Laboratory of Entomology and Agricultural Zoology, Department of Agriculture Crop Production and Rural Environment, University of Thessaly, Phytokou Street, 38446, N. Ionia, Magnesia, Greece.
U.S. Department of Agriculture, Agricultural Research Service, Center for Grain and Animal Health Research, 1515 College Avenue, Manhattan, KS, 66502, USA.
Environ Sci Pollut Res Int. 2023 Nov;30(51):110805-110811. doi: 10.1007/s11356-023-29807-9. Epub 2023 Oct 5.
We tested the effect of simultaneous infestation by adults of the lesser grain borer, Rhyzopertha dominica (F.) and the rice weevil, Sitophilus oryzae (L.) on six sorghum varieties. For this purpose, vials containing sorghum and either each species alone or both species were placed at 30 °C and 65% relative humidity. After ten days, all parental adults were removed and the vials were returned to the same conditions. Five weeks later the vials were emptied, to record adult emergence, the percentage of insect damaged kernels (IDK), and frass weight. Our results indicated that progeny production capacity for both species was not affected by the simultaneous presence of R. dominica and S. oryzae, and that adult emergence was more of a variety- mediated parameter. Both species had previously shown similar preferences towards specific sorghum varieties. IDK and frass were higher in vials containing R. dominica alone rather than S. oryzae alone, but these indicators were not always related to progeny production. Specifically, the most and the least frass production was noted on Sumac and PE sorghum varieties for both species, respectively. When the two species were placed together in the same vial, the most frass production was noted in the Non-Waxy Burgundy and Sumac varieties. Our results suggest that varietal resistance in sorghum could be utilized to help reduce post-harvest infestations by S. oryzae and R. dominica.
我们测试了成虫同时侵染高粱粟褐螟（Rhyzopertha dominica（F.））和米象（Sitophilus oryzae（L.））对六种高粱品种的影响。为此，将装有高粱的小瓶分别单独放入每个物种或两种物种，置于 30°C 和 65%相对湿度下。十天后，去除所有亲本成虫，将小瓶放回相同条件下。五周后，清空小瓶，记录成虫的出现、受虫害的麦粒百分比（IDK）和粪便重量。我们的结果表明，两种物种的后代产生能力不受 R. dominica 和 S. oryzae 同时存在的影响，成虫的出现更多地受到品种介导的参数的影响。这两种物种之前都表现出对特定高粱品种的相似偏好。仅含有 R. dominica 的小瓶中的 IDK 和粪便比仅含有 S. oryzae 的小瓶中的高，但这些指标并不总是与后代产生有关。具体来说，对于这两种物种，Sumac 和 PE 高粱品种的粪便产生量最多，而最少的是在 Sumac 和 PE 高粱品种上。当这两种物种同时放在同一个小瓶中时，非蜡质 Burgundy 和 Sumac 品种的粪便产生量最多。我们的结果表明，高粱的品种抗性可以用来帮助减少米象和高粱粟褐螟的收获后侵染。
