A 2-year field experiment was conducted at the Experimental Farm of Rice Research and Training Center, Sakha, Kafr El-Sheikh Egypt during 2014 and 2015 seasons, to study the effect of sowing date (15^th of April, 1^st of May and 15^th of May)  on  grain  yield  of  twenty rice  genotypes, and infestation by Rhizopertha dominica (F.). Sowing date had significant effects on all studied characters in both years. The highest values of number of panicles per hill, number of filled grains per panicle, grain yield, hulling, milling and broken rice grain were recorded in the early sowing date. The number of days from seeding to maturity and number of unfilled spikelets per panicle were recorded in the decline trend, as sowing was delayed.  Egyptian Hybrid Rice 1 produced the highest values of grain yield followed by Giza179, and Giza178. Sakha106 produced maximum values of hulling and milling percentages. Regarding to the susceptibility of rice varieties to insect infestation by lesser grain borer, R. dominica in storage, data showed that the were Giza 178, Sakha 102, Sakha 104, Sakha 105, Giza 182, Giza179, GZ 9057-6-1-3-3, GZ 9577-4-1-1, GZ 9523-2-1-1-1 and GZ 9514-3-1-3-1 ha lower infestation. The moderate infested varieties were Sakha 103, Sakha 106, GZ 9328-1-2-1-3, GZ 9362-34-2-1-3, GZ 9461-4-2-3-1 and Egyptian Hybrid1. The highest infested ones were Giza 177, Sakha 101, GZ 9057-6-1-3-4 and Egyptian Yasmin. Also, data showed that the number of F_1, progeny and susceptibility index (SI) recorded the lowest values when rice was sown on 15^st of April, but they recorded the highest values when sown on 15^th of May. The duration of life cycle decreased with late sowing dates. Also, results revealed highly positive significant correlation between insect infestation and hulling% and milling%.