus Morrison as well as on the reproductive potential of the adult, and to estimate the relation between thermal units required for the development and degree-days (DD's). The incubation period lasted 6.6 ± 0.22, 5.8 ± 0.13, 4.2 ± 0.20 and 3.2± 0.13 days for eggs at constant temperatures 20, 25, 30 and 35oC, respectively. The developmental period of nymphal stage tended to be shortened with the corresponding increments of temperature. At a specific temperature, the developmental period of the nymphal stage was 25± 0.09, 22.5± 0.06, 17.1± 0.12 and 13.7± 0.09 days at 20, 25, 30 and 35oC, respectively. The calculated developmental thresholds (t0) of the egg and nymphal stages were found to be 7.58 and 3.72oC, respectively; meanwhile, the calculated developmental threshold of the whole immature stages was estimated as 5.71 and 5.76oC for male and female, respectively. The mean thermal units required for development of P. parvus eggs and nymphal stages were 469.80, 134.88 DD's degree-days, respectively. | ||||
| Keywords | ||||
| Phenacoccus parvus; biology; thermal units; degree-day | ||||
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