ORIUS HIGERWOLFF)HETEROPTERA: ANTHOCORIDAE( و سن )THYSANOPTERA:PHLAEOTHRIPIDAE( HAPLOTHRIPS TRITICI KURD. مطالعه تاثير رقم و مراحل رشدي گندم بر تعامل سه جانبه گندم ، تريپس گندم

Effects of Wheat Cultivars and Their Phenological Stages on the Tritrophic Interaction of Wheat, Haplothrips tritici Kurd. (Thysanoptera: Phlacothripidae)and Orius niger Wolff (Heteroptera: Anthocoridae)

The number of adults, nymphs, eggs laid and eggs production in ovariols of O. niger and also the number of eggs, larvae and adults of I-Icrplothrips tritici were determined at the phenological stages of booting, ear emergence, [lowering, early milk. late milk, dough development and ripening of three wheat cultivars. The higher population density of O. niger (sum of eggs. nymphs and adults) was appeared in Alvand, Roshan and Sardari cultivars. respectively (p<5%). Also. the population density of O. niger was highest at the, flowering stage in comparison with other phenological stages of three wheat cultivars. Within different developmental stages of O. niger, the highest number of eggs, nymphs and adults were observed at the flowering, milk development and dough development stages of three. wheat cultivars. respectively. The higher population density of H. tritici (sum of cogs. larvae and adults) was appeared in Roshan. Alvand and Sardari cultivars, respectively (p<5%). Also. the population density of H. tritici was highest at the flowering stage in comparison with other phenological stages of three wheat cultivars. Within the different developmental stages of Il. tritici, the highest number of eggs and adults were recorded at the ear emergence and the highest number of larvae was recorded at the flowering and early milk of three wheat cultivars. With regard to the interaction of cultivars and the phenological stages of wheat, the highest population density of H. tritici was observed at the flowering stage of Roshan and the highest population density of O. niger was appeared at the flowering stage of Alvand.