EFFECT OF TEMPERATURE, PHOTOPERIOD, BIOLOGICAL AND CHEMICAL FACTORS OF THREE HOST SPECIES ON THE PERFORMANCE OF THE EGG PARASITOID Trichogramma evanescens WEST. | ||||
| Journal of Plant Protection and Pathology | ||||
| Article 2, Volume 4, Issue 9, September 2013, Page 781-793 PDF (440.22 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jppp.2013.87484 | ||||
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| Authors | ||||
| M. M. Metwally; M. W. El-Kordy; H. A. Mohamed; A. El-Sebai; A. A. Atta | ||||
| Dept. of Plant Protection (Economic Entomology), Fac. of Agric., Cairo, Al-Azhar Univ. | ||||
| Abstract | ||||
| In order to evaluate the activity of Trichogramma evanescens west due to the effect of temperature, photoperiod egg size, weight, total protein, carbohydrates, and lipids of threehost species Sitotroga cerealella Oliv., Pectinophora gossypiella, Spodoptera littoralis without scales and S. littoralis with scales. The highest percentage of parasitism was obtained in P. gossypiella (66.75%) followed by 57.25, 41.5 and 16.25% in S. cerealella, S. littoralis without scales and S. littoralis with scales, respectively. While, The highest percentage of adult wasps emerged from the parasitized host was occurred in S. cerealella (45%). Results reflected eggs of S. cerealella was more preferredfor T. evanescens wasps than S. littoralis eggs due to larger amount of protein, carbohydrates, lipids and egg weight (13.36, 2.4 and 3.59 mg/gm) respectively. The consequences of these observations led to high percentage of parasitism and adult wasps emergence (57.25 and 45.0%) in case of wasps produced from S. cerealella. Host egg size significantly differed (P= 0.0098) between all tested host eggs. While, no significant difference (P= 0.0956) was recorded for the egg weight between all tested egg host. Effect of light period [light regimes; (A)16:8h L:D, (B)12:12h L:D, (C) 8:16h L:D at 25±1ºC and 70±5% RH] on the rate of parasitism and sex ratio of the parasitoid T. evanescens. The highest rate of parasitism (86.75 %) was recorded in the treatment (A), while the lowest rate (77.25%) was found in the treatment (B). Sex ratios in the treatments (A, B and C) were 68.25, 74.25, and 78.5% for Females, respectively. No significant differences was recorded among different photoperiod regimes tested with respect to longevity and life cycle. Positive relationship between temperature and T. evanescens percentage of parasitism and negative relationship between longevity and temperature were recorded. | ||||
| Keywords | ||||
| Trichogramma evanescens; temperature; photoperiod.Host preferances | ||||
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