Genotypic Diversity in the Suitability of Cowpea (Rosales: Leguminosae) Pods and Seeds for Cowpea Weevil (Coleoptera: Bruchidae) Oviposition and Development

Fitzner, Michael; Hagstrum, David W.; Knauft, D. A.; Buhr, K. L.; McLaughlin, John

doi:10.1093/jee/78.4.806

Cited by 18 publications

(4 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In general, egg counts have not been shown to be predictive enough in resistance studies as other variables such as percent adult emergence, TDT, growth (susceptibility) index, and percent loss in weight (Redden & McGuire, 1983;Jackai & Asante, 2003). The suitability of type of cowpea seed for C. maculatus oviposition is known to be influenced by surface area and curvature of the seeds (Avidov, Berlinger & Applebaum, 1965;Nwanze & Horber, 1976;Wasserman, 1981;Fitzner et al, 1985). Mbata (1992) reported that the surface area of cowpea seeds varies among varieties, and the number of eggs laid per seed is positively correlated with the surface area.…”

Section: Discussionmentioning

confidence: 99%

Evaluation of susceptibility of some elite cowpea cultivars to attack by <i>Callosobruchus maculatus</i> (F.) (Coleoptera: Bruchidae)

Asante¹,

Mensah²

2008

Ghana Journal of Agricultural Science

View full text Add to dashboard Cite

Fifteen elite cowpea cultivars were evaluated for their susceptibility to attack and damage by the most destructive storage pest, Callosobruchus maculatus (F.), based on the number of eggs laid, total developmental time, percentage adult emergence, seed weight loss, and growth index. Significantly, more eggs were laid on the seeds of Bengpla, California and Clemson genotypes than on those of the other cultivars. The mean developmental time (days) of C. maculatus ranged from 21.4 days on California 20 to 25.7 days on Sul 518-2 (Marfo tuya), and was significantly different between the cowpea cultivars. Adult emergence was considerably high on Bengpla, California and Clemson genotypes, but low on IT94K-445-2, Melack, and Sul 518-2. Weight loss ranged from 7 to 35.6 per cent and was significantly different between cultivars. The IT94K-445-2, IT98K-279-3 and Valenga cultivars had the least damage whilst California 11, IT87KD-1951 and Bengpla had the highest loss in seed weight. Overall, the susceptibility indices which ranged from 4.8 to 9.4 indicated that IT94K-445-2, Melack, Sul 518-2 and IT98K-279-3 were the least susceptible, whereas Bengpla, California and Clemson were the most susceptible cultivars. Therefore, it is recommended that IT94K-445-2, Sul 518-2, Melack, and IT98K-279-3 that have some degree of resistance to C. maculatus in this study should either be promoted or incorporated into breeding programmes because this will help to considerably reduce storage losses that farmers incur.

show abstract

Section: Discussionmentioning

confidence: 99%

Evaluation of susceptibility of some elite cowpea cultivars to attack by <i>Callosobruchus maculatus</i> (F.) (Coleoptera: Bruchidae)

Asante¹,

Mensah²

2008

Ghana Journal of Agricultural Science

View full text Add to dashboard Cite

show abstract

“…Varietal differences with respect to both ovipositional nonpreference (Fitzner et al, 1985) and adult emergence from infested pods have been reported (Akingbohungbe, 1976;Fatunla and B adura, 1983;Fitzner et al, 1985;IITA Research Highlights, 1980;Owusu-Akyaw, 1987). Akingbohungbe (1976) suggested that podwall thickness may be responsible for reduced adult emergence from resistant pods, whereas Owusu-Akyaw (1987) found that pod resistance was significantly correlated with pod-wall toughness, as measured by a specially designed penetrometer.…”

Section: Introductionmentioning

confidence: 99%

Resistance to the cowpea weevil (Callosobruchus maculatus) larva in pods of cowpea (Vigna unguiculata)

Kitch

Shade

Murdock

1991

Entomologia Exp Applicata

View full text Add to dashboard Cite

Thirty cowpea, Vigna unguiculata (L.) Walpers, cultivars were evaluated as intact pods to determine if any possessed resistance to the cowpea weevil, Callosobruchus maculatus (Fabr.). Pod resistance was measured as pre‐establishment larval mortality (PreM); those larvae dying after egg hatch but before penetrating into the seeds, and as post‐establishment within‐seed mortality (PostM); those larvae dying after penetrating into the seeds. Among the 30 varieties examined, PreM ranged from 57.9% to 99.4% and PostM ranged from 6.7%, to 82.6%. Ten varieties exhibited total intact pod mortality (mortality from egg hatch to adult emergence from the seed) greater than 95%. Physical measurements were made of several pod and seed characteristics to ascertain whether the observed pod resistance was due to seed factors, pod‐wall factors, or to interactions between the pod and seeds. Although resistance to breakage (from handling plus pod dehiscence) is a necessary characteristic for overall pod protection against C. maculatus; other factors are also important. Among the other pod and seed characteristics measured to identify major resistance factors, seed coat thickness was the one most highly correlated with pod resistance. Our results suggest that interactions between pod‐wall and seed coat characteristics play a large role in pod resistance of cowpeas to C. maculatus.

show abstract

“…Suitability of cowpea seed types for C. maculatus oviposition is known to be influenced by surface area and curvature of the seeds, amongst other factors (Avidov et ai, 1965;Nwanze and Horber, 1976;Wasserman, 1981;Fitzner et al, 1985). Thus, the larger surface area provided by the cheek might partly explain its much heavier egg load.…”

Section: Discussionmentioning

confidence: 99%

Callosobruchus maculatus (Fabricius) (Coleoptera: Bruchidae) oviposition behaviour on cowpea seeds

Ofuya

1987

Int. J. Trop. Insect Sci.

View full text Add to dashboard Cite

Egg distribution on cowpea seeds and the influence of seed population on extent of oviposition by Callosobruchus maculatus (F.) were investigated in this study. Majority of the eggs were laid on the cheek of the cowpea seeds. The number of eggs laid by females increased with increase in seed population. The results are discussed in relation to observations on oviposition behaviour of C. maculatus reported by earlier workers.

show abstract

Genotypic Diversity in the Suitability of Cowpea (Rosales: Leguminosae) Pods and Seeds for Cowpea Weevil (Coleoptera: Bruchidae) Oviposition and Development

Cited by 18 publications

References 0 publications

Evaluation of susceptibility of some elite cowpea cultivars to attack by <i>Callosobruchus maculatus</i> (F.) (Coleoptera: Bruchidae)

Evaluation of susceptibility of some elite cowpea cultivars to attack by <i>Callosobruchus maculatus</i> (F.) (Coleoptera: Bruchidae)

Resistance to the cowpea weevil (Callosobruchus maculatus) larva in pods of cowpea (Vigna unguiculata)

Callosobruchus maculatus (Fabricius) (Coleoptera: Bruchidae) oviposition behaviour on cowpea seeds

Contact Info

Product

Resources

About