Forchibe E E, Fening K O, Vershiyi D T, Cobblah A M, Afreh-Nuamah K
African Regional Postgraduate Programme in Insect Science (ARPPIS), College of Basic and Applied Sciences, University of Ghana, Legon, Accra, Ghana.
Soil and Irrigation Research Centre, School of Agriculture, College of Basic and Applied Sciences, University of Ghana, Accra, Ghana.
Bull Entomol Res. 2023 Jun;113(3):380-388. doi: 10.1017/S0007485323000032. Epub 2023 Mar 10.
(Davis) and (Sulzer) are important pests of brassica crops, causing significant yield losses on cabbage in Ghana. To inform the development of ecologically sound and sustainable pest management strategies for these pests, their biological and population growth parameters were studied on three cabbage varieties (Oxylus, Fortune, and Leadercross). The study was conducted in a screen house under ambient conditions at 30 ± 1°C and 75 ± 5% RH and 12:12 h photoperiod from September to November 2020. The parameters of the preadult developmental period, survival rates, longevity, reproduction, and life table were evaluated following the female age-specific life table. There were significant differences in the nymphal developmental time, longevity, and fecundity on the cabbage varieties for both aphid species. The highest population growth parameters, net reproductive rate (), intrinsic rate of increase , and finite rate of increase (λ) were recorded on Oxylus variety for both and . The lowest was recorded on Leadercross variety for and Fortune for . The results from this study suggest that Leadercross is a less suitable host for and Fortune for , thus, should be considered as less susceptible varieties for use in primary pest management by small-scale farmers or as a component of an integrated pest management strategy for these pests on cabbage.
（戴维斯蚜）和（苏尔泽蚜）是十字花科作物的重要害虫，在加纳导致甘蓝产量大幅损失。为了制定针对这些害虫的生态合理且可持续的害虫管理策略，在三个甘蓝品种（奥克西勒斯、财富和领导者杂交种）上研究了它们的生物学和种群增长参数。该研究于2020年9月至11月在温室中进行，环境条件为30±1°C、相对湿度75±5%以及12:12小时光周期。按照雌虫特定年龄生命表评估了若虫前期发育时期、存活率、寿命、繁殖力和生命表的参数。两种蚜虫在甘蓝品种上的若虫发育时间、寿命和繁殖力均存在显著差异。对于戴维斯蚜和苏尔泽蚜，奥克西勒斯品种上记录到的种群增长参数最高，即净繁殖率（(R_0)）、内禀增长率（(r_m)）和周限增长率（(\lambda)）。对于戴维斯蚜，领导者杂交品种上记录到的最低；对于苏尔泽蚜，财富品种上记录到的最低。本研究结果表明，领导者杂交种对戴维斯蚜而言是不太适宜的寄主，财富品种对苏尔泽蚜而言是不太适宜的寄主，因此，应被视为小规模农户在主要害虫管理中较不易感的品种，或作为甘蓝上这些害虫综合害虫管理策略的一个组成部分。
