EFFECT OF SOWING DATES ON THE INSECT PESTS OF FENUGREEK PLANTS IN RELATION TO ACCUMULATED HEAT UNITS AT QALUBYIA GOVERNORATE, EGYPT | ||
| Fayoum Journal of Agricultural Research and Development | ||
| Article 2, Volume 28, Issue 1, January 2014, Pages 12-26 PDF (545.66 K) | ||
| Document Type: Research articles. | ||
| DOI: 10.21608/fjard.2014.193669 | ||
| Authors | ||
| A. F. E. Afsah1; M. A. Fahim2 | ||
| 1Plant Protection Research Institute, Dokki, Giza, Egypt | ||
| 2Central Laboratory for Agricultural Climate, Dokki, Giza, Egypt | ||
| Abstract | ||
| The present work was conducted for two seasons (2010/2011- 2011/2012) in the Plant Protection Research Station at Qaha, Qalubiya Governorate to study the effect of different sowing dates (Oct.30th ; Nov.15thand Nov.30th) on the infestation of fenugreek plants (Trigonella foenum graecum) with insect pests and find models for the relationship between the accumulated heat units and seasonal populations of fenugreek pests. The obtained results revealed seven insect pests infesting fenugreek plants, two species on the leaves (Liriomyza spp. and Bemisia tabaci) and five species on the terminal buds (Acyrthosiphon pisum ; Aphis gossypii ; Aphis craccivora ; Thrips tabaci and Phytonomus brunneipennis) in different sowing dates and seasons. The seasonal populations of insect pests on fenugreek plants had varied in the three sowing dates and seasons. In addition, results showed that sowing fenugreek by mid-November received lower infestation with insect pests than early and lately sowing dates (Oct.30th & Nov.30th) and the proper date for sowing fenugreek must be in the second half of November. On the other hand, results showed varied relations for accumulated heat units (DegreeDays Units) and the mean numbers of seasonal populations of fenugreek pests. Calculation the accumulated heat units for the fenugreek insect pests confirmed the variability of seasonal populations in different sowing dates and seasons. The 1st season has highly accumulated heat units for most insect pests than the 2nd ones and differences in the accumulated heat units ranged 7.5 -19.9% in the two seasons. The larvae of leaf miner, Liriomyza spp. have varied accumulated heat units mostly increased with 13.8% in 1st season than the second ones. The accumulated heat units for B. tabaci were varied (435- 542.7 D°) in the two seasons and the difference reached 19.9%. There for, the insect don’t occur during the season if the accumulated heat units below than 435 D°. The aphid species have highly accumulated heat units in the three sowing dates ranged 1003.3-1188.7 D° in the 1st season and 901.0 - 1099.3 D° in the 2nd one with differences ranged 7.5 - 10.2%. Cotton thrips, T. tabaci has varied accumulated heat units (782.7 - 891.7 D°) in the two seasons; the 1st season has highly Degree-Days Units (DDD) than the 2nd one with difference 12.2%. The clover leaf weevil P. brunneipennis has varied accumulated heat units (603 - 715 D°) in the two seasons with difference 15.7%. The obtained results created beneficial methodological developments for designing ecological zones maps for distribution the insect pests over the country and designing dynamic program for integrated pest management (IPM) under different ecological conditions in Egypt. | ||
| Keywords | ||
| Fenugreek; Sowing dates; Insect pests; acuminated heat units; Seasonal population | ||
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