THE RELATIVE EFFICIENCY OF TWO METHODS FOR SAMPLING INSECT POPULATIONS ASSOCIATED WITH SORGHUM HEADS | ||
| The Iraqi Journal of Agricultural Science | ||
| Article 1, Volume 43, Issue 0, March 2013, Pages 35-47 | ||
| Authors | ||
| Hameed H. Al-Karboli; Musa M. Al-Hasnawy | ||
| Abstract | ||
| Field experiment was conducted to assess the population density of insect species associated with sorghum panicle in Abu- Ghraib, during fall season 2008. Results showed that no differences in species collected by the two methods, So direct method may be used in sampling program, because it is easy and gives fast results. Data indicate the presence of 9 Insect species associated with sorghum panicle, which belong to different orders. These species included: two species of thrips which considered to be new record on sorghum in Iraq: Haplothrips Salloumensis Prisner and Chirothrips molestus Prisner, In addition to Buds and flower bug, Crenotiades pallidus (Rambur), the seed bug, Campylomma impicata Wagner, the Anthocorid bug, Orius albidipennis (Reuter) and corn leaf aphid, Rhopalosiphum maidis Fitch. Infestation by thrips occurred after seedling emergence, and then increased gradually to reach a peak of 20, 25/individual/panicle on cultivars Rabih and Inkad respectively. Numbers of seed bug began to increase gradually and reached its highest peak in October, amounting to 4 and 5 insect/panicle on cultivars Rabih and Kafir respectively. Results indicated a mora differences between the numbers of bud and flower bug, of various head cultivars, the highest numbers of 4.5 bug were on Kafir and the least numbers recorded on money maker (0.92). Sorghum cultivars showed a significant difference in the numbers of the leaf corn aphid, the highest numbers of 50.33 for cultivars Inkhad, and the lowest were on hybrid money maker 11.54. Numbers of Orius albidipennis begins to increased gradually after flowering to reach its peak during October on all cultivars, the highest numbers were 6.92 on Rabih which significantly differ from 1.46 observed on money maker. The role of these results in the sampling program for sorghum insects also discussed. | ||
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