The rice weevil, Sitophilus oryzae (L.), is one of the main pests of rice and other stored grains. Due to the negative effects of synthetic pesticides on the environment and non-target organisms, more environmentally benign alternative control techniques are needed for controlling pests. In the present study, the development, reproduction, and digestive enzyme activity of Sitophilus oryzae (L.) were evaluated on 12 rice cultivars under laboratory conditions [28 ± 1 °C, 60 ± 5% RH, and a photoperiod of 16:8 (L: D) h]. Among tested rice cultivars, the developmental time of S. oryzae immature stages was the shortest on DomSiah (33.0 days), Hashemi var. Guilan (34.0 days) and Hashemi var. Mazandaran (34.0 days) and the longest on Neda (44.5 days). The highest fecundity was recorded for beetles reared on cultivars DomSiah (316.8 eggs), Hashemi var. Mazandaran (301.1 eggs), and Hashemi var. Guilan (293.3 eggs); and the lowest for beetles reared on cultivar Neda (147.0 eggs). The highest survival of immature stages was recorded on cultivars Hashemi var. Mazandaran (80.0%), AliKazemi (75.2%), DomSiah (73.6%), and Hashemi var. Guilan (71.0%) whereas those on cultivar Neda (25.3%) had the lowest survival. The female adults that developed from larvae reared on cultivars Neda, Govhar, and Fajr had the lowest body mass (67.7, 68.6, and 69.4 mg). Also, the males’ mass was the lowest on cultivars Neda, Fajr, Shiroudi, and Govhar (60.7, 62.2, 62.9 63.3 mg, respectively). The adults developed from larvae reared on cultivars Fajr and Neda had the lowest levels of α-amylase activity (1.77 and 1.64 mU/min/individual, respectively). Also, those reared on cultivar Neda had the lowest levels of protease activity (0.067 OD/min/individual). Results suggest cultivar Neda, as an unsuitable food for S. oryzae development that negatively affects the amylolytic and proteolytic activity of this pest, could be considered in the integrated management programs of this pest.

水稻象鼻虫Sitophilus oryzae (L.) 是水稻和其他储藏谷物的主要害虫之一。由于合成农药对环境和非目标生物的负面影响，需要更环保的替代控制技术来控制害虫。在本研究中，在实验室条件 [28 ± 1 °C、60 ± 5% RH 和 16:8 光周期下，对 12 个水稻品种的Sitophilus oryzae (L.)的发育、繁殖和消化酶活性进行了评估(L: D) h]。在受试水稻品种中，S. oryzae的发育时间未成熟阶段在 DomSiah 上最短（33.0 天），Hashemi var。桂兰（34.0 天）和哈希米变种。Mazandaran（34.0 天）和 Neda 最长的（44.5 天）。在栽培品种 DomSiah（316.8 个卵）、Hashemi var. 上饲养的甲虫记录的繁殖力最高。Mazandaran（301.1 鸡蛋）和 Hashemi 变种。桂兰（293.3个鸡蛋）；在栽培品种 Neda 上饲养的甲虫最低（147.0 个卵）。栽培品种Hashemi var. 记录了未成熟阶段的最高存活率。Mazandaran (80.0%)、AliKazemi (75.2%)、DomSiah (73.6%) 和 Hashemi var。Guilan (71.0%) 而那些栽培品种 Neda (25.3%) 的存活率最低。从在品种 Neda、Govhar 和 Fajr 上饲养的幼虫发育而来的雌性成虫体重最低（67.7、68.6 和 69.4 毫克）。此外，在品种 Neda、Fajr、Shiroudi 和 Govhar 上，雄性的质量最低 (60.7, 62.2、62.9 和 63.3 毫克）。从在栽培品种 Fajr 和 Neda 上饲养的幼虫发育的成虫具有最低水平的 α-淀粉酶活性（分别为 1.77 和 1.64 mU/min/个体）。此外，那些在品种 Neda 上饲养的蛋白酶活性水平最低（0.067 OD/min/个）。结果表明，品种 Neda 不适合食用对这种害虫的淀粉分解和蛋白水解活性产生负面影响的米曲霉发育可以考虑在这种害虫的综合管理计划中。