Journal ArticleDOI
Life table and population parameters of cowpea aphid, Aphis craccivora Koch (Homoptera: Aphididae) on five cowpea Vigna unguiculata (L. Walp.) varieties
TLDR
IT835-720-20 is a promising variety with useful genetic resource for cowpea breeding programs aimed at developing resistant varieties against A. craccivora, and may suggest that antibiosis is the modality of resistance.Abstract:
The cowpea aphid, Aphis craccivora Koch, is an important pest of cowpea Vigna unguiculata (L. Walp.) in most tropical regions where cowpea is grown. We used life table and population parameters of the cowpea aphids reared on five cowpea varieties to assess the degree of host plant resistance. The five varieties were Blackeye, B005-C, INIA-37, IT835-720-20 and TVX3671-14C-OID. The parameters measured were fecundity, survival, intrinsic rate of natural increase, pre-reproductive period and relative growth rate of cowpea aphids. Our hypothesis was that cowpea varieties resistant to A. craccivora would have significant effects on life table parameters of the aphid when compared to a susceptible variety. Mean fecundity, age-specific fecundity, survival rates, intrinsic rate of natural increase (r
m), pre-reproductive period and relative growth rate differed significantly among varieties. Fecundity, survival, intrinsic rate of natural increase and mean relative growth rate were significantly lower on variety IT835-720-20 compared to susceptible variety Blackeye. The pre-reproductive period was significantly delayed on variety IT835-720-20 compared to other varieties. The adverse effects of variety IT835-720-20 on life table parameters of A. craccivora indicate the presence of host plant resistance. Prolonged pre-reproductive period and reduction in reproductive performance of A. craccivora on variety IT835-720-20 may suggest that antibiosis is the modality of resistance. However, further detailed studies that include determination of biochemical and morphological characteristics that mediate resistance need to be carried out. IT835-720-20 is, therefore, a promising variety with useful genetic resource for cowpea breeding programs aimed at developing resistant varieties against A. craccivora.read more
Citations
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Journal ArticleDOI
Demography and population projection of Myzus persicae (Sulz.) (Hemiptera: Aphididae) on five pepper ( Capsicum annuum L.) cultivars
TL;DR: This study collected data on the development, survival, fecundity, and proportion of apterous and alate forms of green peach aphid reared on five commercial pepper cultivars and compared differences in the population growth rate of M. persicae on different pepper cultivARS.
Journal ArticleDOI
Host plant resistance to insect pests of cowpea (Vigna unguiculata L. Walp.): achievements and future prospects
Abou Togola,Ousmane Boukar,Nouhoun Belko,Siva K. Chamarthi,Christian Fatokun,Manuele Tamò,N. O. Oigiangbe +6 more
TL;DR: The paper discusses the need for advanced investigation on the genetic basis of the plant defense systems and its application to the crop breeding program for developing new improved materials and the overall expectations of developing insect-resistant lines, reducing the input costs of insecticides while also enhancing cowpea productivity in sub-Saharan Africa.
Journal ArticleDOI
Effects of Pepper (Capsicum annuum) Cultivars on the Biology and Life Table Parameters of Myzus persicae (Sulz.) (Hemiptera: Aphididae)
TL;DR: The results pointed Jaen, Almuden, and Raza cultivars as the least suitable host plants, indicating that they were the most resistant to M. persicae among the cultivars the authors tested.
Journal ArticleDOI
Temperature and Development Impacts on Housekeeping Gene Expression in Cowpea Aphid, Aphis craccivora (Hemiptera: Aphidiae).
TL;DR: This study is the first step to establish a standardized qRT-PCR analysis in A. craccivora following the MIQE guideline and lays a foundation for the genomics and functional genomics research in this sap-sucking insect pest with substantial economic impact.
Journal ArticleDOI
New sources of aphids [Aphis craccivora (Koch)] resistance in cowpea germplasm using phenotypic and molecular marker approaches
Lucky O. Omoigui,Lucky O. Omoigui,G. C. Ekeuro,Alpha Y. Kamara,Lateef L. Bello,Michael P. Timko,G. O. Ogunwolu +6 more
TL;DR: Molecular and phenotypic screening revealed that TVu-2876 has a strong resistance tocowpea aphid and should be a good source of resistance gene that can be used in breeding to develop new aphid resistant cowpea cultivars.
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