Responses of three populations of the seed beetle, Callosobruchus maculatus (F.) (Coleoptera: Bruchidae), to seed resistance in selected varieties of cowpea, Vigna unguiculata (L.) Walp.

1995 ◽  
Vol 31 (1) ◽  
pp. 17-27 ◽  
Author(s):  
T.I. Ofuya ◽  
P.F. Credland
Keyword(s):  
Vigna Unguiculata ◽  
Callosobruchus Maculatus ◽  
Seed Beetle ◽  
Seed Resistance

Inheritance of pod and seed resistance to the cow-pea seed beetle (Callosobruchus maculatus Fabr.)

1987 ◽  
Vol 108 (3) ◽  
pp. 655-660 ◽  
Author(s):  
D. G. Rusoke ◽  
T. Fatunla
Keyword(s):  
Callosobruchus Maculatus ◽  
Susceptible Cultivar ◽  
Seed Beetle ◽  
Land Races ◽  
Land Race ◽  
Cytoplasmic Factors ◽  
Recessive Genes ◽  
Seed Resistance ◽  
Pea Seed

SummaryTwo seed-resistant land races were crossed to a seed-susceptible cultivar to produce Fl, F2, BC1; and BC2 generations. It was observed that seed resistance was conditioned by two unlinked recessive genes and cytoplasmic factors. Similarly, generations derived from a pod-resistant, seed-susceptible cultivar with a seed-resistant, pod-susceptible land race demonstrated that seed and pod resistance are independently inherited.

The inheritance of seed resistance to Callosobruchus maculatus F. in cowpea (Vigna unguiculata L. Walp.). II. Analyses of percentage emergence and emergence periods of bruchids in F4 seed generation of two reciprocal crosses

1983 ◽  
Vol 34 (6) ◽  
pp. 697 ◽  
Author(s):  
R Redden
Keyword(s):  
Vigna Unguiculata ◽  
Callosobruchus Maculatus ◽  
Adult Emergence ◽  
The Other ◽  
Recessive Character ◽  
Reciprocal Crosses ◽  
Bruchid Resistance ◽  
F2 Generation ◽  
Mean Time ◽  
Seed Resistance

Seed from F3 generation plants of two reciprocal crosses were evaluated for bruchid resistance, over 28 F3 families of four plants each plus an additional five plants each in 10-11 families. The variables, percentage adult emergence for a specified period and mean time to emergence, agreed with respect to describing segregation in the resistant, intermediate and susceptible categories. Resistance was expressed as a recessive character. No differences between families from reciprocal crosses were detected. There was evidence for digenic control of resistance in one cross and for monogenic control in the other, in conjunction with one, or more, modifier or minor gene loci. There was general agreement between the results for the F3 generation study and a previous study on the F2 generation.

scholarly journals Estabilidade da resistência de genótipos de caupi a Callosobruchus maculatus (Fabr.) em gerações sucessivas

2002 ◽  
Vol 59 (2) ◽  
pp. 275-280 ◽  
Author(s):  
Marcileyne Pessôa Leite de Lima ◽  
José Vargas de Oliveira ◽  
Reginaldo Barros ◽  
Jorge Braz Torres ◽  
Manoel Eneas de Carvalho Gonçalves
Keyword(s):  
Vigna Unguiculata ◽  
Callosobruchus Maculatus

Callosobruchus maculatus (Fabr.) (Coleoptera: Bruchidae) é a principal praga do caupi (Vigna unguiculata L.) armazenado em condições tropicais e subtropicais. Avaliaram-se a estabilidade da resistência e a capacidade de adaptação de C. maculatus a genótipos de caupi, durante seis gerações. Utilizou-se o teste sem chance de escolha, em delineamento experimental inteiramente casualizado, em esquema fatorial, com dez tratamentos, seis gerações do inseto e cinco repetições. Cada repetição constou de 30 grãos infestados com dois casais da praga. O número de ovos/fêmea diferiu entre os genótipos de caupi apenas na sexta geração, e entre as gerações em BR14-Mulato, Bico de Pato, TE90-180-3E e TE87-98-8G. A viabilidade de ovos diferiu entre as gerações em BR17-Gurguéia, BR14-Mulato, IT89KD-260 e IT89KD-245, e entre os genótipos nas terceira, quinta e sexta gerações. Os genótipos diferiram entre e dentro das gerações, em relação à duração e a viabilidade da fase imatura. Observou-se redução na emergência, especialmente em IT89KD-245, IT89KD-260, CNC 0434, Bico de Pato, TE90-180-10F e BR14-Mulato, provavelmente devido a substâncias químicas presentes nos grãos que afetaram a sobrevivência dos insetos, ao longo das gerações. Os genótipos IT89KD-245 e IT89KD-260 comportaram-se como moderadamente resistentes. Não se observou adaptação de C. maculatus aos genótipos, mantendo-se a resistência estável através das gerações.

scholarly journals Evaluation on the Effect of Sustainable Environmental Friendly Bio-pesticide on the Growth of seed Borne Fungi (Aspergillus niger) on Cowpea (Vigna unguiculata L. Walp.)

2021 ◽  
Vol 4 (2) ◽  
pp. 55-79
Author(s):  
Azawei A. ◽  
Okorodo P.C. ◽  
Blessing E.
Keyword(s):  
Essential Oils ◽  
Vigna Unguiculata ◽  
Niger Delta ◽  
Seed Treatment ◽  
Callosobruchus Maculatus ◽  
Insect Pest ◽  
Soil Science ◽  
Plant Essential Oils ◽  
Environmental Friendly ◽  
Randomized Design

Evaluation on the Effect of Sustainable Environmental Friendly Bio Pesticides Application on the Growth of Seed borne Fungi on Cowpea (Vigna unguiculata L. Walp.) was conducted at the Department of Crop and Soil Science Laboratory, Niger Delta University, Wilberforce Island, Bayelsa State, Nigeria. To determine the percentage (%) efficacy of plant essential oils and to evaluate the best plant essential oil on the suppression of the pathogen cultured and treated Potatoes Dextrose Agar (PDA) plates with the different plant essential oils concentration levels (0.1, 0.01, and 0.001%). This experiment was arranged in Complete Randomized Design (CRD) and each treatment was replicated three times and each replicate contained 12 petri dishes. The result shows that ginger oil at 0.1 in all the days of the bioassay assessment, particularly, from day 6-day10 proved more effective in suppressing the teste pathogen (A. niger), this could be the present of the active ingredient (Zingerone) on the treatment. Therefore, this result should be encouraged for Cowpea farmers as seed treatment before storage to prevent Cowpea weevils (Callosobruchus maculatus) as a grain storage insect pest, that causes serious destruction on the stored grains.

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