Horticulture and Oil Palm Program, National Crops Resources Research Institute, NaCRRI, P.O. Box, 7084, Kampala, Uganda.
Department of Entomology, Iowa State University, Ames, Iowa 50011-1100, USA.
Environ Entomol. 2023 Jun 16;52(3):360-370. doi: 10.1093/ee/nvad020.
The green peach aphid, Myzus persicae (Sulzer) (Hemiptera: Aphididae), is a key insect pest of amaranth in East Africa. Pest management has been restricted to indiscriminate application of insecticides to foliage. Applying systemic insecticides to seeds has been shown to manage aphid infestations in other crop systems. We evaluated two commercially available seed treatments in East Africa, Apron Star (thiamethoxam 20 g/kg + metalaxyl-M 20 g/kg + difenoconazole 2 g/kg) and Menceron (imidacloprid 233 g/L + pencycuron 50 g/L + thiram 107 g/L) for their efficacy against M. persicae and impact on fresh leaf yield with two Amaranthus species, Amaranthus blitum (2 selections), Amaranthus hybridus (4 selections) and untreated control. Two storage periods (24 h and 3 months) with seed treatments were used. Each amaranth selection was treated individually with Apron and Monceren or untreated, and seeds were planted either 24 h or 3 months after treatment. Significant reduction in live aphids was observed with A. blitum and A. hybridus selections grown with seed treatment, at 6, 8 and 10 d after infestation (DAI) when compared with seeds grown without seed treatment. Untreated seeds of A. hybridus (selection 5) had significantly higher number of live aphids up to 243, greater percentage of damaged leaves and leaf damage score up to 84% and 64% respectively when compared with treated seeds of specific amaranth at 10 DAI. No significant difference was noted between seed treatment and storage time. Amaranth seeds treated with Monceren offered more protection against infestations of Myzus persicae than amaranth seeds treated with Apron under high tunnel experiments.
绿桃蚜，桃蚜（苏尔泽）（半翅目：蚜虫科），是东非苋菜的主要害虫。害虫管理一直局限于对叶片进行不分青红皂白的杀虫剂应用。向种子中施用内吸性杀虫剂已被证明可控制其他作物系统中的蚜虫侵染。我们评估了两种在东非市售的种子处理剂，Apron Star（噻虫嗪 20 g/kg + 精甲霜灵 20 g/kg + 咯菌腈 2 g/kg）和 Menceron（吡虫啉 233 g/L + 丙环唑 50 g/L + 代森锰锌 107 g/L）对两种苋菜，苋菜（2 个品种）、苋菜杂种（4 个品种）和未处理对照的桃蚜防治效果及其对鲜叶产量的影响。使用了两种种子处理的两个储存期（24 h 和 3 个月）。每个苋菜品种均单独用 Apron 和 Monceren 或未处理进行处理，处理后 24 h 或 3 个月种植种子。与未用种子处理的种子相比，用种子处理种植的苋菜和苋菜杂种在侵染后 6、8 和 10 天（DAI）时观察到活蚜虫数量显著减少。与特定苋菜的处理种子相比，苋菜杂种（品种 5）的未处理种子在 10 DAI 时具有显著更高数量的活蚜虫（高达 243 头）、更大比例的受损叶片和高达 84%和 64%的叶片损伤评分。种子处理与储存时间之间无显著差异。在温室试验中，用 Monceron 处理的苋菜种子比用 Apron 处理的苋菜种子更能防止桃蚜的侵染。
