Threshold Temperatures and Thermal Requirements for the Development of the Olive Leaf Moth; Palpita unionalis Hbn. (Lepidoptera: Pyralidae) | ||
| Egyptian Academic Journal of Biological Sciences. A, Entomology | ||
| Article 10, Volume 10, Issue 3, May 2017, Pages 81-88 PDF (290.73 K) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/eajbsa.2017.12655 | ||
| Authors | ||
| Hassan F. Dahi1; Walaa G. Ibrahim1; Amany N. . Mansour2; Ahmed I. 2 Imam2 | ||
| 1Plant Protection Research Institute, Agricultural Research Center, Dokki, Giza, Egypt. | ||
| 2Plant Protection Department, Desert Research Center, El Matariya, Cairo, Egypt. | ||
| Abstract | ||
| Olive leaf moth, Palpita unionalis (Hubner) (Lepidoptera: Pyralidae) is one of the dangerous pests attacking sapling olive trees and nurseries, tender shoots and ripening fruits inducing economic losses. Accordingly, great efforts were dedicated to reduce its infestation. The current study aimed to calculate temperature thresholds (t0) and accumulated heat units (dd’s) for each stage of this pest as a primary step for developing a forecasting system that will help to define the most precise time for different control programs. The insect was reared under three constant temperatures (17, 22 and 27°C each ± 1°C). The time required for development through egg, larva, pupa and pre-ovipostion increased at lower temperatures. The lower thresholds of development (t0) were 8.39, 11.46, 13.38 and 12.70°C for eggs, larvae, pupae and pre-oviposition period, respectively. The average accumulated heat units required for their development were 61.07, 238.81, 113.68 and 38.17 degree-days. On the other hand, the lower threshold of development (t0) to complete a generation was 12.04°C and the average accumulated heat units required for its development was 443.07 degree-days | ||
| Keywords | ||
| Olive leaf moth; Palpita unionalis; accumulated heat units (degree-days); temperature threshold (t0) | ||
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