Anatomical Parameters of Cowpea, Vigna Unguiculata (L.) Walp. Stem and Pod Wall Resistance to the Legume Pod Borer Maruca testulalis Geyer (Lepidoptera: Pyralidae)

1991 ◽  
Vol 12 (1-2-3) ◽  
pp. 171-176
Author(s):  
S. Oghiakhe ◽  
L. E. N. Jackai ◽  
W. A. Makanjuola
Keyword(s):  
Vigna Unguiculata ◽  
Maruca Testulalis ◽  
Pod Borer ◽  
Legume Pod Borer ◽  
Lepidoptera Pyralidae ◽  
Pod Wall ◽  
Anatomical Parameters

A rapid visual field screening technique for resistance of cowpea (Vigna unguiculata) to the legume pod borer Maruca testulalis (Lepidoptera: Pyralidae)

1992 ◽  
Vol 82 (4) ◽  
pp. 507-512 ◽  
Author(s):  
S. Oghiakhe ◽  
L.E.N. Jackai ◽  
W.A. Makanjuola
Keyword(s):  
Visual Field ◽  
Vigna Unguiculata ◽  
Maruca Testulalis ◽  
Previous Method ◽  
Field Screening ◽  
Screening Technique ◽  
Pod Borer ◽  
Legume Pod Borer ◽  
Visual Technique ◽  
Lepidoptera Pyralidae

AbstractA rapid visual field screening technique for resistance of cowpea (Vigna unguiculata) to the legume pod borer Maruca testulalis (Geyer) was developed. The methodology involved measurement of two damage parameters: field examination of flowers for signs of M. testulalis injury or larval presence (i.e. rapid visual technique - flowers) and/or a pod evaluation index, from the ratio of pod load to pod damage (i.e. rapid visual technique - pods). Highly significant (P <0.01) correlations were obtained between the rapid visual field screening technique and the existing field screening technique. The latter is recommended as a fast and precise method for initial screening large collections of genotypes while the former should be used for more detailed selection and other resistance studies. The technique described here uses fewer variables than the previous method and thereby reduces costs while improving efficiency and precision.

A field screening technique for resistance of cowpea (Vigna unguiculata) to the pod-borer Maruca testulalis (Geyer) (Lepidoptera: Pyralidae)

1982 ◽  
Vol 72 (1) ◽  
pp. 145-156 ◽  
Author(s):  
Louis E. N. Jackai
Keyword(s):  
Vigna Unguiculata ◽  
Plant Resistance ◽  
Resistance Index ◽  
Maruca Testulalis ◽  
Larval Population ◽  
Field Screening ◽  
Seed Damage ◽  
Pod Borer ◽  
Legume Pod Borer ◽  
Lepidoptera Pyralidae

AbstractA method for screening resistance of cowpea (Vigna unguiculata) to the legume pod-borer Maruca testulalis (Geyer) was developed. Several damage parameters were measured, including damage to stem, flowers, pods and seeds. Some of these parameters were assessed in more than one way. A decision was made at the end of the study as to which parameters were most appropriate for a field screening methodology. A plant resistance index, Ipr, was generated to aid in this decision. Based on this, it was concluded that flower, pod, and seed damage measurements provided the most important assessment of resistance to the borer. The larval population in the flowers showed marked differences in infestation levels between cultivars and is suggested as a means of comparing results in the future. Based on the methodology described, TVu 946 was the most resistant cowpea cultivar in every category of assessment. Five other cultivars were also selected for further evaluation as probable resistance donors: Kamboinse Local, TVu 1, VITA-5, TVx 3890–010F and VICAM-1/SP. The rationale behind the development of a field-screening methodology and some of its shortfalls are discussed.

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