Antibiosis mechanism of resistance to the legume pod borer, Maruca Testulalis geyer (Lepidoptera: Pyralidae) in Cowpea

1993 ◽  
Vol 14 (03) ◽  
pp. 403-410 ◽  
Author(s):  
S. Oghiakhe ◽  
W.A. Makanjuola ◽  
L.E.N. Jackai
Keyword(s):  
Maruca Testulalis ◽  
Mechanism Of Resistance ◽  
Pod Borer ◽  
Legume Pod Borer ◽  
Lepidoptera Pyralidae

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.

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