The gall-midge Psectrosema tamaricum (Kieffer 1912) (Diptera: Cecidomyiidae) forms small ovoid or fusiform swelling galls on the leaf branches and flowering shoots of Tamarix nilotica (Ehrenb.) (Family: Tamaricaceae). The present work studies the interaction of P. tamaricum with T. nilotica. It is an attempt to predict the potential current distribution of P. tamaricum and the host plant T. nilotica in Egypt using ecological-niche modeling.; in addition to the effect of altitude and vegetation cover on its distribution. Within the study areas, the number of galls per plant and plant cover had a significant positive correlation. There was no statistically significant relationship between the number of galls per plant and elevation. Temperature, elevation, and relative humidity were the strongest determinants of P. tamaricum potential distribution. Precipitation, soil types, and temperature were the most significant predictors for the potential distribution of T. nilotica. The present study suggests that gall-forming insects prefer larger plants to small plants. The present study reported that the highly suitable habitat for P. tamaricum is lower than for T. nilotica by 93.4% of the total highly suitable area.

瘿蚊Psectrosema tamaricum (Kieffer 1912)（双翅目：瘿子科）在柽柳(Ehrenb.)（科：柽柳科） 的叶枝和花枝上形成小的卵形或纺锤形肿瘿。目前的工作研究了P. tamaricum与T. nilotica的相互作用。这是利用生态位模型来预测埃及P. tamaricum和寄主植物T. nilotica的潜在当前分布的尝试。除了海拔和植被覆盖对其分布的影响之外。在研究区域内，每株植物的虫瘿数与植物覆盖度呈显着正相关。每株植物的虫瘿数与海拔之间没有统计学上的显着关系。温度、海拔和相对湿度是柽柳潜在分布的最强决定因素。降水量、土壤类型和温度是尼罗罗非鱼潜在分布最重要的预测因素。目前的研究表明，形成瘿的昆虫更喜欢较大的植物而不是较小的植物。本研究报告称，柽柳的高度适宜栖息地比尼罗柽柳的高度适宜栖息地低93.4%。