EFFECT OF TEMPERATURE AND HOST PLANT ON DVELOPMENTAL TIMES AND LIFE TABLE PRARMETERS OF TETRANYCHUS URTICAE KOCH ON PERSIMMON TREES. (ACARI: TETRANYCHIDAE) | ||
| Egyptian Journal of Agricultural Research | ||
| Article 17, Volume 91, Issue 2, July 2013, Pages 595-607 PDF (445.96 K) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/ejar.2013.163532 | ||
| Authors | ||
| AHRAF S . EL-HALAWANY1; NAZEEH M. ABD EL-WAHED2 | ||
| 1Plant Protection Research Institute, ARC, Dokki, Giza, Egypt. | ||
| 2Plant protection Research Institute, ARC, Dokki, Giza, Egypt. | ||
| Abstract | ||
| The two-spotted spider mite, Tetranychus urticae Koch is one of the most important pests of deciduous fruit trees in Egypt. The reproduction, survival, and life table parameters of T. urticae on Kostata and Hachiya Persimmon cultivars leaves were studied under laboratory conditions of 15, 20, 25 and 30 ± 2ºC, 70 ± 5% RH and a photoperiod of 16L: 8D. The shortest period of incubation, immature stages and female longevity were 3.27, 8.92 and 12.98 days, while these periods for males were 3.35, 7.8 and 11.8 days at 30ºC on Kostata persimmon variety, respectively. 30 ºC gave the maximum value of intrinsic rate of increase (rm) 0.243 and 0.297 individuals/♀/ day on and maximum net reproductive rate (Ro) 47.51 and 63.47 individuals/♀ on Kostata and Hachiya varieties, respectively. Maximum fecundity was obtained on Kostata variety at 30ºC at day 15 as 8.93 eggs/♀/day. It was concluded that the Hachiya variety was more favorable for T. urticae than Kostata variety resulting in the highest fecundity and reproduction at 30°C. | ||
| Keywords | ||
| TETRANYCHUS URTICAE KOCH; ACARI: TETRANYCHIDAE) | ||
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