EFFECTS OF TEMPERATURES AND PLANT HOST SPECIES ON CERTAIN BIOLOGICAL CHARACTERS OF THE CASTOR BEAN WHITEFLY, Tria/eurodes ricin; MISRA (HIMEPTERA: AL YRODIDAE). | ||||
| Journal of Plant Protection and Pathology | ||||
| Article 4, Volume 30, Issue 9, September 2005, Page 5627-5640 PDF (174.53 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jppp.2005.239175 | ||||
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| Author | ||||
| Nagdy F. Abdel-Baky | ||||
| Economic Entomology Department, Faculty of Agriculture, Mansoura University | ||||
| Abstract | ||||
| Laboratory studies were carried out to determine the influence of temperature (abiotic) and host plant species (biotic) on the biological characters of the castor bean white ny, Trialeurodes riCini Misra. Four temperatures namely 15. 20, 25 and 30°C, as well as the three plant species, castor bean (Ricinus communis L), Papaya (Carica papaya L.), and sweet potato (Ipomoea balatas L.) were tested. Various temperatures affected greatly Ihe insect development, oviposilion, life cycle and generation time when reared on castor bean plants. At 30°C., egg incubation period, development of nymphal instars, adult longevity and life cycle were shortest, follollled by 25°C., while these characters were longer when the insect reared at 15 DC. The hatchability percentage and female fecundity were greater at both 30 and 25 DC. Meanwhile they were lower at 15°C. The temperature threshold (to) and thermal accumulative effect (degree·days) were also calculated. The laboratory studies were confirmed by field applications regarding the relationship between temperatures among the geographical seasons and the insect populations. The study demonstrates that T. ricini can, in otherwise unlimited conditions, persist and increase in number within the range 20-30 aC. Therefore, the pest is well adapted to high temperatures and may extend its distribution if the mean world temperatures increase because of global warming. Regarding the plant hosl species, the castor bean was the preferred host followed by papaya, while the sweet potato was not preferred for insect rearing. This indicated that the host plant species had a significant effect on egg hatchability, nymphal survival. female fecundity and the duration of life cycle of T. ricini. | ||||
| Keywords | ||||
| caster bean whiteny, Trialeurodes ricin! Misra, biological; ~pects, effect of temperature, temperature Ihreshold, thermal accumulative units, degree days, plant host, castor bean, papaya, sweet potato, | ||||
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